Formulated by Science. Verified by Labs. Trusted by Longevity Seekers.

Same Active Form Proven in Clinical Studies
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules

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US orders over $50 and international over $100 

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Peace of mind with our 60-day money-back guarantee.

Free Shipping

US orders over $50 and international over $100 

Money-Back Guarantee

Peace of mind with our 60-day money-back guarantee.

The HealthspanX Standard™
Where Clinical Purity Meets Real-World Results

At HealthspanX, we don’t follow trends — we follow the science. Our Ultra Pure Quercetin™ is pharmaceutical-grade, third-party tested, and verified at over 98% purity — meeting the same standards used in clinical research. No fillers. No gimmicks. Just clean, high-potency quercetin to support your immunity, heart, and cellular health from the inside out. Trusted by professionals. Backed by science. Designed for results.
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules
Ultra Pure Quercetin™ 400mg, 62 Capsules

Ultra Pure Quercetin™ 400mg, 62 Capsules

Based on Verified Customers

Immune strength, inflammation control, and cellular health all decline with age. Ultra Pure Quercetin™ is clinically formulated to support immune resilience, antioxidant defense, and the natural clearing of senescent “zombie” cells that drive aging and inflammation.

Experience stronger immunity, reduced inflammation, and enhanced cellular renewal — all from the inside out. Whether you're supporting longevity or protecting your health year-round, Ultra Pure Quercetin™ is your trusted daily shield.
$31.00
$0.00

Delivery Size - Daily Dosage

The HealthspanX Standard™
Where Clinical Purity Meets Real-World Results

At HealthspanX, we don’t follow trends — we follow the science. Our Ultra Pure Quercetin™ is pharmaceutical-grade, third-party tested, and verified at over 98% purity — meeting the same standards used in clinical research. No fillers. No gimmicks. Just clean, high-potency quercetin to support your immunity, heart, and cellular health from the inside out. Trusted by professionals. Backed by science. Designed for results.

  • Science

  • Formula

  • Usage

  • Lab Testing & Integrity

  • Features

  • FAQ

The Science of Cellular Renewal Begins with Quercetin

Quercetin is a plant-based flavonoid (a natural compound found in colorful fruits and vegetables) found in apples, onions, and capers, long studied for its potent antioxidant (protects cells from damage), anti-inflammatory (helps calm the body’s overactive response that can cause pain or long-term damage), and immune-modulating (helps balance the immune system) effects (Zhou et al., 2023; Cui et al., 2022).

Senolytic Action: Removing Senescent Cells

Quercetin is one of the few natural compounds shown to act as a senolytic (a substance that clears out worn-out “zombie” cells that no longer function properly)—selectively clearing senescent cells (old, damaged cells that build up with age and cause trouble) that accumulate with age and drive inflammation. In human pilot studies, it reduced markers of senescence and improved physical function. By clearing these bad cells, your body can heal better and feel younger. (Hickson et al., 2019; Maurer et al., 2024).

Antioxidant Defense Through NRF2 Activation

Quercetin activates NRF2 (a key protein that turns on your body’s natural protection system), a key regulator of antioxidant genes like SOD, catalase, and glutathione peroxidase (your body’s strongest natural defenses against cell damage), boosting the body's resilience against oxidative damage. It also scavenges reactive oxygen species (ROS) (harmful molecules that damage cells) directly, reducing the burden of DNA damage and slowing cellular aging. Think of it like a natural shield that protects your body from getting rusty inside. (Zhang et al., 2024; Mirsafaei et al., 2020).

Inflammation Reduction via NF-κB Inhibition

Chronic inflammation, or inflammaging (the slow, invisible inflammation that happens as we age), is central to aging-related disease. Quercetin suppresses NF-κB signaling (a key switch that turns on inflammation in the body) and reduces pro-inflammatory cytokines (chemicals that increase swelling and pain) such as IL-6 and TNF-α, helping protect joints, the heart, and other organs. This makes it easier for your body to stay calm and avoid damage from hidden internal stress (Zhou et al., 2023; Mirsafaei et al., 2020).

Mitochondrial Health and Autophagy Support

Quercetin has been shown to enhance mitochondrial biogenesis (helps your cells build more energy factories) and support autophagy (the body’s natural cleaning system for old or damaged parts of cells). This results in better energy production, metabolic efficiency, and protection against age-related mitochondrial decline. That means more energy, better metabolism, and healthier cells overall. (Houghton et al., 2018).

Immune Modulation & Mast Cell Stabilization

Quercetin is a natural mast cell stabilizer (helps calm allergy cells so they don’t release too much histamine), reducing histamine release and allergy-related inflammation. It modulates Th1/Th2 immune balance (keeps your immune system well-balanced so it doesn’t overreact) and enhances innate antiviral defense (your body’s first line of defense against viruses), making it especially beneficial for aging immune systems. In short, it helps your body fight infections while calming allergy symptoms at the same time. (Najafi et al., 2024; Chirumbolo, 2010; Jafarinia et al., 2020; Zou et al., 2024).

