Longevity has become one of the most searched topics of the year, driven by a wave of new studies on NAD+, cellular senescence and mitochondria. But between marketing hype and real science lies a world of difference. Here is our 2026 guide to the solutions that actually have evidence behind them for slowing ageing โ and the ones that remain bets.
๐ฎ Want an interactive version? Our Picksly Health page matches each cause of ageing to its supplement and includes a playful simulator of years gained from taking it for life.
Before supplements: the 4 fundamentals
No supplement compensates for poor sleep, a sedentary lifestyle or an unbalanced diet. Studies on human longevity (including those on blue zones) all converge on the same basics, which are free and far better documented than any pill:
- Sleep: 7 to 9 hours a night, on a regular schedule. Most cellular repair happens during deep sleep.
- Physical activity: strength training (2 to 3 sessions/week) is now considered at least as important as cardio for longevity.
- Diet: little ultra-processed food, sufficient protein and fibre intake, moderate calorie restriction if needed.
- Managing chronic stress: continuously elevated cortisol accelerates several biological markers of ageing.
Picksly tip: if any one of these 4 points is clearly in need of improvement for you, fix it before opening your wallet for supplements. The return on investment is incomparable.
The 8 most studied supplements
Once the fundamentals are in place, some supplements have a strong enough level of evidence to be worth considering. They're ranked here from most solid to most speculative โ the bar for entering this list is simple: at least one randomised controlled trial in humans, not just animal data or an observational association.
Omega-3 (EPA/DHA)
The supplement with the strongest human evidence: the largest meta-analyses (up to ~176,000 combined participants) show a significant reduction in cardiovascular mortality and heart attacks. One caveat: this effect isn't found for all-cause mortality or stroke, and a slight increased risk of atrial fibrillation has been observed at high doses โ worth flagging to your doctor if you have a history of heart problems. Anti-inflammatory, good for the brain and eyes. Usual dose: 2 to 3 g of EPA/DHA per day, with a meal containing fat for absorption.
Creatine
Probably the best-established supplement on this entire list, though rarely presented as a longevity supplement: decades of trials show gains in strength and muscle mass in adults aged 50 to 80, especially when combined with strength training โ sarcopenia (age-related muscle loss) is one of the best predictors of loss of independence. The evidence on cognition is more recent but encouraging. The cheapest and most studied supplement on the list. Usual dose: 3 to 5 g/day of creatine monohydrate, with no need for a loading phase.
Vitamin D3 + K2
A large part of the population is deficient in vitamin D, especially in winter. D3 acts on immunity, mood and bone health; K2 (the MK-7, trans isomer form โ the cis form is inactive) directs calcium toward bones rather than arteries. Usual dose: 2,000 to 5,000 IU of D3 + 100 to 180 ยตg of K2, ideally adjusted after a blood test. K2 acts on the same clotting factors as warfarin: explicitly flag this if you're on blood thinners.
GlyNAC (glycine + N-acetylcysteine)
Targets a mechanism that nothing else on this list directly addresses: glutathione, the body's main antioxidant, which declines with age. A randomised placebo-controlled trial (Baylor College of Medicine, 74 adults aged 71-80, 16 weeks) showed a statistically significant improvement in 10 of the 13 ageing markers measured: oxidative stress, mitochondrial function, inflammation, insulin resistance, endothelial function, muscle strength, walking speed and cognition. One of the most comprehensive trials on this list, with a decent sample size for this type of study. Usual dose: roughly 0.1 g/kg of glycine + 0.04 g/kg of NAC per day โ to be adjusted with a healthcare professional.
CoQ10 (ubiquinol)
Fuels cellular energy production in the mitochondria. Its strongest evidence (the Q-SYMBIO trial) concerns patients with established heart failure, where supplementation clearly reduces mortality and hospitalisations over 2 years โ a result that doesn't generalise as-is to a healthy population, where the effect is more modest. Natural production declines after age 40. Usual dose: 100 to 200 mg/day. Ubiquinol (the already-active form) has a genuine absorption advantage, especially in older people, but it isn't the form with the strongest mortality evidence โ it's a bioavailability/evidence trade-off worth knowing, not an obvious choice.
NMN or NR (NAD+ precursors)
NAD+ drops by roughly half between ages 40 and 60; it fuels DNA repair and sirtuins, proteins associated with longevity. A comparative trial published in January 2026 confirms that both NMN and nicotinamide riboside (NR, a similar alternative) double circulating NAD+ within 14 days, which plain nicotinamide does not โ and short trials (8-12 weeks, 250-500 mg/day) show modest improvements in insulin sensitivity and lipid profile in middle-aged adults. Benefits on longevity itself remain unproven in humans. A serious point of caution: several independent analyses of products sold online have found actual dosages far below what's advertised in a majority of samples โ a certificate of analysis (COA) and an advertised purity of โฅ99% are not optional here.
