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Narrative review

Nicotinamide mononucleotide (NMN) as an anti-aging health product – Promises and safety concerns

Harshani Nadeeshani, Jinyao Li, Tianlei Ying, Baohong Zhang, Jun Lu

Journal of Advanced Research · 2022 · 37:267–278

Original publication PubMed Full text on PMC

Study at a glance

Design
Narrative review of preclinical and early human NMN literature
Population or model
No direct participants; underlying evidence included cell, animal, toxicology, and limited human studies
Sample size
Not applicable to the review
Intervention
No original intervention; reviewed heterogeneous NMN formulations, routes, doses, and durations
Publication type
Narrative review
Evidence class
review-perspective
Research area
Anti-aging claims and safety
Trial registration
Not applicable (narrative review)

Study endpoints

  • NAD+ biology and proposed anti-aging mechanisms
  • Preclinical disease-model and physiological findings
  • Human clinical evidence available at the review date
  • Toxicology and safety concerns
  • Commercial-market and regulatory concerns

Plain-language summary

This narrative review described a broad set of positive cell and animal findings related to NMN and NAD+ biology, while emphasizing that human clinical evidence and long-term safety data were sparse at the time. It warned that commercial anti-aging products were being marketed ahead of rigorous evidence, argued that NMN should not be treated as a panacea, and called for carefully designed human toxicology, safety, and efficacy studies.

Key findings

  • The review presented NMN as an NAD+ precursor with extensive positive findings in cell and animal models.
  • Human efficacy and long-term safety evidence was described as scarce at the review date.
  • The authors stated that recommended safe levels for long-term human administration had not been established.
  • The review discussed context-specific concerns, including axon injury models and possible risks of unnecessary long-term NAD+ upregulation.
  • The authors called for rigorous clinical investigation before broad anti-aging or longevity claims are made.

Limitations

  • Narrative review without a stated systematic-review protocol, risk-of-bias assessment, or meta-analysis.
  • The review was completed before several later human NMN trials and is now temporally incomplete.
  • Underlying studies used heterogeneous species, populations, doses, formulations, routes, and endpoints.
  • Many proposed benefits were extrapolated from cell and animal models rather than demonstrated in people.
  • The review’s broad mechanistic discussion must not be converted into product or consumer outcome claims.

Funding and transparency

Funding

Funding support from Education New Zealand, New Zealand-China Tripartite Research Collaboration Fund – AUT 13772 to Professors Jun Lu, Jinyao Li, Tianlei Ying and Baohong Zhang; Professor Jun Lu also has received funding support from EZZ Life Science Holdings Pty Ltd.

Competing interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

HealthspanX observation

Jun Lu reported funding from EZZ Life Science Holdings Pty Ltd.; the publication separately states that the authors knew of no competing financial interests or personal relationships.

Interpretive weight

Limited

Narrative review dominated by preclinical evidence and written before most later human NMN trials, so it cannot establish clinical efficacy or long-term safety.

This record summarizes a publication; it is not medical advice or a claim that a HealthspanX product reproduces the study's results. Report a correction.

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