Brain Health & Neuroprotection

Because Quercetin crosses the blood-brain barrier (can enter the brain to work directly inside it), it helps reduce neuroinflammation (brain swelling) and oxidative stress in brain tissue. Animal studies and early human data suggest improved memory, focus, and cognitive aging outcomes. That means it may help your brain stay sharp, focused, and protected as you age. (Suganthy et al., 2016; Ishisaka et al., 2014; Budamagunta et al., 2023; Krzystyniak et al., 2022).

Cardiovascular & Metabolic Benefits

Quercetin improves endothelial function (helps blood vessels expand and relax), reduces arterial stiffness (keeps your arteries flexible), and lowers blood pressure in clinical trials. It also improves insulin sensitivity (helps your body use sugar more effectively) and glucose control, mimicking some effects of caloric restriction (a diet method shown to slow aging in studies) and helping regulate metabolic health. In plain terms, it supports your heart, helps with blood sugar, and keeps your body running smoothly. (Yamagata, 2023; Koutsaliaris et al., 2021).

Gut and Digestive Health

Quercetin may protect the intestinal lining (the protective wall inside your gut) and reduce inflammation in the gut, supporting barrier integrity (keeps harmful stuff out and nutrients in) and microbiome balance (a healthy mix of good bacteria). These effects are particularly relevant for older adults prone to leaky gut (when the gut becomes too porous) and immune dysregulation. This helps with digestion, bloating, and gut-related immune problems. (Zhou et al., 2023). 

Clinically Proven Safety with Ultra Pure Quercetin™

Quercetin has been studied in over 100 human clinical trials and is generally safe at doses of 500–1000mg daily. Our Quercetin is ultra-pure, third-party tested, and formulated for safety, consistency, and real-world performance—without fillers, contaminants, or misleading claims. It’s the same high-quality quercetin used in research—pure, safe, and trusted.

Why Purity Matters in the Formula

Every clinical study that demonstrated the effectiveness of quercetin used it in its pure form — not in blends, not with fillers, and not diluted in proprietary formulas. That’s why Ultra Pure Quercetin™ contains only pharmaceutical-grade quercetin aglycone at over 98% purity.

Other brands often mix quercetin with low-cost ingredients or use lower purity raw materials to reduce costs — but this compromises both absorption and results. We don’t cut corners. We match the exact form, dose, and purity level used in published human studies, so you get real, research-backed benefits — not marketing experiments.

Why Capsules Still Lead the Way in Quercetin Delivery

With powders, liquids, liposomal blends, and sprays flooding the market, why do we still choose Ultra Pure Quercetin™ in capsule form?

Because capsules remain the most stable, protective, and clinically relevant method to deliver quercetin effectively—especially the potent aglycone form that offers the broadest biological activity.

Protection from Breakdown in the Gut

Quercetin is highly sensitive to oxidation, moisture, and digestive degradation (Malacaria et al., 2022; CHANG et al., 2021; Fu et al., 2023). Encapsulation protects it from gastric acid and allows targeted release in the small intestine—the primary site of absorption (Zhu et al., 2024; Pinheiro et al., 2021).

Designed for Targeted Absorption

Absorption occurs mainly in the small intestine via passive diffusion and active transport after deglycosylation (Murota & Terao, 2003). Capsules help maintain compound integrity during transit, increasing the chances of uptake at the absorption site (Singhal et al., 2011).

Low Bioavailability—But Smart Delivery Helps

Due to poor water solubility, extensive first-pass metabolism, and rapid clearance, free quercetin has low systemic availability (Li et al., 2024; Attar et al., 2023). However, encapsulated quercetin—especially in lipid-based or enteric forms—has shown significant improvements in bioavailability and biological effects (Zhao et al., 2021).

Precision Dosing Backed by Research

Each Ultra Pure Quercetin™ capsule delivers 400mg of pure quercetin aglycone—ensuring precise, reproducible dosing critical for consistency and clinical relevance (You et al., 2020; Hai et al., 2020). This contrasts with liquids and powders, which suffer from variable intake and faster degradation (Doneva & Bauer, 2021; Shimoi et al., 2003).

Convenience That Preserves Potency

Capsules guard against degradation by blocking exposure to light, moisture, and oxidation—factors that destabilize non-capsulated forms. They also offer longer shelf life and better portability than liposomal liquids or open powders.