Fisetin
A plant-derived senolytic, studied for its ability to clear senescent cells (damaged cells that secrete inflammatory signals). In mice, results are solid; in humans, the picture is more mixed than sometimes presented โ a 2026 randomised trial on knee osteoarthritis showed no significant benefit on pain or function at the tested dose, even though the tolerability profile remained good. Other trials are ongoing (endothelial function, frailty). Generally taken as a short course (2-3 days) followed by a pause of several weeks, rather than continuously.
Urolithin A
Promotes mitophagy, the recycling of damaged mitochondria. Several clinical trials show an improvement in muscular endurance (~12%) after several months of regular use, with a drop in inflammatory markers (CRP). A 2026 trial (published in Nature Aging, 50 middle-aged adults, 1,000 mg/day for 4 weeks) also shows a better immune response versus placebo โ one of the most interesting signals on this list. It's also the most expensive item on this list, and the clinically tested forms (Mitopure) remain scarce on the market.
What we don't include (despite their popularity)
Some heavily marketed supplements don't appear on this list. Not an oversight: they don't clear our entry bar (a controlled human trial with a reproduced positive result).
- Resveratrol: over 150 human trials, mostly neutral. Its bioavailability is too low to reach the active concentrations tested in the lab โ no trial has shown a benefit on mortality or longevity.
- Spermidine: solid biological rationale (autophagy) and interesting observational data, but the largest human trial to date (SmartAge, 100 participants, 12 months) was negative on its primary endpoint.
- Alpha-ketoglutarate (AKG): the "8 years younger" figure that circulates comes from an observational study (4,260 self-selected users, no controlled trial) โ correlation, not proof of causation. Randomised trials are underway (ABLE, NCT05706389), with results pending.
- Taurine: the starting point (a decline in circulating taurine with age, a 2023 mouse/monkey study) was contradicted in 2025 by several human cohorts showing no consistent decline. The "anti-ageing" angle remains unconfirmed in humans at this stage.
How to avoid getting scammed
The longevity supplement market is lightly regulated, and advertising is often ahead of the science.
- Demand a certificate of analysis (COA) from a third-party lab, especially for NMN.
- Be wary of "proprietary" formulations that hide the actual dosage of each ingredient.
- A single study isn't proof: look for repeated trials in humans, not just in mice.
- Price per gram of active ingredient varies enormously between brands for the same advertised dosage โ compare before buying, not just the price on the bottle.
A budget that varies widely depending on priorities
The monthly cost of this list ranges broadly from under โฌ30 (omega-3 + creatine + D3/K2) to over โฌ300 when adding GlyNAC, NMN, CoQ10, a fisetin course and urolithin A. As with any purchase, it's better to prioritise based on your means rather than aiming for the full list at once:
- Budget profile: omega-3 + creatine + vitamin D3/K2. This is the cheapest base, and on its own carries the highest level of evidence on the whole list.
- Smart profile: the base above + GlyNAC and CoQ10 taken continuously, and possibly a monthly fisetin course.
- Premium profile: the full stack, including urolithin A, with regular biological monitoring (lipid panel, vitamin D, inflammatory markers) to adjust dosages over time.
For this type of product, price gaps between brands for equivalent dosage and purity are often considerable โ exactly the kind of comparison that the Picksly extension automates on product pages, whatever your profile.
Key takeaway
This is not medical advice. Talk to your doctor before starting, especially if you're already on medication (blood thinners in particular) or have a chronic condition. A blood panel before and after is the only way to know whether a supplement is genuinely doing anything for you. And none of this evidence, today, allows anyone to claim that a supplement extends human life โ the strongest data remain either animal-based or focused on intermediate biological markers, not on longevity itself.
FAQ
Which longevity supplement has the most evidence?
Creatine and omega-3 (EPA/DHA) have the strongest human evidence and the best cost/benefit ratio to start with โ closely followed by vitamin D3/K2 (in case of deficiency) and GlyNAC.
Is NMN safe?
Studies consider it safe at the tested doses (up to roughly 1,250 mg/day), but the real risk lies elsewhere: a large share of products sold online don't reach their advertised dosage. A third-party certificate of analysis is essential.
Why no resveratrol or spermidine, given how popular they are elsewhere?
Because they don't clear our entry bar (a controlled human trial with a reproduced positive result) โ see the dedicated section above. This isn't a final verdict: the science evolves, and this page is updated accordingly.
Should you take all these supplements at once?
No. Start with the fundamentals (sleep, exercise, diet), add the supplements with the most evidence first (creatine, omega-3, D3/K2), and only add the more costly and speculative ones (NMN, urolithin A) if your budget and your interest in regular biological monitoring allow it.
Do these supplements replace a healthy lifestyle?
No, and no serious study claims otherwise. They are additions to an already solid foundation, not a shortcut.