Best Longevity Supplements, Graded by Evidence
Longevity supplements graded by human trials, with each trial linked, the monthly cost at the dose that trial used, and which ones missed their targets.
Compiled from published studies and manufacturer specifications, checked .
We have not tested products ourselves. How we research
Quick verdict
Only creatine, and vitamin D when you are deficient, have solid human evidence for a concrete benefit. Most fashionable compounds (NMN, NR, urolithin A, spermidine) have small or mixed trials. None has been shown to extend human lifespan.
Talk to your doctor first. This is general information, not medical advice. Supplements and devices can interact with medicines and health conditions. We quote study protocols for context and do not recommend doses.
The short answer: two compounds have solid human evidence for a concrete benefit, creatine for exercise performance and vitamin D for people who are deficient. Most trending “longevity” compounds sit at Emerging or Weak: small trials, blood markers instead of outcomes, or missed primary endpoints. No supplement here has been shown to extend human lifespan. Talk to your doctor before starting any of them.
The ladder
Grades follow the rubric (human evidence, effect size, safety, product transparency). A grade describes the strength of evidence for one named outcome; it is not a recommendation to buy. Monthly cost is the price of a brand’s product at the dose used in the cited trial (not a suggested dose), from our cost per study dose dataset: brand pages read 28 Sept 2026, USD, before tax and shipping. The cost shown is the cheapest costed product in the dataset, which covers only a few brands per compound.
| Compound | Grade | What the human evidence shows | Dose used in trial | Cheapest costed, per month |
|---|---|---|---|---|
| Creatine monohydrate | Strong (exercise performance); Moderate (memory, older adults) | The ISSN position stand supports it for performance. A meta-analysis of 8 RCTs found a memory benefit (SMD 0.29), concentrated in adults aged 66 to 76, with high heterogeneity. Not tested for lifespan. | 5 g/day (Preen 2003) | $7.19 |
| Vitamin D3 | Moderate (correcting deficiency); Weak (preventing disease in replete adults) | VITAL (25,871 adults, 5.3 years): no lower risk of cancer (HR 0.96) or major cardiovascular events (HR 0.97). | 2,000 IU/day | $2.39 |
| Omega-3 | Moderate, conditional | VITAL: no reduction in major cardiovascular events (HR 0.92, CI 0.80 to 1.06); heart attack was lower (HR 0.72) as a secondary result. REDUCE-IT, prescription purified EPA in high-risk patients on statins, cut its primary endpoint (HR 0.75), but more patients were hospitalised for atrial fibrillation (3.1% vs 2.1%). | 1 g fish-oil capsule/day, 840 mg EPA+DHA (VITAL) | $18.13 |
| Magnesium | Moderate (blood pressure) | Meta-analysis of 34 RCTs on blood pressure. A surrogate marker, not an outcome. | 368 mg elemental/day (median across trials) | $8.56 |
| Vitamin K2 (MK-7) | Emerging | One 3-year RCT of 244 postmenopausal women found lower arterial stiffness on two measures. An author is affiliated with VitaK, an MK-7 supplier. | 180 mcg/day | $7.19 |
| Taurine | Emerging | A 2026 meta-analysis of 34 RCTs found lower fasting glucose, HbA1c and triglycerides. Blood markers only. | 1.5 g/day (lower bound of the range) | $2.47 |
| CoQ10 | Moderate in heart failure; not shown in healthy people | Q-SYMBIO: 420 heart-failure patients on top of standard therapy; primary long-term endpoint 15% vs 26% (HR 0.50). | 300 mg/day | $29.92 |
| NMN | Emerging | Two RCTs (Igarashi 2022, Yi 2023) look at NAD+ levels. Igarashi found blood NAD+ rose, only nominal gains in gait speed and grip strength (“should be validated in larger studies”), and no effect on body composition. | 250 mg/day (Igarashi) | $8.84 |
| NR | Weak | Dollerup 2019: no effect on glucose tolerance or insulin in men with obesity over 12 weeks. | 2,000 mg/day | $326.67 |
| Urolithin A | Emerging | Liu 2022 (66 adults, 4 months): the primary endpoints (6-minute walk, muscle ATP) did not significantly improve; muscle endurance, a secondary endpoint, did. Several authors are affiliated with the product maker Amazentis. | 1,000 mg/day | $198.00 |
| Spermidine | Weak | SmartAge (100 older adults, 12 months): no significant change in memory or secondary outcomes. Some authors disclosed equity in a spermidine company. | 0.9 mg/day (wheat-germ extract) | not calculable |
The NR, urolithin A and CoQ10 doses used in trials are many times a single label serving, which is why their monthly cost looks high. That is a fact about the trials, not a target for you.