Used in Human Clinical Trials

Capsule-based quercetin has been widely used in clinical studies assessing its effects on immunity, blood pressure, and inflammation, often showing measurable outcomes (Mirsafaei et al., 2020; Aucoin et al., 2020; Heinz et al., 2010). While some newer delivery systems are under study, capsules remain the benchmark in peer-reviewed human trials (PIERRO et al., 2021; Egert et al., 2011).

No Hype—Just Smart, Evidence-Based Formulation

While trendy delivery systems like liposomal sprays or nano-emulsions may sound innovative, they’re often under-tested and over-hyped. We stick to what works: a high-purity, properly dosed capsule supported by robust science and real human outcomes.

Recommended Daily Dosage

Take 2 capsules (800mg total) once daily with a source of fat or as directed by your healthcare practitioner.
This dosage reflects amounts used in human clinical studies and supports cardiovascular, immune, and cognitive health.

When to Take It

Take Ultra Pure Quercetin™ in the morning with food.
Fat-containing meals enhance absorption of quercetin, and morning intake aligns with its modulation of inflammation and oxidative stress pathways that follow a circadian rhythm.

How Long to Take It

Use daily and consistently. Most users begin to notice improvements in allergy symptoms, inflammation, or energy levels within 2–4 weeks. Stronger clinical outcomes—including vascular, metabolic, and immune benefits—are typically observed after 8 to 12 weeks of sustained use.

Scientifically Aligned

This usage protocol is based on peer-reviewed clinical research showing that quercetin can:

  • Reduce inflammatory cytokines and oxidative stress markers in humans. 
  • Support endothelial function and blood pressure regulation. 
  • Modulate immune responses and histamine release. 
  • Improve exercise performance and allergy-related symptoms. 

These benefits are supported by studies using encapsulated quercetin in humans (Mirsafaei et al., 2020; Aucoin et al., 2020).

Lab Verified. Clinically Trusted. 100% Transparent.

At HealthspanX, we don’t just promise purity—we prove it. Every batch of Ultra Pure Quercetin™ is rigorously tested by an independent U.S. laboratory to verify identity, potency, and safety. You get real results, backed by real science.

Identity & Potency Confirmed by UPLC-DAD

Each capsule contains 400mg of pure quercetin aglycone, validated using Ultra Performance Liquid Chromatography with Diode Array Detection (UPLC-DAD)—a pharmaceutical-grade standard for ingredient verification.

Tested Purity: Over 98% (meets USP specification of >95%)

Heavy Metal Testing (USP 233 Protocol)

Every batch is screened for heavy metal contamination using validated USP (United States Pharmacopeia) 233 methods, detecting elemental impurities. Our results fall well below safety thresholds:

  • Arsenic (As): ND (<1 ppm limit)
  • Cadmium (Cd): ND (<1 ppm limit)
  • Lead (Pb): ND (<3 ppm limit)
  • Mercury (Hg): ND (<0.1 ppm limit)

(ND = Not Detected above 0.006 ppm LOD)

Microbial Screening (USP 2021 & 2022 Standards)

We test for microbial contamination in accordance with pharmaceutical-grade guidelines.

  • Total Aerobic Plate Count: 50 CFU/g (spec: <1000 CFU/g)
  • Yeast & Mold: <100 CFU/g
  • Total Coliform: <10 CFU/g
  • E. coli, Salmonella, Staphylococcus aureus: Absent

Third-Party Lab Integrity You Can Trust

All testing is conducted by Twin Arbor Analytical—a U.S.-based ISO/IEC 17025-accredited laboratory.
This guarantees:

  • Independent verification of every batch
  • Globally recognized testing standards
  • Full traceability from raw material to finished capsule

Beware of Low-Grade Quercetin: Choose Clinical-Grade Purity

Many brands use generic powders or poorly absorbed forms. Ultra Pure Quercetin™ is tested at the clinical-grade level for purity, potency, and bioavailability. When you want results you can feel—and science you can verify—only the highest standard will do.

Purity: Over 98% Clinical-Grade Quercetin

Tested using UPLC-DAD and verified by Twin Arbor Analytical — an ISO/IEC 17025-accredited U.S. lab. Every batch exceeds USP standards for identity and potency.

Dose: 800mg Quercetin Per Daily Serving

Each daily serving (2 capsules) delivers 800mg of quercetin aglycone — the form backed by human studies for immune, cardiovascular, and metabolic support.

Capsules Per Pack: 62 Clean Capsules

One full month of high-potency, pharmaceutical-grade quercetin. Easy-to-swallow, plant-based capsules with no fillers, solvents, or artificial ingredients.

Safety Tested: U.S. Lab-Screened for Heavy Metals & Microbes

Each batch is tested for arsenic, cadmium, lead, and mercury — all non-detectable. Also screened for yeast, mold, E. coli, Salmonella, and Staphylococcus under USP protocols.

Vegan & Allergen-Free Formula

Free from dairy, eggs, soy, gluten, added fillers, solvents, and synthetic chemicals. 100% vegan and suitable for sensitive individuals.

