Dr. David Sinclair, Harvard professor of genetics and author of Lifespan: Why We Age — and Why We Don't Have To, is arguably the world's most famous advocate for NMN supplementation. His research on sirtuins and NAD+ precursors helped launch the modern longevity supplement industry. Discover the 7 proven benefits of NMN and how NMN supports healthy aging with the scientific evidence behind Sinclair\u2019s protocol.
But what does Sinclair actually take himself? And how has his protocol evolved as new research emerged? Here's a detailed breakdown of his current (2026) NMN regimen, based on his published interviews, podcasts, and scientific papers. For a comparison of how NMN stacks up against another popular NAD+ precursor, read our NMN vs NR guide.
Sinclair's daily NMN dose
Resveratrol in his stack
Years on the protocol
NAD+ boost in his clinical data
The Core Sinclair Protocol (2026 Edition)
NMN: 750mg Daily
Sinclair takes 750mg of NMN every morning, typically mixed into yoghurt. For comparison, most clinical studies use 500mg daily — see our NMN dosage guide for recommended amounts based on age and health goals. This is higher than the 500mg used in most clinical trials, reflecting his personal optimisation based on blood NAD+ measurements. He's stated that 500mg is sufficient for most people, but he personally prefers 750mg for maximal effect. Importantly, he uses pure beta-NMN (not the cheaper alpha form) and emphasises third-party testing for purity.
Resveratrol: 1g Daily
The famous "Sinclair stack" pairs NMN with 1 gram of resveratrol. Resveratrol activates sirtuin proteins (SIRT1 in particular), which are NAD+-dependent enzymes involved in DNA repair and cellular stress resistance. Sinclair takes resveratrol with a fatty meal (like yoghurt) to improve absorption. He prefers trans-resveratrol from Japanese knotweed extract, which has better bioavailability than grape-derived versions.
Morning Timing with Food
Sinclair takes both NMN and resveratrol in the morning with breakfast. This aligns with the body's natural circadian NAD+ rhythm, which peaks in the morning. Taking NAD+ precursors in the evening can disrupt sleep by interfering with the natural NAD+ decline that occurs at night. The fatty yoghurt also helps with resveratrol absorption.
Metformin: 500–850mg (Optional)
Sinclair has also taken metformin (a diabetes drug with potential longevity benefits) at 500–850mg daily, though he's been more cautious about this recently due to potential muscle side effects. In 2025 interviews, he indicated he cycles metformin rather than taking it continuously. This is not part of his core NMN/resveratrol stack but is worth mentioning as part of his broader longevity regimen.
Why This Combination Works: The Science
The NAD+ → Sirtuin Pathway
NMN raises NAD+ levels. Resveratrol activates sirtuins. Together, they create a synergistic effect: more NAD+ provides the fuel, while resveratrol increases the activity of the enzymes (sirtuins) that use that fuel for DNA repair, mitochondrial biogenesis, and cellular stress resistance.
Human Clinical Evidence
While no single trial has tested the exact Sinclair stack in humans, the components have strong individual support:
- NMN: Multiple human trials show 500–1000mg/day increases blood NAD+ by 40–60% within 2–4 weeks, with improvements in insulin sensitivity, muscle function, and energy.
- Resveratrol: Human studies show benefits for cardiovascular health, glucose metabolism, and inflammation markers at doses of 500–1000mg/day.
- Combination: Animal studies show NMN + resveratrol together produce greater benefits than either alone in measures of mitochondrial function and lifespan extension.
Try the Protocol Yourself
AlphaVita Labs NMN 500mg — 99.9% pure beta-NMN, GMP-certified, third-party tested. The closest to Sinclair's standard available in the UK.
Order NMN — £34.99 + Free ShippingHow Sinclair Measures Results
One thing that sets Sinclair apart from most supplement advocates is that he actually measures his NAD+ levels. He uses regular blood tests to track:
- Blood NAD+ concentration — his baseline and post-NMN levels (he's reported 40–60% increases)
- Biological age tests — using epigenetic clocks (DNA methylation markers) to assess cellular age vs chronological age
- Inflammatory markers — CRP, IL-6, and other biomarkers of systemic inflammation
- Metabolic markers — fasting glucose, insulin sensitivity, lipid panel
He's reported in multiple interviews that his biological age (as measured by epigenetic clocks) tests significantly younger than his chronological age — though he's cautious about attributing this solely to supplements, noting that diet, exercise, sleep, and stress management all contribute.
