The full library

Peptides A–Z

Every guide, comparison and tool on Chemdu in one place — clear, honest explanations of the peptides in skincare, supplements, medicine and the grey market, plus a free calculator.

Start here: the four categories

Cosmetic peptidesSkincare peptides — copper peptides, Matrixyl, Argireline and more.Explore → Dietary peptidesCollagen and bioactive food peptides you eat.Explore → Therapeutic peptidesPrescription medicines — insulin, GLP-1 weight-loss drugs and more.Explore → Research peptidesThe “research use only” grey market, explained honestly.Explore →

Individual peptide guides

Cosmetic (skincare)

GHK-Cu (copper peptide)The most-studied skincare peptide — firmness, repair, renewal.Read guide → MatrixylPalmitoyl signal peptides for collagen and wrinkles.Read guide → ArgirelineAcetyl hexapeptide-8, the “topical Botox” peptide.Read guide →

Dietary (supplements)

Collagen peptidesHydrolysed collagen for skin, joints, hair and nails.Read guide →

Therapeutic (prescription)

SemaglutideThe GLP-1 peptide behind Ozempic and Wegovy.Read guide → TirzepatideThe dual GIP/GLP-1 peptide behind Mounjaro and Zepbound.Read guide →

Research (grey market)

BPC-157The most-searched recovery peptide — honest safety picture.Read guide → TB-500Thymosin beta-4 fragment, explained honestly.Read guide → Melanotan I & IIThe “tanning injection” and its real risks.Read guide → IpamorelinGrowth-hormone secretagogue peptide.Read guide → CJC-1295GHRH-analogue peptide (DAC vs no-DAC).Read guide →

Comparisons

Semaglutide vs tirzepatideThe two leading weight-loss peptides, head to head.Compare → Ozempic vs WegovySame drug, different branding — what actually differs.Compare → Marine vs bovine collagenWhich collagen source is right for you.Compare → GHK-Cu vs MatrixylThe two most-studied skincare peptides.Compare → Peptides vs retinolGentle supporter vs proven heavyweight.Compare → BPC-157 vs TB-500The two big “recovery” research peptides.Compare →

Buyer guides

Best collagen for skinTop collagen peptide powders for skin, compared.See picks → Best collagen for jointsType II vs types I & III for joint support.See picks → Best marine collagenTop type-I fish collagen powders.See picks → Best copper peptide serumTop GHK-Cu serums to try.See picks → Best peptide eye creamTop picks for fine lines and firmness.See picks → Best peptides for wrinklesWhich peptides actually help fine lines.See picks → Best budget collagenAffordable collagen that still works.See picks →

Guides & tools

Peptide calculatorReconstitution, dose-to-syringe volume, and molecular weight from a sequence.Open tool → How to reconstitute peptidesStep-by-step guide with supplies and the calculator.Read guide → How to inject semaglutideStep-by-step technique, sites and supplies.Read guide → Semaglutide side effectsWhat to expect and how people manage them.Read guide → Semaglutide dosing scheduleHow the titration works, and missed doses.Read guide →

Popular peptide products

The most-reviewed picks across our guides — skincare and supplements available now:

Vital Proteins Collagen Peptides Market-leading grass-fed collagen peptides for skin, joints and hair. View on Amazon → Asterwood Copper Peptides (GHK-Cu) A simple, higher-strength copper-peptide face serum. View on Amazon → The Ordinary Matrixyl 10% + HA An affordable signal-peptide serum for fine lines and firmness. View on Amazon →

As an Amazon Associate, Chemdu may earn a commission from qualifying purchases, at no extra cost to you. These are example products for convenience, not medical or personal endorsements.

Not medical advice. Chemdu is an educational resource and does not sell, prescribe or supply any peptide. Always consult a licensed professional about supplements or medicines.