3rd-Party Verified Quality

Independently verified for identity, purity, and potency — with full Certificate of Analysis available for every batch.

Eco-Conscious Packaging

Delivered in a resealable, recyclable pouch instead of a bulky plastic bottle. Less waste, more space, and a cleaner footprint.

Made to Exacting Standards

Manufactured in facilities that follow GMP, ISO 9001, and HACCP standards. Every capsule reflects our commitment to clean science, clinical-grade ingredients, and transparent sourcing.

What Is Quercetin and How Does It Work?

Quercetin is a plant-based flavonoid found in onions, apples, and capers. It supports healthy aging by acting as a powerful antioxidant, modulating inflammation, and helping the immune system respond to stress. It also functions as a senolytic — helping clear “zombie” cells that drive aging and inflammation.

How Should I Take Ultra Pure Quercetin™?

Take 2 capsules (400mg each) once daily, ideally with a meal that includes healthy fats like olive oil, avocado, or nuts. Fat significantly improves absorption. For best results, take it in the morning to align with the body’s circadian rhythm and immune activity.

What Is the Right Dosage for Me?

Most human studies use between 500mg and 1000mg of quercetin daily. Ultra Pure Quercetin™ provides 800mg — the sweet spot used in trials examining inflammation, immunity, cardiovascular function, and allergy symptoms.

When Will I Notice Results?

Many users feel noticeable benefits — like reduced allergy symptoms, clearer breathing, or improved energy — within 2–4 weeks. Longer-term results such as cardiovascular and metabolic improvements tend to appear after 8–12 weeks of consistent use.

Is Ultra Pure Quercetin™ Safe to Take with Other Supplements or Medications?

Quercetin is generally well-tolerated, but it can interact with certain medications or supplements. Research indicates quercetin may:

  • Affect blood thinners (e.g., warfarin) by influencing clotting pathways
  • Inhibit liver enzymes (e.g., CYP3A4), altering drug metabolism
  • Enhance or suppress effects of other antioxidants or bioactive herbs

Always consult your healthcare provider if you're taking medications or complex supplement stacks before starting quercetin.

Is Ultra Pure Quercetin™ Safe During Pregnancy or Breastfeeding?

Quercetin has shown immune and antioxidant benefits in preclinical research, but due to limited human safety data during pregnancy and lactation, Ultra Pure Quercetin™ is not currently recommended unless advised by your healthcare provider.

Can Children Take Quercetin?

Ultra Pure Quercetin™ is formulated for adults. If you’re considering it for a child, consult a qualified pediatric healthcare provider first.

Is Ultra Pure Quercetin™ Vegan and Allergen-Free?

Yes. The formula is 100% vegan and free from dairy, gluten, soy, eggs, and artificial additives. It’s also non-GMO and contains no solvents, binders, or preservatives.

How Is the Purity of Ultra Pure Quercetin™ Verified?

Each batch is tested using UPLC-DAD by Twin Arbor Analytical, an ISO/IEC 17025-accredited lab. Our latest batch tested at 98.9% purity and passed all USP standards for safety, identity, and quality.

Does Ultra Pure Quercetin™ Contain Fillers or Additives?

No. It contains only pure quercetin aglycone and a plant-based cellulose capsule. No excipients, no binders, no synthetics — just clinical-grade active ingredient.

Do You Offer a Subscription Option?

Yes. Our flexible subscription lets you save 15% and receive your Ultra Pure Quercetin™ every two months. You can skip, pause, or cancel anytime — ensuring you're always covered without hassle.

Science

The Science of Cellular Renewal Begins with Quercetin

Quercetin is a plant-based flavonoid (a natural compound found in colorful fruits and vegetables) found in apples, onions, and capers, long studied for its potent antioxidant (protects cells from damage), anti-inflammatory (helps calm the body’s overactive response that can cause pain or long-term damage), and immune-modulating (helps balance the immune system) effects (Zhou et al., 2023; Cui et al., 2022).

Senolytic Action: Removing Senescent Cells

Quercetin is one of the few natural compounds shown to act as a senolytic (a substance that clears out worn-out “zombie” cells that no longer function properly)—selectively clearing senescent cells (old, damaged cells that build up with age and cause trouble) that accumulate with age and drive inflammation. In human pilot studies, it reduced markers of senescence and improved physical function. By clearing these bad cells, your body can heal better and feel younger. (Hickson et al., 2019; Maurer et al., 2024).

Antioxidant Defense Through NRF2 Activation

Quercetin activates NRF2 (a key protein that turns on your body’s natural protection system), a key regulator of antioxidant genes like SOD, catalase, and glutathione peroxidase (your body’s strongest natural defenses against cell damage), boosting the body's resilience against oxidative damage. It also scavenges reactive oxygen species (ROS) (harmful molecules that damage cells) directly, reducing the burden of DNA damage and slowing cellular aging. Think of it like a natural shield that protects your body from getting rusty inside. (Zhang et al., 2024; Mirsafaei et al., 2020).

