The longevity shelf is crowded and getting more so. NMN, NR, resveratrol, spermidine, fisetin, CoQ10 — every few months a new molecule gets its moment. If you're trying to decide where to start, the marketing isn't much help, because nearly every product claims to be the one that matters most.
So here's a level-headed comparison. The honest headline first: no single supplement has a proven longevity benefit in humans. What differs between these compounds is how much human research exists, how reliably they do the specific thing they're known for, and how early the science still is. That's the lens we'll use.
One thing to get straight before the comparison
These compounds aren't all trying to do the same job, so "which is best" is partly the wrong question. They cluster into different mechanisms that researchers study:
NAD+ precursors — NMN and NR. Studied for their effect on NAD+ levels, a coenzyme that declines with age.
Sirtuin-interacting compounds — resveratrol is the most well-known.
Autophagy-related compounds — spermidine is most associated with this cellular "cleanup" process in research.
Senolytics — fisetin, studied for its interaction with senescent ("worn-out") cells.
Mitochondrial support — CoQ10, long studied in the context of cellular energy production.
Knowing which bucket a compound sits in tells you more than any ranking.
NMN
NMN is a precursor to NAD+. Of the compounds on this list, it's one of the most actively studied in human trials — several clinical studies have measured its effect on NAD+ levels. The evidence base is still early: trials tend to be small and short, and raising a biomarker is not the same as a proven health outcome. But if you want a compound where the human research is comparatively active rather than purely preclinical, NMN is a reasonable place to look.
NR (Nicotinamide Riboside)
NR is the other main NAD+ precursor — a close cousin of NMN, different molecule, same destination. NR has its own body of human research and a longer commercial track record in some markets. The NMN-versus-NR debate is genuinely unsettled, and anyone who tells you one is definitively superior is ahead of the evidence. The short version: they're both NAD+ precursors, and the choice between them is closer than the marketing on either side admits.
Resveratrol
Resveratrol is the polyphenol most associated with sirtuins in laboratory research. Its weakness is absorption: plain resveratrol is poorly absorbed in the gut and broken down quickly, and independent labs have had trouble replicating some early findings. It's frequently paired with NMN, but the human evidence for resveratrol on its own is less clear-cut than its fame suggests.
Spermidine
Spermidine is most associated with autophagy in research — the process by which cells clear out and recycle damaged components. The preclinical interest is real, and spermidine occurs naturally in foods like wheat germ, aged cheese and soy. As with the others, the human evidence is early. It's a different mechanism from the NAD+ story, which is exactly why some people are curious about it.
Fisetin
Fisetin is a plant compound studied as a senolytic — researched for whether it can help clear senescent cells, the worn-out cells that accumulate with age. Animal studies have been encouraging, and at least one small human study looked at markers of senescence. "Promising but early" is the fair summary. Fisetin is a watch-this-space compound rather than a settled one.
CoQ10
CoQ10 is the most established of the group, with a long history of use in the context of cellular energy production. Natural levels are understood to decline with age. It sits in a different category from the NAD+ and senolytic compounds — less of a frontier molecule and more of a long-standing one.
So where should you start?
We're an NMN company, so take this with appropriate salt — but here's the reasoning we'd actually give a friend.
Start with one compound, not five. Stacking everything at once means you'll never know what's doing what, and it's an expensive way to find out. Pick a single starting point and give it a fair, consistent run.
Favour the compounds where human research is more active. Among this list, the NAD+ precursors — NMN and NR — have comparatively more human study behind the specific thing they're known for. That's a defensible reason to start there.
Match the mechanism to your curiosity, not the hype. If the NAD+ story interests you, NMN or NR is the entry point. If you're drawn to autophagy or senolytic ideas, know that you're choosing a more experimental, earlier-stage area — and that's a legitimate choice as long as you go in clear-eyed.
Keep your expectations honest. None of these is a shortcut, and none has a proven human longevity outcome. They're long-term, consistent habits for people who find the underlying science interesting — not switches that flip something on.
Get individual advice if you take medication, are pregnant or breastfeeding, or have a health condition. Some of these compounds — resveratrol especially — can interact with medicines.
Where Ivvion fits
We make NMN: Essential at 500 mg a day, and Elite, a 1,000 mg liposomal formulation built for absorption. We chose NMN because it's one of the more actively studied compounds in this space, and we chose liposomal for Elite because absorption is the real bottleneck for a lot of supplements.
We're not going to tell you NMN beats every alternative, because the evidence doesn't support a clean league table. What we can say is that it's a reasonable, well-studied place to start.
Food supplement. Not a medicine. Does not diagnose, treat, cure or prevent any disease. If you are pregnant, breastfeeding, on prescription medication, or have a health condition, consult your GP before taking any supplement.