Best peptides for longevity
For healthspan, mitochondria, telomeres, immune aging, cellular energy.
Reviewed by the amino101 editorial team. , first published .
Nothing on this list has been shown to make a human live longer, and anyone who says otherwise is selling a vial. What exists is a handful of compounds with real biology behind them, animal data that points the right way, and human trials that were run for something else. The list is ranked by how much of that human data there is, which is a different question from how loudly each one is marketed. Two of the picks are not peptides, and one of them is an approved drug for a disease you almost certainly do not have. This is an educational ranking, not a protocol.
- 1Full guideSS-31Extensively studied
The most human trials of anything here. As elamipretide it won FDA accelerated approval in 2025 for Barth syndrome, a rare mitochondrial disease. The large mitochondrial myopathy trial failed, and community doses of 5 to 10 mg are a fraction of the 40 mg clinical dose.
Dosage5 to 40 mgFrequencyonce dailyRouteSubcutaneous, Intravenous - 2Full guideThymosin Alpha-1Well researched
Immune aging is a real part of aging, and this is an approved drug abroad with randomized trials showing better vaccine antibody response in older adults and dialysis patients. Not a longevity drug, but the best supported way on this list to shore up an aging immune system.
Dosage0.5 to 1.6 mgFrequencytwice weekly, up to daily in short acute protocolsRouteSubcutaneous - 3Full guide
Not a peptide. A coenzyme that declines with age; restoring it helps old mice. Human trials of the oral precursors NR and NMN raise blood NAD+ reliably with modest functional results. Injected NAD+ has one small pharmacokinetic study and a lot of clinic tradition.
Dosage50 to 100 mgFrequencydaily or a few times per week for injections; IV infusions weekly to monthlyRouteSubcutaneous, Intramuscular, Intravenous, Oral - 4Full guideEpithalonLimited research
The one actually sold for longevity. Telomerase activation in cultured cells, lifespan extension in some mouse strains, a 12 year open label follow up of the parent extract in elderly Russians. Nearly all of it from one research network, with no independent replication of the telomere claim.
Dosage5 to 10 mgFrequencyonce dailyRouteSubcutaneous, Intramuscular, Intranasal, Oral - 5Full guideMOTS-cLimited research
A mitochondrial peptide that doubled running capacity in old mice and improved insulin sensitivity on a high fat diet. Native MOTS-c has no human trial; an analog completed phase 1. Mouse doses per kilogram are far above what anyone injects.
Dosage5 to 10 mgFrequencytwo to three times per weekRouteSubcutaneous, Intramuscular - 6Full guideGHK-CuWell researched
Plasma levels fall sharply between 20 and 60, and topical use has controlled trials for photoaged skin. That is skin aging, not lifespan. Injectable use for systemic effects has no human data.
Dosage1 to 2 mgFrequencyonce daily (injectable); once or twice daily (topical)RouteSubcutaneous, Topical, Intramuscular
If you want the pick with the most evidence, it is SS-31, with the caveat that the evidence is for a rare disease at four to eight times the dose people use. If you want the pick with the best cost to risk ratio, it is an oral NAD+ precursor, which is not a peptide and not an injection. Epithalon is the compound people mean when they say longevity peptide, and it is a 10 to 20 day course once or twice a year with a thin human record. Thymosin alpha-1 earns a place for older adults whose immune response is the weak point. Sleep, training, protein and not smoking still outrank everything here, and the compounds are an educational topic rather than a plan.
Dosage at a glance
What appears in research and community protocols for each pick. Every number links to the full protocol table and calculator on the compound page.