Inflammation Reduction via NF-κB Inhibition

Chronic inflammation, or inflammaging (the slow, invisible inflammation that happens as we age), is central to aging-related disease. Quercetin suppresses NF-κB signaling (a key switch that turns on inflammation in the body) and reduces pro-inflammatory cytokines (chemicals that increase swelling and pain) such as IL-6 and TNF-α, helping protect joints, the heart, and other organs. This makes it easier for your body to stay calm and avoid damage from hidden internal stress (Zhou et al., 2023; Mirsafaei et al., 2020).

Mitochondrial Health and Autophagy Support

Quercetin has been shown to enhance mitochondrial biogenesis (helps your cells build more energy factories) and support autophagy (the body’s natural cleaning system for old or damaged parts of cells). This results in better energy production, metabolic efficiency, and protection against age-related mitochondrial decline. That means more energy, better metabolism, and healthier cells overall. (Houghton et al., 2018).

Immune Modulation & Mast Cell Stabilization

Quercetin is a natural mast cell stabilizer (helps calm allergy cells so they don’t release too much histamine), reducing histamine release and allergy-related inflammation. It modulates Th1/Th2 immune balance (keeps your immune system well-balanced so it doesn’t overreact) and enhances innate antiviral defense (your body’s first line of defense against viruses), making it especially beneficial for aging immune systems. In short, it helps your body fight infections while calming allergy symptoms at the same time. (Najafi et al., 2024; Chirumbolo, 2010; Jafarinia et al., 2020; Zou et al., 2024).

Brain Health & Neuroprotection

Because Quercetin crosses the blood-brain barrier (can enter the brain to work directly inside it), it helps reduce neuroinflammation (brain swelling) and oxidative stress in brain tissue. Animal studies and early human data suggest improved memory, focus, and cognitive aging outcomes. That means it may help your brain stay sharp, focused, and protected as you age. (Suganthy et al., 2016; Ishisaka et al., 2014; Budamagunta et al., 2023; Krzystyniak et al., 2022).

Cardiovascular & Metabolic Benefits

Quercetin improves endothelial function (helps blood vessels expand and relax), reduces arterial stiffness (keeps your arteries flexible), and lowers blood pressure in clinical trials. It also improves insulin sensitivity (helps your body use sugar more effectively) and glucose control, mimicking some effects of caloric restriction (a diet method shown to slow aging in studies) and helping regulate metabolic health. In plain terms, it supports your heart, helps with blood sugar, and keeps your body running smoothly. (Yamagata, 2023; Koutsaliaris et al., 2021).

Gut and Digestive Health

Quercetin may protect the intestinal lining (the protective wall inside your gut) and reduce inflammation in the gut, supporting barrier integrity (keeps harmful stuff out and nutrients in) and microbiome balance (a healthy mix of good bacteria). These effects are particularly relevant for older adults prone to leaky gut (when the gut becomes too porous) and immune dysregulation. This helps with digestion, bloating, and gut-related immune problems. (Zhou et al., 2023). 

Clinically Proven Safety with Ultra Pure Quercetin™

Quercetin has been studied in over 100 human clinical trials and is generally safe at doses of 500–1000mg daily. Our Quercetin is ultra-pure, third-party tested, and formulated for safety, consistency, and real-world performance—without fillers, contaminants, or misleading claims. It’s the same high-quality quercetin used in research—pure, safe, and trusted.

Formula

Why Purity Matters in the Formula

Every clinical study that demonstrated the effectiveness of quercetin used it in its pure form — not in blends, not with fillers, and not diluted in proprietary formulas. That’s why Ultra Pure Quercetin™ contains only pharmaceutical-grade quercetin aglycone at over 98% purity.

Other brands often mix quercetin with low-cost ingredients or use lower purity raw materials to reduce costs — but this compromises both absorption and results. We don’t cut corners. We match the exact form, dose, and purity level used in published human studies, so you get real, research-backed benefits — not marketing experiments.

Why Capsules Still Lead the Way in Quercetin Delivery

With powders, liquids, liposomal blends, and sprays flooding the market, why do we still choose Ultra Pure Quercetin™ in capsule form?

Because capsules remain the most stable, protective, and clinically relevant method to deliver quercetin effectively—especially the potent aglycone form that offers the broadest biological activity.

Protection from Breakdown in the Gut

Quercetin is highly sensitive to oxidation, moisture, and digestive degradation (Malacaria et al., 2022; CHANG et al., 2021; Fu et al., 2023). Encapsulation protects it from gastric acid and allows targeted release in the small intestine—the primary site of absorption (Zhu et al., 2024; Pinheiro et al., 2021).

