Evidence guide
Peptides for longevity: what has evidence, and what does not
Last updated August 24, 2026 · 12 peptides graded
Here is the honest answer most pages will not give you: no peptide has been shown in a randomized human trial to extend lifespan or slow aging. Not one on this list. What the good ones have is human evidence for something else - a rare disease, an immune condition, body composition - that marketers then stretch into an anti-aging story. Below, each peptide is graded on how strong its human evidence actually is, with a plain note on what it has really been shown to do. The grade is about evidence, not hype, and it links straight to the cited studies.
How we grade
The grade rates the strength of the human evidence base for each peptide, for any use at all - not how heavily it is marketed. A high grade means real human trials exist; it does not mean the peptide is proven for longevity, because none here is. Every grade links to the cited studies on that compound's reference page.
- Approved drug
- An approved prescription drug somewhere, with real human trials - but read the indication, because it is not longevity.
- Human trials
- Studied in randomized human trials for some use, though not for aging or lifespan.
- Limited human data
- Some human data exists, but it is narrow, old, or for a use other than longevity.
- Preclinical only
- Evidence is essentially animal or test-tube only; human efficacy data is absent or minimal.
- Thin / single-group
- Evidence comes from a single research group or gets conflated with a different compound.
Approved drug
2What it is actually shown for: Approved in 2025 as Forzinity to improve muscle strength in Barth syndrome, a rare mitochondrial disease. It is the first mitochondria-targeted drug, but it also failed its mitochondrial-myopathy and dry-AMD trials.
Human longevity evidenceNone. It was never studied for aging, and a rare-disease approval is not evidence it helps healthy people age slower.
The most legitimate molecule here by a wide margin, and still no reason to treat it as a longevity drug.
Read the cited reference ->What it is actually shown for: FDA-approved (Egrifta) to reduce excess visceral abdominal fat in HIV patients with lipodystrophy. Its label explicitly says it is not for general weight loss.
Human longevity evidenceNone. Its human trials measured belly-fat volume in one specific patient group, not aging or lifespan.
Real, approved, narrowly useful - and the growth-hormone-axis story people build on top of it for anti-aging is not what it was approved for.
Read the cited reference ->Human trials
2What it is actually shown for: Approved in over 30 countries (not the US) for hepatitis B and C and as an immune adjunct. Many small older trials are positive, but the largest, most rigorous recent trial (a 2025 sepsis phase 3, over 1,000 patients) found no mortality benefit.
Human longevity evidenceNone. It is an immune modulator studied in infection and cancer settings, not an aging intervention.
Genuine human data, but it is mixed and pointed at immune conditions - the longevity framing is borrowed, not earned.
Read the cited reference ->What it is actually shown for: A non-peptide growth-hormone secretagogue studied by Merck in real randomized trials. In healthy older adults, 25 mg/day for up to two years raised lean mass and IGF-1 but did not improve strength or physical function, and it can raise blood sugar.
Human longevity evidenceNone, and arguably negative: the two-year trial showed the functional benefits people want did not materialize.
The rare case with long human data, and that data is a caution, not a green light.
Read the cited reference ->Limited human data
2What it is actually shown for: Formerly FDA-approved (as Geref) to test growth-hormone reserve and to treat childhood GH deficiency, then discontinued in 2008. Adult anti-aging use is off-label and rests on the GH-axis rationale, not on outcome trials.
Human longevity evidenceNone. Its approvals were diagnostic and pediatric; no trial shows it slows aging in adults.
A real drug with a real history, now sold for a use it was never approved or tested for.
Read the cited reference ->What it is actually shown for: A natural copper-binding peptide with genuine human data for skin, applied topically: increased collagen and improved skin appearance in cosmetic studies. Blood levels do fall with age.
Human longevity evidenceNone for injected, whole-body anti-aging. The credible human evidence is topical and cosmetic, not systemic longevity.
The skin science is real; the leap from a face cream ingredient to an injectable longevity peptide is not.
Read the cited reference ->Preclinical only
5What it is actually shown for: A growth-hormone-releasing hormone analog that does raise GH and IGF-1 in short human pharmacology studies. There are no human outcome trials showing it changes body composition, function, or health over time.
Human longevity evidenceNone. Raising a hormone level on a blood test is not the same as a proven benefit.
It moves a number; whether that helps anyone live better or longer is untested in humans.
Read the cited reference ->What it is actually shown for: A selective growth-hormone secretagogue notable in early studies for releasing GH without spiking cortisol or prolactin. Human evidence is limited to short pharmacology work, not outcome trials.
Human longevity evidenceNone. No trial has tested it for aging, body composition over time, or lifespan.
Cleaner on paper than older GH peptides, with the same missing piece: no human outcomes.
Read the cited reference ->What it is actually shown for: Widely reported healing effects on tendon, gut, and nerve tissue - almost entirely in rats and dogs. Human clinical evidence is essentially absent, and it is one of the peptides the UK's MHRA named while investigating clinic claims.
Human longevity evidenceNone. There is no human efficacy trial for healing, let alone for aging.
A striking animal record and a near-empty human one; treat the confident claims accordingly.
Read the cited reference ->What it is actually shown for: A synthetic fragment of thymosin beta-4 studied for tissue repair in animals. Human trials exist only for the full parent molecule (an IV safety study and dry-eye drops), not for the injected TB-500 fragment people actually use.
Human longevity evidenceNone. The human data is for a different molecule and a different use.
The evidence people cite is animal, or is about thymosin beta-4, not about injecting TB-500.
Read the cited reference ->What it is actually shown for: A mitochondrial-derived peptide with genuinely interesting human biology (it rises with exercise, falls with age), but every claim that injecting it improves metabolism or performance comes from mouse studies. A human trial is only now recruiting.
Human longevity evidenceNone yet. The endogenous biology is documented; the injected-drug benefits are animal-only so far.
The most scientifically interesting early story here, and still pre-human on every functional claim.
Read the cited reference ->Thin / single-group
1What it is actually shown for: Telomerase and lifespan claims that trace almost entirely to one Russian research group, in cell cultures and animals. The famous human mortality data actually studied Epithalamin, a different natural pineal extract, not the synthetic Epitalon peptide.
Human longevity evidenceNone that holds up. No controlled human trial of the synthetic peptide exists, and the human data cited for it is about another compound.
The peptide marketed hardest for longevity has the weakest evidence on this entire page - that inversion is worth sitting with.
Read the cited reference ->What about NAD+, rapamycin, and the rest?
The two names people ask about most are not peptides, so they sit outside this guide, but the honest read is worth stating. Injected NAD+ is the most-hyped longevity shot and has no randomized trial showing it slows aging; a 2026 review of more than a hundred studies found no outcome trials of the intravenous form. Rapamycin is a real drug with a serious longevity research program, but its most-watched healthy-aging trial missed its primary endpoint, and it is not a peptide either. The pattern holds across the whole space: the further a compound gets from a controlled human trial, the louder the anti-aging marketing tends to get.
Read on
Pepteca is for education and information only. It does not provide medical advice, diagnosis, or treatment, and its calculators perform unit math only. Always verify with a licensed provider before starting, changing, or stopping any protocol. Many peptides are not approved for human use and may be regulated differently where you live.