NMN vs NR: What's the Difference and Which Should You Take?

If you're looking into NAD+ supplements, you'll quickly encounter two names: NMN and NR. Both are precursors to NAD+ — meaning your body converts them into NAD+. But they're different molecules, they work in slightly different ways, and they have different evidence bases behind them.

Here's what the science says.

What is NMN?

NMN (nicotinamide mononucleotide) is one step closer to NAD+ in the biosynthetic pathway. When you take NMN, your body converts it into NAD+ quite directly. Human clinical trials have confirmed that oral NMN supplementation raises blood NAD+ levels measurably — in some studies, roughly doubling them with a gram per day.

NMN is the precursor that David Sinclair himself has taken for over a decade. It's the most studied NAD+ precursor in the context of longevity and the one most featured in the ageing science literature.

What is NR?

NR (nicotinamide riboside) takes a slightly different route to NAD+. It's also well-studied — in fact, NR has more published human clinical trials than NMN. Multiple studies have confirmed it raises NAD+ levels effectively and safely.

NR also has a well-established safety profile, having been studied for longer in humans. For those who want the most clinically-proven NAD+ precursor, NR has a strong evidence base.

Which should you take?

Both are excellent choices, and both will raise your NAD+ levels. The main considerations:

• For NMN: If you want the form most associated with David Sinclair's own research and most closely linked to the longevity science headlines, NMN is the natural choice.
• For NR: If you want the most clinically tested human trial data and a longer established safety record, NR is compelling.
• Stacking with polyphenols: Both work best when combined with sirtuin activators like resveratrol or pterostilbene — think of NAD+ as the fuel and polyphenols as the accelerator pedal.