Designed for Targeted Absorption

Absorption occurs mainly in the small intestine via passive diffusion and active transport after deglycosylation (Murota & Terao, 2003). Capsules help maintain compound integrity during transit, increasing the chances of uptake at the absorption site (Singhal et al., 2011).

Low Bioavailability—But Smart Delivery Helps

Due to poor water solubility, extensive first-pass metabolism, and rapid clearance, free quercetin has low systemic availability (Li et al., 2024; Attar et al., 2023). However, encapsulated quercetin—especially in lipid-based or enteric forms—has shown significant improvements in bioavailability and biological effects (Zhao et al., 2021).

Precision Dosing Backed by Research

Each Ultra Pure Quercetin™ capsule delivers 400mg of pure quercetin aglycone—ensuring precise, reproducible dosing critical for consistency and clinical relevance (You et al., 2020; Hai et al., 2020). This contrasts with liquids and powders, which suffer from variable intake and faster degradation (Doneva & Bauer, 2021; Shimoi et al., 2003).

Convenience That Preserves Potency

Capsules guard against degradation by blocking exposure to light, moisture, and oxidation—factors that destabilize non-capsulated forms. They also offer longer shelf life and better portability than liposomal liquids or open powders.

Used in Human Clinical Trials

Capsule-based quercetin has been widely used in clinical studies assessing its effects on immunity, blood pressure, and inflammation, often showing measurable outcomes (Mirsafaei et al., 2020; Aucoin et al., 2020; Heinz et al., 2010). While some newer delivery systems are under study, capsules remain the benchmark in peer-reviewed human trials (PIERRO et al., 2021; Egert et al., 2011).

No Hype—Just Smart, Evidence-Based Formulation

While trendy delivery systems like liposomal sprays or nano-emulsions may sound innovative, they’re often under-tested and over-hyped. We stick to what works: a high-purity, properly dosed capsule supported by robust science and real human outcomes.

Usage

Recommended Daily Dosage

Take 2 capsules (800mg total) once daily with a source of fat or as directed by your healthcare practitioner.
This dosage reflects amounts used in human clinical studies and supports cardiovascular, immune, and cognitive health.

When to Take It

Take Ultra Pure Quercetin™ in the morning with food.
Fat-containing meals enhance absorption of quercetin, and morning intake aligns with its modulation of inflammation and oxidative stress pathways that follow a circadian rhythm.

How Long to Take It

Use daily and consistently. Most users begin to notice improvements in allergy symptoms, inflammation, or energy levels within 2–4 weeks. Stronger clinical outcomes—including vascular, metabolic, and immune benefits—are typically observed after 8 to 12 weeks of sustained use.

Scientifically Aligned

This usage protocol is based on peer-reviewed clinical research showing that quercetin can:

  • Reduce inflammatory cytokines and oxidative stress markers in humans. 
  • Support endothelial function and blood pressure regulation. 
  • Modulate immune responses and histamine release. 
  • Improve exercise performance and allergy-related symptoms. 

These benefits are supported by studies using encapsulated quercetin in humans (Mirsafaei et al., 2020; Aucoin et al., 2020).

Lab Testing & Integrity

Lab Verified. Clinically Trusted. 100% Transparent.

At HealthspanX, we don’t just promise purity—we prove it. Every batch of Ultra Pure Quercetin™ is rigorously tested by an independent U.S. laboratory to verify identity, potency, and safety. You get real results, backed by real science.

Identity & Potency Confirmed by UPLC-DAD

Each capsule contains 400mg of pure quercetin aglycone, validated using Ultra Performance Liquid Chromatography with Diode Array Detection (UPLC-DAD)—a pharmaceutical-grade standard for ingredient verification.

  • Tested Purity: Over 98% (meets USP specification of >95%)
  • Batch ID: HPSG231002

Heavy Metal Testing (USP 233 Protocol)

Every batch is screened for heavy metal contamination using validated USP 233 methods. Our results fall well below safety thresholds:

  • Arsenic (As): ND (<1 ppm limit)
  • Cadmium (Cd): ND (<1 ppm limit)
  • Lead (Pb): ND (<3 ppm limit)
  • Mercury (Hg): ND (<0.1 ppm limit)

(ND = Not Detected above 0.006 ppm LOD)

Microbial Screening (USP 2021 & 2022 Standards)

We test for microbial contamination in accordance with pharmaceutical-grade guidelines.

