The 20 Best Anti-Aging Supplements: What the Science Actually Says

Daniel Platteau

What do we mean by "anti-aging"?

Aging is not a disease but a biological process: oxidative stress, chronic low-grade inflammation ("inflammaging"), telomere shortening, mitochondrial decline, cellular senescence and muscle loss. An "anti-aging" supplement is a substance that acts on one or more of these mechanisms.

A necessary word of honesty before we begin: no supplement "stops" aging, and the quality of evidence varies enormously from one compound to another. We rank them here by the strength of human data (randomized controlled trials > observational studies > animal studies). Lifestyle (exercise, sleep, diet) remains by far the most powerful lever: supplements only… supplement.

The essentials: solid human evidence

Vitamin D3: the VITAL mega-trial (25,871 participants, 5 years) showed that 2,000 IU/day reduces autoimmune disease by 22 % and cancer mortality in extended analyses. Meta-analyses (BMJ, 2021) confirm reduced respiratory infections. Deficiency affects most Europeans in winter.
Omega-3 (EPA/DHA): in the same VITAL trial, 1 g/day of omega-3 reduced heart attacks by 28 %. Epigenetic studies (DO-HEALTH) suggest a measurable slowing of biological clocks. Typical dose: 1–2 g/day of EPA+DHA.
Creatine monohydrate: not just for athletes! It preserves muscle mass and strength in older adults (2022 meta-analysis in Nutrients) — two major predictors of longevity — and shows promising cognitive effects in the elderly.
Hydrolyzed collagen (peptides): several randomized trials (e.g., Proksch et al., Skin Pharmacology and Physiology, 2014) show improved skin elasticity and hydration and reduced wrinkles at 2.5–10 g/day for 8–12 weeks. Documented benefits for joint pain too.
Magnesium: cofactor of more than 300 enzymes, including DNA-repair enzymes. Chronic deficiency is associated with increased inflammation and shorter telomeres in observational studies. Bisglycinate and citrate forms are best absorbed.
Vitamin K2 (MK-7): directs calcium toward bones rather than arteries. The Knapen trial (2013, 3 years) showed slowed arterial calcification in postmenopausal women. A logical partner for vitamin D3.

Antioxidants and polyphenols: encouraging evidence

Coenzyme Q10 (ubiquinol): essential for mitochondrial energy production, its natural levels fall with age (and with statins). The KiSel-10 trial (Sweden, 2013, combined with selenium) showed reduced cardiovascular mortality persisting 12 years after the study.
Selenium: antioxidant via glutathione peroxidases; the second half of the KiSel-10 duo. Caution: the gap between a useful and a toxic dose is narrow (do not exceed 100–200 µg/day).
Curcumin: a powerful anti-inflammatory (NF-κB inhibition). Meta-analyses show real effects on inflammatory markers and osteoarthritis pain. The catch: bioavailability — choose forms with piperine or liposomal formulations.
Resveratrol: sirtuin activator, star of yeast, worm and mouse studies. In humans, results are more modest but real on vascular function and blood sugar in older or diabetic adults. Evidence: "promising," not definitive.
Astaxanthin: a carotenoid with remarkable antioxidant power. Human trials document effects on skin elasticity, eye fatigue and oxidation markers (6–12 mg/day).
Quercetin: a flavonoid studied for senolytic properties (clearing senescent cells, combined with dasatinib in Mayo Clinic work). A senolytic effect is not yet demonstrated for quercetin alone.
EGCG (green tea): epigallocatechin gallate improves metabolic and cardiovascular markers in meta-analyses. Caution: high concentrated doses have been linked to rare liver toxicity — brewed tea remains the safest route.
Sulforaphane (broccoli): activates the Nrf2 pathway, the conductor of our cellular antioxidant defenses. Positive human studies on detoxification and inflammatory markers.

Cellular longevity boosters: the research frontier

NMN / Nicotinamide riboside (NR): precursors of NAD+, a coenzyme whose levels collapse with age (–50 % between 40 and 60). Human trials (e.g., Yoshino et al., Science, 2021) confirm they raise blood NAD+ and improve insulin sensitivity in some populations. Long-term clinical benefits remain to be proven. Note: NMN has been banned as a supplement in the US since 2022 (reclassified as an investigational drug) — NR remains available in Europe.
Spermidine: a polyamine from wheat germ and fermented foods, a potent autophagy inducer (cellular "recycling"). The Kiechl et al. cohort study (Nature Medicine, 2018) links a spermidine-rich diet to reduced mortality. Interventional data are still limited.
Alpha-lipoic acid (ALA): a universal antioxidant (water- and fat-soluble) that regenerates vitamins C and E. Decent evidence for diabetic neuropathy; general anti-aging data are more preliminary.
Vitamin C + zinc: the classic immune-support duo. Zinc is notably linked to telomerase activity and shorter infections — important since immunosenescence is a pillar of aging.
Probiotics / postbiotics (e.g., Akkermansia): the microbiome influences systemic inflammation, immunity and even cognition (the "gut-brain axis"). Trials on pasteurized Akkermansia muciniphila (Depommier et al., Nature Medicine, 2019) show encouraging metabolic effects.
Glycine (or glycine + NAC = "GlyNAC"): a Baylor College of Medicine pilot study (2021) showed GlyNAC corrected several aging hallmarks (oxidative stress, glutathione, cognitive and physical function) in older adults. Small sample, spectacular results: confirmation needed.

Essential precautions

Talk to your doctor, especially if you take medication (anticoagulants, statins, diabetes drugs): interactions are real.
Quality varies enormously: prefer brands verified by third-party labs (USP, NSF, IFOS for omega-3).
More is not better: selenium, zinc, vitamin A and concentrated EGCG have toxicity thresholds.
A supplement never replaces physical exercise, sleep, a plant-rich diet and social bonds — the four proven pillars of longevity (Blue Zones).

Major ongoing studies

Longevity research is booming. Watch: the TAME trial (metformin vs aging, led by Nir Barzilai), rapamycin trials (PEARL, TRIAD), phase-2 spermidine and memory trials (smartAge), and work on senolytics (fisetin, Mayo Clinic). These molecules (metformin, rapamycin) are drugs: they are therefore not in our supplement list, but they could rewrite this ranking by 2030.