Ranked by: strength of human evidence — grade A first, D last. Never by commission.
A stabilized analog of the full 44-amino-acid human growth hormone-releasing hormone (GHRH), FDA-approved to reduce excess visceral abdominal fat in people with HIV-associated lipodystrophy. It is also prescribed off-label for general fat loss and anti-aging purposes, a use with a much thinner evidence base than the approved indication.
A 29-amino-acid fragment of human growth hormone-releasing hormone (GHRH) that stimulates the pituitary to make and release its own growth hormone, rather than supplying GH directly. It was an FDA-approved drug for two decades under the brand name Geref; that product was discontinued for commercial reasons in 2008, and today's supply is almost entirely compounded.
A melanocortin-receptor agonist peptide. As the branded drug Vyleesi, a subcutaneous autoinjector, it is FDA-approved for acquired generalized hypoactive sexual desire disorder in premenopausal women. Sold separately online as unbranded "PT-141" — often as a nasal spray or vial, and often marketed to men — in a form and use that is not approved.
The shortest active fragment of the reproductive neurohormone kisspeptin, a potent agonist at the GPR54 receptor on GnRH neurons that triggers the hormonal cascade behind puberty, fertility and libido — genuinely one of the better human-trial-backed research peptides, but sold online as an unregulated 'research use only' injectable with no approved use, no outcome trial, and no long-term safety data.
A naturally occurring copper-binding tripeptide present in human plasma that declines with age, sold as a cosmetic ingredient in skincare serums and creams under names like 'copper peptide.'
A synthetic fragment of adrenocorticotropic hormone (ACTH) with the corticotropic activity removed, developed in Russia and sold there as a prescription nasal spray for stroke recovery and cognitive complaints, and sold online elsewhere as an unregulated nootropic.
A synthetic peptide related to the immune peptide tuftsin, developed in Russia and approved there as a prescription anxiolytic nasal spray, sold elsewhere online as an unregulated anti-anxiety and cognitive research chemical.
A naturally occurring nine-amino-acid peptide first isolated from rabbit brain in the 1970s and studied in small human trials since the 1980s for sleep and hormonal effects, sold online today as an unregulated sleep-support research peptide.
A synthetic tetrapeptide developed by a pharmaceutical company (Stealth BioTherapeutics) specifically to target mitochondrial cardiolipin and improve energy production, tested in a genuine Phase 3 human trial program for mitochondrial disease — which failed to beat placebo on its primary clinical endpoints, even though a separate smaller trial showed it improves a mitochondrial energy biomarker in healthy older adults.
A synthetic 15-amino-acid peptide derived from a fragment of a human gastric protein, sold online for injury recovery and gut healing.
A synthetic analog of growth hormone-releasing hormone (GHRH), engineered to resist the rapid breakdown that limits natural GHRH and sermorelin. It is not an FDA-approved drug and is sold online as a research chemical, not for human use. Two distinct products share this name and must not be confused with each other: a long-acting version bound to a Drug Affinity Complex (DAC), and a short-acting version without it.
A synthetic five-amino-acid peptide that activates the ghrelin receptor to trigger growth hormone release, often sold combined with CJC-1295 as a 'GH-boosting stack.' It is not an FDA-approved drug and is sold as a research chemical, not for human use.
A synthetic four-amino-acid peptide designed to mimic Epithalamin, a peptide complex extracted from the pineal gland, studied by Russian researchers for telomerase activation and lifespan effects and sold online as an anti-aging injectable, with no approval for human use anywhere.
A 16-amino-acid peptide encoded within mitochondrial DNA that acts as a hormone-like signal for metabolism and stress response, an active area of current metabolic research sold online as an injectable 'exercise mimetic' peptide with no completed human dosing trial behind it.
A synthetic version of a naturally occurring 43-amino-acid protein, sold online as an injectable "research chemical" marketed for tendon, ligament and muscle injury recovery, often alongside BPC-157.
A synthetic analogue of alpha-melanocyte-stimulating hormone, injected to darken skin without sun exposure. Sold online and through gray-market tanning and wellness sources for tanning and, off-label, for libido and erectile function.
A modified fragment of the C-terminal end of human growth hormone, engineered to isolate growth hormone's fat-metabolising effect without its growth-promoting or blood-sugar effects. Sold online as an injectable peptide marketed for fat loss.
BPC-157, TB-500, MOTS-c, CJC-1295, ipamorelin, sermorelin and tesamorelin ranked on human trials for energy and recovery — most have none in humans.
Read the guide →Approved peptides tesamorelin and PT-141 rank safest with Phase 3 trial data; unregulated injectables like BPC-157 and TB-500 have no human trials at all.
Read the guide →GHK-Cu applied to skin is the only peptide with a measured repair effect in human trials; every other anti-ageing peptide has just animal or cell data.
Read the guide →No longevity peptide has human lifespan-extension evidence; ranked on animal data for epitalon, MOTS-c, SS-31, humanin and the GH-axis peptides.
Read the guide →Topical GHK-Cu ranks first for beginners — over the counter, human-trial evidence, no injection — well ahead of unregulated injectables like BPC-157.
Read the guide →Only tesamorelin and PT-141 are doctor-recommended within actual guidelines; clinic-menu peptides like BPC-157 can't be lawfully compounded and lack trials.
Read the guide →GHK-Cu (copper peptide) leads on human evidence for wrinkles, but every topical peptide still ranks below daily sunscreen and prescription retinoids.
Read the guide →Tesamorelin has multiple Phase 3 human trials, the most clinically studied longevity peptide; BPC-157, TB-500 and epitalon have no completed human trial at all.
Read the guide →Choosing longevity peptides safely starts with what problem it treats and whether a lawful route exists, which eliminates most of the market immediately.
Read the guide →The evidence-based longevity peptide stack contains at most one peptide; the marketed 'healing' and 'anti-ageing GH' stacks add interaction risk, not benefit.
Read the guide →GLP-1 peptides rank highest for longevity, backed by outcome trials — growth hormone peptides, BPC-157, and NAD+ infusions rank far lower on human evidence.
Read the guide →Longevity clinics prescribe peptides ranging from FDA-approved drugs to compounds with no human trials. Which is which, what supervision adds, and the risks.
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