  • Total Aerobic Plate Count: 50 CFU/g (spec: <1000 CFU/g)
  • Yeast & Mold: <100 CFU/g
  • Total Coliform: <10 CFU/g
  • E. coli, Salmonella, Staphylococcus aureus: Absent

Third-Party Lab Integrity You Can Trust

All testing is conducted by Twin Arbor Analytical—a U.S.-based ISO/IEC 17025-accredited laboratory.
This guarantees:

  • Independent verification of every batch
  • Globally recognized testing standards
  • Full traceability from raw material to finished capsule

Beware of Low-Grade Quercetin: Choose Clinical-Grade Purity

Many brands use generic powders or poorly absorbed forms. Ultra Pure Quercetin™ is tested at the clinical-grade level for purity, potency, and bioavailability. When you want results you can feel—and science you can verify—only the highest standard will do.

Features

Purity: Over 98% Clinical-Grade Quercetin

Tested using UPLC-DAD and verified by Twin Arbor Analytical — an ISO/IEC 17025-accredited U.S. lab. Every batch exceeds USP standards for identity and potency.

Dose: 800mg Quercetin Per Daily Serving

Each daily serving (2 capsules) delivers 800mg of quercetin aglycone — the form backed by human studies for immune, cardiovascular, and metabolic support.

Capsules Per Pack: 62 Clean Capsules

One full month of high-potency, pharmaceutical-grade quercetin. Easy-to-swallow, plant-based capsules with no fillers, solvents, or artificial ingredients.

Safety Tested: U.S. Lab-Screened for Heavy Metals & Microbes

Each batch is tested for arsenic, cadmium, lead, and mercury — all non-detectable. Also screened for yeast, mold, E. coli, Salmonella, and Staphylococcus under USP protocols.

Vegan & Allergen-Free Formula

Free from dairy, eggs, soy, gluten, added fillers, solvents, and synthetic chemicals. 100% vegan and suitable for sensitive individuals.

3rd-Party Verified Quality

Independently verified for identity, purity, and potency — with full Certificate of Analysis available for every batch.

Eco-Conscious Packaging

Delivered in a resealable, recyclable pouch instead of a bulky plastic bottle. Less waste, more space, and a cleaner footprint.

Made to Exacting Standards

Manufactured in facilities that follow GMP, ISO 9001, and HACCP standards. Every capsule reflects our commitment to clean science, clinical-grade ingredients, and transparent sourcing.

FAQ

What Is Quercetin and How Does It Work?

Quercetin is a plant-based flavonoid found in onions, apples, and capers. It supports healthy aging by acting as a powerful antioxidant, modulating inflammation, and helping the immune system respond to stress. It also functions as a senolytic — helping clear “zombie” cells that drive aging and inflammation.

How Should I Take Ultra Pure Quercetin™?

Take 2 capsules (400mg each) once daily, ideally with a meal that includes healthy fats like olive oil, avocado, or nuts. Fat significantly improves absorption. For best results, take it in the morning to align with the body’s circadian rhythm and immune activity.

What Is the Right Dosage for Me?

Most human studies use between 500mg and 1000mg of quercetin daily. Ultra Pure Quercetin™ provides 800mg — the sweet spot used in trials examining inflammation, immunity, cardiovascular function, and allergy symptoms.

When Will I Notice Results?

Many users feel noticeable benefits — like reduced allergy symptoms, clearer breathing, or improved energy — within 2–4 weeks. Longer-term results such as cardiovascular and metabolic improvements tend to appear after 8–12 weeks of consistent use.

Is Ultra Pure Quercetin™ Safe to Take with Other Supplements or Medications?

Quercetin is generally well-tolerated, but it can interact with certain medications or supplements. Research indicates quercetin may:

  • Affect blood thinners (e.g., warfarin) by influencing clotting pathways
  • Inhibit liver enzymes (e.g., CYP3A4), altering drug metabolism
  • Enhance or suppress effects of other antioxidants or bioactive herbs

Always consult your healthcare provider if you're taking medications or complex supplement stacks before starting quercetin.

Is Ultra Pure Quercetin™ Safe During Pregnancy or Breastfeeding?

Quercetin has shown immune and antioxidant benefits in preclinical research, but due to limited human safety data during pregnancy and lactation, Ultra Pure Quercetin™ is not currently recommended unless advised by your healthcare provider.

Can Children Take Quercetin?

Ultra Pure Quercetin™ is formulated for adults. If you’re considering it for a child, consult a qualified pediatric healthcare provider first.

Is Ultra Pure Quercetin™ Vegan and Allergen-Free?

Yes. The formula is 100% vegan and free from dairy, gluten, soy, eggs, and artificial additives. It’s also non-GMO and contains no solvents, binders, or preservatives.

How Is the Purity of Ultra Pure Quercetin™ Verified?

Each batch is tested using UPLC-DAD by Twin Arbor Analytical, an ISO/IEC 17025-accredited lab. Our latest batch tested at 98.9% purity and passed all USP standards for safety, identity, and quality.

