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Peptide Directory — all peptides Peptide Basics Peptides by Goal Cosmetic Peptides Safety & Regulation Research Reviews News Skincare Buyer Guides About & editorial policy

The directory

Every peptide, explained simply.

A plain-English guide to 35+ peptides — from skincare ingredients to research chemicals to approved medicines. For each one we explain what it is, what it’s studied for, how strong the evidence really is, and whether it’s legal and safe. No hype, and no dosing or “how-to.”

Healing & Recovery

Peptides studied in the context of tissue repair, gut health, and recovery. Mostly early or animal research.

BPC-157

ResearchBody Protection Compound-157

Tissue, tendon, and gut healing

KPV

ResearchLysine-Proline-Valine

Calming inflammation, gut inflammation (IBD), and immune modulation

Larazotide

ResearchAT-1001

Tightening the gut lining ('leaky gut' / tight junctions)

LL-37

ResearchCathelicidin LL-37

Fighting microbes and helping wounds heal

TB-500

ResearchThymosin Beta-4 fragment

Tissue repair, wound healing, and injury recovery

Thymosin Alpha-1

Supporting and balancing the immune system

Metabolic & Weight

Includes approved GLP-1 medicines and experimental peptides linked to metabolism, blood sugar, and fat.

AOD-9604

ResearchAOD9604

Fat loss / weight (development stalled after weak trial results)

Cagrilintide

Weight loss and appetite control (often tested with semaglutide as 'CagriSema')

MOTS-c

ResearchMitochondrial ORF of the 12S rRNA type-C

Metabolism, insulin sensitivity, exercise / energy

Retatrutide

ResearchLY3437943

Obesity / weight loss and type 2 diabetes

Semaglutide

ApprovedOzempic

Type 2 diabetes and chronic (long-term) weight management

Tesamorelin

ApprovedEgrifta

Reducing excess belly fat in HIV-associated lipodystrophy

Tirzepatide

ApprovedMounjaro

Type 2 diabetes and weight management

Growth Hormone & Muscle

Peptides connected to growth-hormone pathways and muscle. Ranges from approved drugs to unapproved research chemicals.

CJC-1295

ResearchMod GRF 1-29 (no-DAC form)

Raising growth hormone / IGF-1, body composition, sleep

Follistatin-344

Blocking myostatin to allow more muscle growth

GHRP-2

ResearchGrowth Hormone Releasing Peptide-2

Triggering growth hormone release

GHRP-6

ResearchGrowth Hormone Releasing Peptide-6

Triggering growth hormone release

HCG

ApprovedHuman Chorionic Gonadotropin

Fertility treatment; certain male hormonal problems

Hexarelin

ResearchExamorelin

Triggering growth hormone release

IGF-1 LR3

ResearchLong R3 IGF-1

Muscle growth and cell growth

Ipamorelin

Growth hormone release, body composition, recovery, sleep

Sermorelin

Prompting the body to release its own growth hormone

Longevity & Cellular

Peptides and cofactors studied for ageing, cellular energy, and repair. Evidence is mostly preliminary.

Epitalon

ResearchEpithalon

Ageing, telomeres, and sleep

Humanin

Ageing, brain protection, and how the body handles energy

NAD+

SupplementNicotinamide adenine dinucleotide

Cellular energy, ageing, and DNA repair

SS-31

ResearchElamipretide

Mitochondrial disease, heart and eye conditions, cellular energy

Focus & Mood

Peptides studied for focus, stress, and mood — largely developed and researched outside the US.

Cerebrolysin

ResearchFPF-1070

Stroke, dementia, and traumatic brain injury

DSIP

ResearchDelta Sleep-Inducing Peptide

Sleep, and the body's stress and hormone systems

Selank

ResearchTuftsin analog

Anxiety, stress, and calm focus

Semax

ResearchACTH(4-10) analog

Focus, memory, neuroprotection, and stroke recovery

Sexual Health & Libido

Peptides linked to sex drive, arousal, and reproductive hormones — one is an approved medicine, the rest are research chemicals.

Gonadorelin

Fertility, hormone testing/diagnosis, and supporting the body's own sex-hormone signals

Kisspeptin

ResearchKisspeptin-54

Libido, arousal, and fertility

Melanotan-2

Tanning and libido

Oxytocin

ApprovedPitocin

Labor and breastfeeding (approved); bonding, anxiety, and social connection (research/off-label)

PT-141

ApprovedBremelanotide

Low sexual desire and arousal

Skin & Cosmetic

Peptides used topically in skincare — regulated as cosmetics and limited to claims about how skin looks. These have their own in-depth guides.

GHK-Cu (Copper Peptides)

The look of firmer, smoother skin

Matrixyl

The look of fine lines and firmness

Argireline

The look of softer expression lines

All cosmetic peptide guides

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