| Peptide | Dosage | Frequency | Route | Cycle | First effects |
|---|---|---|---|---|---|
| SS-31 | 5 to 10 mg | once daily | Subcutaneous, Intravenous | 4 to 8 weeks | clinical endpoints were measured over weeks to months; community reports of better energy within 1 to 2 weeks are unverified |
| Thymosin Alpha-1 | 0.5 to 1.6 mg | twice weekly, up to daily in short acute protocols | Subcutaneous | 4 to 12 weeks in community use; 6 months in the hepatitis B labeling | nothing to feel in the first weeks; immune markers and infection frequency are judged over 2 to 6 months |
| NAD+ | 50 to 100 mg per injection | daily or a few times per week for injections; IV infusions weekly to monthly | Subcutaneous, Intramuscular, Intravenous, Oral | ongoing or blocks of several weeks | flush or fatigue 20 to 60 minutes after injection, energy later that day for some; anything cumulative takes 2 to 4 weeks and is subjective |
| Epithalon | 5 to 10 mg | once daily | Subcutaneous, Intramuscular, Intranasal, Oral | 10 to 20 days per course | sleep changes and vivid dreams within the first week; anything else is not measurable at home |
| MOTS-c | 5 to 10 mg | two to three times per week | Subcutaneous, Intramuscular | 4 to 8 weeks | energy and workout endurance reports over 2 to 4 weeks, body composition changes at 6 to 8 weeks if they happen at all |
| GHK-Cu | 1 to 2 mg (injectable); 0.5 to 3 percent (topical) | once daily (injectable); once or twice daily (topical) | Subcutaneous, Topical, Intramuscular | 4 to 8 weeks injectable; topical use is ongoing | wound and scar changes 2 to 4 weeks, skin texture and firmness 6 to 12 weeks, hair 3 to 6 months |
Side effects to expect
- ▲Injection site redness, itching, swelling or small lumps
- ▲Headache
- ▲Dizziness
- ▲Injection site redness, soreness or small lumps
- ▲Mild muscle aches or fatigue for a day after a dose
- ▲Low grade fever or chills in a small minority
- ▲Stinging, redness, or swelling at the injection site
- ▲Flush, chest tightness, cramping, and nausea, mainly with fast IV infusion
- ▲Transient fatigue or a flu-like feeling after injection
- ▲Vivid dreams
- ▲Drowsiness or fatigue during the course
- ▲Injection site reactions
- ▲Injection site redness, itching or small lumps
- ▲Transient fatigue or flushing after a dose
- ▲Temporary drops in blood glucose
- ▲Injection site stinging, redness and bruising, very common above 2 mg per mL
- ▲Skin irritation or a rash from topical products, more likely with high copper content
- ▲Temporary nausea or metallic taste after injection
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Best peptides for longevity: frequently asked
What is the best peptide for anti-aging?
By evidence, SS-31, because elamipretide has been through more human trials than anything else in the category and holds an FDA accelerated approval for Barth syndrome. By reputation, Epithalon, which has the telomerase and mouse lifespan findings but almost no independent human data. Neither has been shown to slow aging in a person. For skin specifically, GHK-Cu has the controlled trials; see best peptides for skin.
Does Epithalon really lengthen telomeres?
In cultured human fibroblasts, in a 2003 study from the Khavinson group, yes. In a living adult, nobody has measured it in a controlled trial. The commonly cited protocol is 5 to 10 mg daily by injection for 10 to 20 days, once or twice a year, which mirrors the Russian course structure. Vivid dreams and deeper sleep are the only effects most people notice, which fits the melatonin rhythm findings in animals.
Is NAD+ a peptide, and do injections work?
No, it is a coenzyme made of two nucleotides, grouped with peptides only because it is sold as a lyophilized powder and injected the same way. Injected NAD+ probably gets broken down to precursors before cells use it, so its advantage over an oral NR or NMN capsule, which have controlled trials showing raised blood NAD+, is not established. The pairing people inject it with is covered at the NAD+ and glutathione stack.
What is the difference between MOTS-c and SS-31?
Both target mitochondria from different directions. MOTS-c is a signal encoded in mitochondrial DNA that acts on muscle metabolism, with mouse data and no human trial of the native peptide. SS-31 binds cardiolipin in the inner mitochondrial membrane to stabilize energy production, with a substantial human trial record as elamipretide. They are often stacked; the comparison is at MOTS-c vs SS-31 and the stack at the MOTS-c and SS-31 stack.
Are longevity peptides safe?
The honest answer is that long term safety is unknown for all of them, because none has been run for years in healthy people under observation. Epithalon activates telomerase, which most cancers depend on, though mouse data showed fewer tumors. SS-31 and NAD+ cause injection site reactions and flushing. Thymosin alpha-1 has the best safety record of the group across thousands of trial patients. The general question is covered at are peptides safe.
Related reading
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Immune support and chronic infection
Two injectables sold alongside peptides that are not really peptides. What does each one do?
Two mitochondrial peptides, usually run together. What does each one actually do?
Same first name, nothing else in common. Which thymosin do you actually want?
Dosage