Does Ultra Pure Quercetin™ Contain Fillers or Additives?

No. It contains only pure quercetin aglycone and a plant-based cellulose capsule. No excipients, no binders, no synthetics — just clinical-grade active ingredient.

Do You Offer a Subscription Option?

Yes. Our flexible subscription lets you save 15% and receive your Ultra Pure Quercetin™ every two months. You can skip, pause, or cancel anytime — ensuring you're always covered without hassle.

Feel The Difference In Just Weeks — Support Immunity, Inflammation, And Cellular Renewal

Ultra Pure Quercetin™ supports healthy aging by helping your body neutralize oxidative stress, clear senescent cells, and regulate immune and inflammatory responses. Within weeks, users often report noticeable improvements in immune resilience, respiratory health, and overall vitality.

Immune Support

Support year-round immune function and upper respiratory health. Quercetin helps regulate histamine levels and modulates immune pathways — supporting your body’s natural defense system during times of stress.

Cognitive Support

Quercetin crosses the blood-brain barrier and helps reduce neuroinflammation. Clinical research shows it may support memory, mental clarity, and long-term brain health.

Inflammation Control

Quercetin is one of the few natural senolytics — helping clear senescent “zombie” cells that fuel chronic inflammation. This helps calm the body’s inflammatory load from the inside out.

Skin Health

Combat oxidative skin damage and support a clearer, more youthful complexion. Quercetin protects skin cells from environmental stressors and promotes collagen stability and cellular renewal.

Cellular Longevity

Support healthy aging at the cellular level. Quercetin activates pathways linked to DNA repair, immune modulation, and metabolic balance — helping your body age more gracefully.

These are just a few of the powerful effects. In our Quercetin science section, you’ll discover even more clinically studied benefits — including cardiovascular health, gut support, antioxidant defense, and senolytic activity. See how Quercetin supports your body from the inside out.

99% Customers Are Satisfied

What Verified Customers Are Saying About Ultra Pure Quercetin™

My Allergies Are Finally Under Control — And I’m Sleeping Better Too

I’ve struggled with seasonal allergies for years, and nothing ever really worked. After taking Ultra Pure Quercetin™ for a few weeks, my sinuses are clearer, and I’m not waking up congested anymore. Game changer.

Karen L.

  • Verified Buyer

Less Joint Pain, More Energy — I Feel Like Myself Again

I started using Ultra Pure Quercetin™ to help with joint inflammation, and the results blew me away. My knees feel smoother, I’m walking more, and my energy is back. This is the first supplement that’s actually made a real difference.

Mark J.

  • Verified Buyer

Clearer Skin and a Stronger Immune System

I originally bought this for immunity during flu season, but I noticed my skin started looking clearer and more even too. I haven’t been sick once since I started taking it. Also, I feel more energetic throughout my day. Definitely ordering again.

Jenna P.

  • Verified Buyer

Complete Your NAD+ Support Regimen

Pair Ultra Pure Quercetin™ With Ultra Pure NMN™ & Ultra Pure Resveratrol™

Ultra Pure Quercetin™ is a powerful senolytic that clears aging cells, supports immune resilience, and enhances your body’s ability to respond to oxidative stress. Ultra Pure Resveratrol™ activates longevity pathways like SIRT1, improving mitochondrial function and protecting cells from inflammation. Ultra Pure NMN™ elevates NAD+ — the essential molecule for energy production, DNA repair, and cellular metabolism. This trio works synergistically to restore vitality at the cellular level and promote healthy aging from the inside out.

HealthspanX 60-Day Confidence Guarantee

We stand behind Ultra Pure Quercetin™ with a no-hassle 60-day money-back guarantee. If you're not satisfied for any reason, we’ll make it right—quickly and easily through our Return Portal.

Why so confident? Because our Quercetin is the same pharmaceutical-grade compound used in human clinical trials—tested, verified, and trusted. For more information, please check our Return and Refund Policy.

Why Choose HealthspanX?

Where Clinical-Grade Purity Meets Purpose

HealthspanX was founded by a visionary whose life was transformed by the science of NAD+ restoration. What began as a personal breakthrough became a mission to bring clarity, credibility, and clinical-grade solutions to those serious about aging well.

 

We don’t chase trends—we deliver evidence. Our Ultra Pure Quercetin™ is the same pharmaceutical-grade ingredient used in human clinical trials, verified for over 98%+ purity and tested by third-party U.S. labs. Every formula is backed by research, not marketing.

 

At HealthspanX, we translate complex longevity science into real-world results—without the hype, the guesswork, or the waste. Because longevity isn’t a trend. It’s your future, and we’re here to help you protect it.

Have a Question or Need Support? 

The HealthspanX team is ready to help with fast, personalized assistance.
📩 Email us anytime at support@healthspanx.org — we typically respond within 24 hours.

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