Metformin vs NMN for longevity
Short answer: For longevity, users rate them about the same: 100% report improvement with Metformin (11 reports) and 100% with NMN (12 reports).
Metformin has 1,367 meta-analyses and 3,450 randomized trials on PubMed; NMN has 11 and 17.
Based on 175 reports about Metformin and 366 about NMN. Not medical advice.
| Metformin Medication | NMN Supplement | |
|---|---|---|
| Users say it helped | 29%helped67 reports · medium confidence | 61%helped113 reports · high confidence |
| Verdict | Mixed | Mostly positive |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 1,367 / 3,450 | 11 / 17 |
| Mainly used for | ||
| Energy % reporting improvement | 40% (10) | 92% (77) |
| Performance % reporting improvement | 0% (15) | 100% (16) |
| Blood sugar % reporting improvement | 96% (27) | 100% (2) |
| Longevity % reporting improvement | 100% (11) | 100% (12) |
| Sleep % reporting improvement | 100% (2) | 65% (20) |
| Common side effects | stomach issues, diarrhea, b12 depletion, nausea | insomnia, jitteriness, drowsiness, elevated blood |
| Typical dose reported | Not listed | 1 g / daily |
The choice of metformin or COCP treatment should be based on symptoms, noting some biochemical benefits from combination treatment targeting both major endocrine disturbances seen in PCOS (hyperinsulinemia and hyperandrogenism).
J Clin Endocrinol Metab, 2024 ↗“Metformin currently has enough data for me personally to feel comfortable not only taking it myself (and my wife), but also recommending it to my patients.”
Overall, NAD⁺ augmentation shows clear biological activity, but clinical effectiveness for anti-aging or wellness outcomes remains inconclusive. Larger, well-designed randomized trials with longer follow-up and prespecified clinically meaningful endpoints are needed, particularly for parenteral approaches.
Ageing Res Rev, 2026 ↗“I've been using NMN for 3 years now, and I had great results with it along with many other supplements. I'm 47 and I look a lot younger and healthier than when I first started NMN.”
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Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate