Peptide Library

Plain-language primers on the peptides people actually talk about — what each one is, how it works, and what the evidence really shows.

Educational summaries. Not medical advice, not a recommendation to use any compound.

★ Most talked-about

Semaglutide

Clinical evidence

The once-weekly GLP-1 that turned 'food noise' into a household phrase.

Tirzepatide

Clinical evidence

The dual GLP-1/GIP drug that made semaglutide look like last year's model.

Retatrutide

Clinical evidence

A triple-target experimental drug producing bariatric-surgery levels of weight loss — still awaiting approval.

Liraglutide

Clinical evidence

The daily GLP-1 that proved the whole idea, then got outshone by its weekly successors.

BPC-157

Preclinical

The repair peptide everyone in the gym talks about — powerful in rats, still unproven in humans.

TB-500

Preclinical

Not the whole protein — just its active 7-amino-acid fragment, sold to racehorses before athletes.

NAD+

Clinical evidence

The longevity industry's biggest seller is actually a coenzyme in every cell, and most of the IV-drip promise rests on thin evidence.

GHK-Cu

Limited human data

A copper-carrying peptide from young blood in 1973 that still anchors today's anti-aging serums.

Ipamorelin

Limited human data

The cleanest growth-hormone releaser ever designed — it nudges GH without dragging cortisol along.

CJC-1295

Limited human data

Two different molecules share this name — one lasts a week, the other clears in 30 minutes.

Sermorelin

Limited human data

The only GHRH analog the FDA ever approved — and then quietly nobody kept selling it.

Tesamorelin

Clinical evidence

The only GHRH analog with full FDA approval — and one of the few tools that targets deep belly fat on purpose.

SS-31 (Elamipretide)

Clinical evidence

The first mitochondria-targeting peptide to win FDA approval, for one ultra-rare disease, while its broader longevity story stays a hope.

Glutathione

Clinical evidence

The body's own master antioxidant, often sold for skin whitening, where the real story is route, delivery, and overclaimed wellness endpoints.

Oxytocin

Clinical evidence

A Nobel-winning 'love hormone' — a standard-of-care drug in obstetrics, and an unproven social elixir everywhere else.

Insulin

Clinical evidence

The 'peptide everyone knows' — a lifesaver for diabetes, and a dangerous tool that has no proven muscle-building record.

Human Growth Hormone (HGH)

Clinical evidence

A 40-year-old approved drug whose off-label anti-aging life has run far ahead of its evidence.

Selank

Clinical evidence

A Russian anxiolytic that held its own against a benzodiazepine in trials — without the fog.

Semax

Clinical evidence

A Russian cognitive peptide with more human data than almost any nootropic — approved there for stroke since 2011.

Metabolic & weight loss

Cagrisema

Clinical evidence

Novo's bet on 25% weight loss landed at 22.7% and lost the head-to-head — still the number-two drug in its class.

Orforglipron

Clinical evidence

The first GLP-1 weight-loss drug you can just swallow, approved by the FDA in 2026.

Survodutide

Clinical evidence

A weight-loss drug that pairs the appetite hormone with the blood-sugar-raising one — and shows a striking effect on the liver.

Mazdutide

Clinical evidence

The GLP-1/glucagon dual agonist that reached approval in China ahead of its Western rivals.

Cagrilintide

Clinical evidence

A long-acting copy of the fullness hormone amylin — a second appetite mechanism that is not another GLP-1.

Eloralintide

Clinical evidence

Eli Lilly's copy of the fullness hormone amylin, showing a remarkable 20% weight loss from a mechanism that skips GLP-1 entirely.

Healing & recovery

KLOW

Community reports

Four peptides in one vial, zero trials on the combination — clinic logic packaged for convenience.

BPC-157 + TB-500 Blend

Preclinical

The 'wolverine stack' — two repair mechanisms in one vial, a decade of folklore and zero controlled trials.

KPV

Preclinical

The anti-inflammatory tail of a pigmentation hormone, stripped of the side effects, with strong lab logic but almost no human trials.

Thymosin α-1

Clinical evidence

A genuinely approved drug abroad for hepatitis, sold in the US as a generic immune boost for uses backed only by extrapolation.

TB-500 Fragment

Preclinical

The actin-binding engine of TB-500 sold as a substitute at a sixth of the cost, where the engine works but the missing parts matter.

Larazotide

Clinical evidence

The most advanced attempt yet to keep the gut lining tight — a promising idea that failed its final test.

GHK-Cu + BPC-157 Blend

Mixed evidence

The repair stack that splits the job: one peptide rebuilds the surface, the other works on the structure underneath.

BPC-157 + KPV Blend

Mixed evidence

A gut-repair pairing: BPC-157 rebuilds the tissue while KPV quiets the inflammation feeding the damage.

Cibinetide

Mixed evidence

A fragment of erythropoietin designed to protect injured tissue without making red blood cells — elegant in animals, disappointing in people.

VIP

Mixed evidence

A natural peptide your body already makes — with a real approved use and a long string of claims that never made it to trial.

Growth hormone / muscle

CJC-1295 + Ipamorelin Blend

Community reports

The growth-hormone stack peptide clinics built their practice on — textbook receptor pairing, no trial to match.

HGH Frag 176-191

Limited human data

The supposed fat-burning end of growth hormone, isolated and sold freely, even though the upgraded version already failed in human trials.

