The Science

Research peptides, described honestly.

Peptides are short chains of amino acids — fragments of the proteins your cells are built from. As signaling molecules they are studied across a wide range of biology, and the research maturity varies enormously by compound. We group the catalog by research area and describe each one in neutral terms.

Our scope: Pepthea supplies reference peptides for in-vitro laboratory research and development only. Nothing here is a drug, supplement, cosmetic, or food; we make no medical or performance claims, and we don't provide human dosing. Where a compound's evidence is mostly preclinical, we say so.

Metabolic (GLP-1 / incretin)

Active research area

Incretin-receptor agonists such as semaglutide, tirzepatide, and retatrutide are studied in metabolic-signaling, appetite, and energy-balance models. These are reference compounds for in-vitro and preclinical work only.

Recovery & tissue repair

Widely used tool compounds

BPC-157, TB-500 (thymosin β4), and KPV appear across connective-tissue, angiogenesis, and inflammation research. Evidence is largely preclinical; they are used as laboratory tool compounds, not therapeutics.

Growth-hormone axis

Established secretagogues

Secretagogues (ipamorelin) and GHRH analogs (CJC-1295, sermorelin) are standard tools in pituitary and GH-pulse research.

Neuro & nootropic

Neurotrophic models

Semax, Selank, and Cerebrolysin are studied in neurotrophic-factor, cognition, and mood research models.

Sleep & circadian

Chronobiology models

DSIP, Epithalon, and melatonin are used in sleep-architecture and circadian-regulation research.

Longevity & cellular

Emerging research

NAD+, MOTS-c, and SS-31 are studied in mitochondrial-function, redox, and cellular-aging models.

Immune modulation

Immunology tools

Thymosin α1, Thymalin, and VIP are used in T-cell, innate-immune, and neuroimmune research.

Reproductive & melanocortin

Endocrine models

PT-141, Kisspeptin-10, and Gonadorelin are reference peptides in reproductive-endocrine and melanocortin-signaling research.

Skin biology

Cosmetic-science research

GHK-Cu, Snap-8, and Matrixyl are studied in collagen-signaling and skin-matrix research models.

Purity is the product.

A research peptide is only as good as its identity and purity. Every Pepthea lot is third-party tested by HPLC (purity) and mass spectrometry (identity), and the certificate of analysis is published under the lot number printed on the vial. If a lot's COA isn't posted, it isn't shipping.

See how we test

Areas at a glance: 9 research categories in the catalog.