What the ladder says
- Correcting a deficiency is the best-supported use. A blood test shows whether vitamin D or magnesium is worth thinking about; see longevity biomarkers.
- “It raises a biomarker” is not “it helps you live longer.” NMN trials measured NAD+ in blood; taurine and magnesium trials measured glucose, cholesterol and blood pressure, not disease.
- Null results matter. The vitamin D and standard omega-3 trials, the spermidine trial and the primary endpoints of the urolithin A trial did not show benefit. Roundups that leave this out are selling.
- Ties to product makers are flagged where the papers disclose them (urolithin A, spermidine, MK-7).
- Prescription drugs are a separate topic. Metformin and rapamycin need a physician; this page gives no guidance on either.
Where to go next
Compare compounds on price at the trial dose in the cost per study dose table. Read the NMN vs NR comparison before buying an NAD+ product. For how the compounds fit together, see the complete longevity stack. Browse every grade in the research database.
A “third-party tested” label is only as good as the certifier behind it: what NSF, USP, Informed Sport and IFOS check.
Method note
Researched from PubMed abstract records (read 29 Sept 2026), the trials’ DOIs linked above, and brand pages for prices (28 Sept 2026). Grades are our judgement using the published rubric. We did not test any product. The price sample is a convenience sample of brands whose pages could be read, not a market ranking. General information, not medical advice: talk to your doctor before starting supplements, especially with prescription medicines or a health condition.
See also: Glycine for sleep: the trials and the cost.
See also: Longevity supplements with null trials: an evidence ledger.
Common questions
Is there any supplement proven to extend human lifespan?
No. No supplement on this page has a randomised trial showing longer human life. The grades below are about specific outcomes (muscle, blood pressure, deficiency, heart failure), and each links the trial behind it.
Which longevity supplements have the strongest evidence?
Creatine for exercise performance (with a smaller, mixed signal for memory in older adults) and vitamin D for people who are deficient. Omega-3 depends on the product and the person: a large trial of ordinary fish-oil capsules found no reduction in major cardiovascular events, while a trial of prescription purified EPA in high-risk patients did.
Should I take these without asking a doctor?
Ask one first, particularly if you take prescription medicines, are pregnant, or have a heart, kidney or clotting condition. Omega-3 and vitamin K both interact with some medicines and conditions. This page describes what studies found; it is not dosing advice.
Sources
- VITAL, vitamin D and cancer / cardiovascular disease (NEJM 2019) checked 29 Sept 2026
- VITAL, marine n-3 fatty acids (NEJM 2019) checked 29 Sept 2026
- REDUCE-IT, icosapent ethyl (NEJM 2019) checked 29 Sept 2026
- Creatine and memory, systematic review and meta-analysis (Nutr Rev 2023) checked 29 Sept 2026
- ISSN position stand on creatine supplementation (2017) checked 29 Sept 2026
- MK-7 and arterial stiffness in postmenopausal women (Thromb Haemost 2015) checked 29 Sept 2026
- Magnesium and blood pressure, meta-analysis of 34 RCTs (Hypertension 2016) checked 29 Sept 2026
- NMN in older men (npj Aging 2022) checked 29 Sept 2026
- NMN dose-response in middle-aged adults (GeroScience 2023) checked 29 Sept 2026
- NR in men with obesity (J Clin Endocrinol Metab 2019) checked 29 Sept 2026
- Urolithin A and muscle endurance in older adults (JAMA Netw Open 2022) checked 29 Sept 2026
- Spermidine in subjective cognitive decline, SmartAge (JAMA Netw Open 2022) checked 29 Sept 2026
- Oral taurine and cardiometabolic risk factors, meta-analysis (Nutr Rev 2026) checked 29 Sept 2026
- Q-SYMBIO, CoQ10 in chronic heart failure (JACC Heart Fail 2014) checked 29 Sept 2026
- Longevity Intel cost per study dose dataset (prices checked 2026-09-28) checked 28 Sept 2026
Update log
- Rebuilt from a ranked list into an evidence-graded ladder: each grade links the deciding trial, null and industry-linked results are stated, and monthly cost is priced at the dose the cited trial used. Removed untraceable claims.
Data and comparisons
- Vitamin D3 evidence record
Deficiency is endemic (over 40% of Western adults) and associated with higher all-cause mortality
- CoQ10 evidence record
Essential for mitochondrial electron transport chain
- Creatine evidence record
The most evidence-backed performance supplement
- Magnesium evidence record
Required for 300+ enzymatic reactions
- Creatine vs HMB: Best anti-sarcopenia supplement?
Creatine
- Magnesium Forms Compared: Glycinate vs L-Threonate vs Malate
Glycinate default; threonate for brain
Related reading
Complete Longevity Supplement Stack: What to Take, When, Why
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