Reference · Peptides
Per-peptide reference, written by the lab.
Structure, CAS, formula, sequence, published mechanism, and the analytical methods we use to verify each peptide. Chemistry and verification only — no dosing, administration, or clinical guidance.
- Regenerative research peptides
BPC-157
Synthetic pentadecapeptide
BPC-157 is a synthetic 15-amino-acid sequence derived from a fragment of human gastric juice protein BPC. It is widely studied as a research compound in rodent models of tissue and tendon repair. Independent purity verification is critical because the sequence contains three consecutive prolines, a known difficult-coupling region during solid-phase synthesis.
View reference - Incretin analogs
Semaglutide
GLP-1 receptor agonist (lipidated peptide)
Semaglutide is a 31-residue GLP-1 analog modified at position 2 with α-aminoisobutyric acid (Aib) to resist DPP-4 cleavage and at Lys26 with a C18 fatty diacid linker that enables albumin binding and a prolonged plasma half-life. The molecule is a pharmaceutical reference compound; CertikLabs verifies identity, purity, and content of supplied material.
View reference - Incretin analogs
Tirzepatide
Dual GIP/GLP-1 receptor agonist (lipidated peptide)
Tirzepatide is a 39-residue synthetic peptide that activates both the GIP and GLP-1 receptors. Two α-aminoisobutyric acid (Aib) residues stabilize the backbone against DPP-4 cleavage, and Lys20 carries a γGlu-γGlu spacer linked to a C20 fatty diacid for albumin binding. CertikLabs verifies identity, purity, lipid-conjugation site, and content.
View reference - Regenerative research peptides
TB-500
Synthetic 43-residue peptide (thymosin β4)
TB-500 is the synthetic version of thymosin β4 (Tβ4), a 43-amino-acid actin-sequestering peptide. It is commonly supplied as the N-terminally acetylated full-length sequence and studied in preclinical models of wound healing, cardiac repair, and angiogenesis. Independent verification matters because the long backbone and Met residue at position 6 create characteristic SPPS and oxidation-derived impurities that a basic identity check will miss.
View reference - Copper peptides
GHK-Cu
Copper(II)-tripeptide complex
GHK-Cu is a 1:1 complex of the tripeptide Gly-His-Lys (GHK, CAS 49557-75-7) with copper(II). The free peptide GHK is a naturally occurring fragment of human collagen α2(I); when bound to Cu(II) it forms a square-planar chelate that is the active species in most published wound-healing and dermatological literature. CertikLabs verifies both the peptide identity and the stoichiometry of the copper complex.
View reference - Incretin analogs
Retatrutide
Triple GIP/GLP-1/glucagon receptor agonist (lipidated peptide)
Retatrutide is a 39-residue synthetic peptide that activates the GIP, GLP-1, and glucagon receptors. The backbone contains α-aminoisobutyric acid (Aib) substitutions to resist DPP-4 cleavage, and a lysine in the middle of the sequence carries a γGlu spacer linked to a C20 fatty diacid that drives albumin binding and a long plasma half-life. CertikLabs verifies identity, purity, lipid-conjugation site, and content of supplied material.
View reference - Growth hormone secretagogues
CJC-1295
GHRH(1-29) analog with albumin-binding DAC linker
CJC-1295 (with DAC) is a synthetic 30-residue analog of growth-hormone-releasing hormone (GHRH 1-29) with four amino-acid substitutions (D-Ala2, Gln8, Ala15, Leu27) for protease resistance and a C-terminal lysine bearing a maleimidopropionic acid (MPA) Drug Affinity Complex linker. The maleimide forms a covalent bond with the free cysteine of circulating serum albumin, extending the plasma half-life dramatically compared with the bare GHRH peptide.
View reference - Growth hormone secretagogues
Ipamorelin
Selective ghrelin (GHS-R1a) receptor agonist (pentapeptide)
Ipamorelin is a synthetic pentapeptide growth-hormone secretagogue with the sequence Aib-His-D-2-Nal-D-Phe-Lys-NH2 (C-terminal amide). It contains two non-natural residues — α-aminoisobutyric acid at the N-terminus and 3-(2-naphthyl)-D-alanine at position 3 — and a D-Phe at position 4, which together confer selectivity for the ghrelin receptor and protease resistance.
View reference - Melanocortin agonists
PT-141 (Bremelanotide)
Cyclic heptapeptide melanocortin receptor agonist
PT-141 (bremelanotide) is a synthetic cyclic heptapeptide derived from α-melanocyte-stimulating hormone (α-MSH). It is N-terminally acetylated and contains a lactam bridge between Asp and Lys side chains that locks the active core into a constrained β-turn. The molecule is the active pharmaceutical ingredient in an FDA-approved product for a specific clinical indication; CertikLabs verifies the chemistry of supplied material and does not publish clinical guidance.
View reference - Growth hormone secretagogues
Sermorelin
Synthetic 29-residue N-terminal fragment of human GHRH
Sermorelin is the synthetic 29-residue N-terminal fragment of human growth-hormone-releasing hormone (GHRH), supplied as the C-terminal amide. The 29-mer retains the full intrinsic GHRH-receptor agonist activity of the 44-residue native hormone. CertikLabs verifies identity, purity, and content; it does not publish dosing or clinical guidance.
View reference
Editorial scope
What we publish, and what we do not
CertikLabs reference pages cover peptide chemistry, manufacturing, analytical methods, and well-established published mechanism of action with citations. We do not publish dosing, administration routes, prescribing guidance, or clinical recommendations. Anything intended for human use must be obtained, prescribed, and administered by a qualified, licensed clinician.