Sinclair's Full Anti-Ageing Stack (Beyond NMN)
NMN is just one part of Sinclair's broader longevity protocol. Here's everything he's disclosed publicly. For an evidence-based look at how NMN impacts energy levels, see our NMN energy boost guide. You can also read real-world experiences in the AlphaVita NMN 500mg 3-month review.
| Supplement / Intervention | Dose / Frequency | Primary Purpose |
|---|---|---|
| NMN | 750mg / morning | NAD+ restoration |
| Resveratrol | 1g / morning with fat | Sirtuin activation |
| Metformin | 500–850mg / cycled | AMPK activation, longevity pathway |
| Vitamin D3 + K2 | 5000 IU D3 / daily | Immune, bone, cardiovascular health |
| Quercetin | 500mg / daily | Senolytic (clearing senescent cells) |
| Low-dose Aspirin | 83mg / daily | Cardiovascular, potential anti-cancer |
| Intermittent Fasting | Skip breakfast / daily | mTOR suppression, autophagy |
| Exercise | HIIT + weights / 4–5×/week | NAD+ production, mTOR balance |
What Changed in Sinclair's Protocol for 2026
Sinclair's protocol has evolved based on emerging research. Notable updates as of 2026:
- Higher NMN dose: He moved from 500mg to 750mg after tracking his blood NAD+ response more carefully
- More cautious on metformin: Following data showing metformin may blunt exercise-induced muscle protein synthesis, he's moved to cycling it rather than daily dosing
- Added quercetin: Increased focus on senolytics — compounds that clear aged, dysfunctional cells from the body
- Reduced alcohol to near zero: Alcohol is a known NAD+ consumer; eliminating it preserves the gains from NMN supplementation
- Cold exposure added: Regular cold showers or ice baths to activate additional stress-response pathways that complement NAD+/sirtuin activation
Can You Replicate Sinclair's Protocol?
Most of Sinclair's stack is accessible without a prescription (metformin being the main exception in most countries). Here's a practical guide to implementing the core of his protocol:
Start with NMN 500mg/day
500mg is the most clinically validated dose and what Sinclair himself recommends for most people. Take it in the morning with breakfast. AlphaVita Labs NMN 500mg delivers the full therapeutic dose in a single capsule — 99.9% pure beta-NMN with GMP certification and third-party lab testing. This is the standard Sinclair recommends: one capsule, once daily, morning.
Add Resveratrol if Possible
Trans-resveratrol (500mg–1g daily) stacked with NMN amplifies the sirtuin activation pathway. Take it with a fatty meal for best absorption. Look for products standardised to ≥98% trans-resveratrol from Japanese knotweed.
Support with Vitamin D3 + K2
Sinclair takes 5,000 IU of Vitamin D3 paired with K2 (MK-7 form) to direct calcium into bones and away from arteries. This combination supports immune function, bone density, and cardiovascular health — and most people in northern climates are deficient.
Intermittent Fasting — Free, Powerful
Skipping breakfast (eating in a 6–8 hour window each day) activates autophagy, suppresses mTOR, and preserves NAD+ for cellular repair rather than digestion. Sinclair describes this as one of the most powerful interventions available — and it costs nothing.
Sinclair's Perspective on Supplement Quality
Sinclair has repeatedly stressed that NMN purity matters enormously. The NMN supplement market is poorly regulated, and independent testing has found that many products contain significantly less NMN than labelled — or contain impurities from low-grade synthesis.
Key quality markers he recommends checking:
- Beta-NMN form — not alpha-NMN, which is less stable and less bioavailable
- Third-party purity testing — independent lab verification (not self-reported)
- GMP certification — manufacturing quality standard
- No unnecessary excipients — fillers like magnesium stearate dilute the active ingredient
- 500mg per capsule — anything less requires multiple capsules for a therapeutic dose
For a full comparison of top products that meet these standards, see our best NMN supplements UK ranking. You can also buy NMN supplements that meet all these criteria from AlphaVita Labs.
NMN That Meets Sinclair's Standards
AlphaVita Labs NMN 500mg is 99.9% pure beta-NMN, GMP-certified, and third-party tested. Every batch. Ships to the UK and worldwide.
Order NMN — £34.99 + Free ShippingThe Bottom Line on the Sinclair Protocol
David Sinclair's NMN protocol is built on a clear scientific rationale: raise NAD+ levels, activate sirtuins, reduce mTOR signalling, and support cellular repair mechanisms that decline with age. His core stack of NMN + resveratrol, taken in the morning with food, is straightforward to replicate.
The critical caveat: Sinclair is a scientist who measures his results. He doesn't guess — he tests his blood, tracks his biomarkers, and adjusts accordingly. The protocol works best when combined with the lifestyle fundamentals he also practises: intermittent fasting, regular intense exercise, minimal alcohol, quality sleep, and stress management.
If you're going to add NMN to your routine, start with a high-quality 500mg product, take it consistently every morning, and give it 4–8 weeks before assessing results. That's the Sinclair approach — and the science supports it.