GHRP-2

Clinical evidence

It reliably releases growth hormone, but so does ipamorelin, without the cortisol, prolactin, and hunger that come along with this one.

GHRP-6

Clinical evidence

The original ghrelin mimic, dominant in 2005 but largely replaced by cleaner options by 2015, yet still on shelves for its appetite effect.

AOD 9604

Clinical evidence

The best-studied fat-burning fragment was tested honestly in full clinical trials and lost.

IGF-1 LR3

Mixed evidence

Engineered to escape the body's natural brakes on a growth signal, it builds muscle while raising one of the cleanest cancer-risk flags in epidemiology.

Follistatin 344

Preclinical

A muscle-gene blocker with genuine science behind it, but no human performance trials, a broad off-target profile, and a market full of questionable vials.

Tesamorelin + Ipamorelin Blend

Mixed evidence

A growth-hormone stack with one FDA-approved half and a selective signal from the other.

Sermorelin + GHRP-2 Blend

Mixed evidence

The early growth-hormone stack — the receptor logic is textbook, but one of its two halves is the dated version.

Testosterone

Clinical evidence

The male sex hormone — a reference compound with ninety years of use, and the odd one out on a peptide board.

Hexarelin

Community reports

A potent GH-releasing peptide — strong hit, but it desensitizes and is less 'clean.'

MK-677 (Ibutamoren)

Community reports

The oral GH enhancer — take a pill, sustain elevated GH and IGF-1 for a full day.

Cognitive & brain

Pinealon

Preclinical

A smaller, less-studied sibling of epithalon marketed as a brain peptide, with promising lab results and essentially no human data.

Dihexa

Preclinical

A rodent memory molecule its developer's own company passed on, with a cancer-relevant mechanism that makes the risk real.

PE 22-28

Preclinical

A seven-amino-acid fragment studied as an antidepressant — in mice, by one lab, never in a human.

Cerebrolysin

Clinical evidence

A pig-brain extract studied in thousands of patients for stroke and dementia — with real early signals that fade over time.

Adamax

Community reports

A supposedly improved version of Semax — but the molecule has never been tested, and its record is completely empty.

Bromantane

Limited human data

A Russian actoprotector that boosts dopamine synthesis — not a peptide, but a unique nootropic with real human data.

Longevity & cellular

MOTS-c

Preclinical

A peptide your mitochondria make that rose and fell with age in mice, finally beginning its first human tests.

Epithalon

Preclinical

A Russian pineal-gland peptide sold as a lifespan extender on the strength of one lab's single unreplicated human study.

Humanin

Preclinical

The first peptide ever found hiding inside mitochondrial DNA, with strong protective biology and zero human trials.

Vilon

Community reports

Two amino acids sold for anti-aging, with decades of promotion but no registered clinical trial under its own name.

Thymalin

Community reports

A calf-thymus extract with decades of clinical reporting — and not one study you can look up in a registry.

FOXO4-DRI

Preclinical

The peptide for clearing out 'zombie' cells — deep-research territory, huge longevity buzz.

Energy & mitochondria

SLU-PP-915

Preclinical

The exercise-mimetic redesigned so that you can swallow it instead of injecting it into a mouse.

Skin & beauty

Melanotan II

Limited human data

Invented to prevent skin cancer in the 1980s, sold on TikTok in the 2020s as a tanning drug.

GLOW

Community reports

The cosmetic-first cousin of KLOW — three peptides aimed at skin and recovery, weighted toward GHK-Cu.

Melanotan I

Clinical evidence

A real FDA-approved drug for a rare sun-intolerance disease, sold at the same time as a gray-market tanning shot that is not the approved product.

AHK-Cu

Preclinical

A copper peptide riding on its famous cousin's reputation to back hair-growth claims it cannot fully support.

Snap-8

Mixed evidence

Marketed as 'topical Botox,' it is an eight-amino-acid skincare peptide fighting an uphill battle to reach the muscle through your skin.

Sleep & recovery

DSIP

Limited human data

A fifty-year-old sleep peptide with genuine and reproducible effects for some people, and still no confirmed receptor or modern protocol.

Sexual health

HCG

Clinical evidence

A pregnancy hormone with rock-solid fertility uses, a debunked diet afterlife, and a big off-label TRT role.

PT-141 (Bremelanotide)

Clinical evidence

An accidental sex peptide: the tanning-drug team kept noticing everyone got erections.

Kisspeptin-10

Limited human data

The master switch for the entire reproductive system — a clean signal, still in phase 2.

Gonadorelin

Clinical evidence

A Nobel-winning reproductive hormone with a real clinical past, asked to do a job HCG usually does cleaner.

Triptorelin

Mixed evidence

A long-acting prostate-cancer drug that some communities reinvented as a single-shot hormone restart, resting on a thin anecdote.

Tadalafil

Clinical evidence

The long-acting erection pill that also treats enlarged prostate and a form of high blood pressure in the lungs.

Research & peptides

5-Amino-1MQ

Preclinical

A pre-clinical lab molecule that reached the gray market years ahead of any human study, promoted hardest by the people selling it.

SLU-PP-332

Preclinical

A lab molecule that switches on your cells' endurance-exercise program in mice and reached the market years before any human trial.

Brenipatide

Limited human data

An incretin-class peptide being tested not for weight loss but for addiction — a question the field is watching closely.