The directory.

Secretin is a 27-amino acid gastrointestinal hormone produced by S-cells of the duodenum in response to acidic chyme.

Semaglutide is a long-acting synthetic analog of glucagon-like peptide-1 (GLP-1), an incretin hormone naturally secreted by intestinal L-cells in response to food intake.

Sermorelin is the shortest fully functional fragment of growth hormone-releasing hormone (GHRH), consisting of the first 29 amino acids.

Somatostatin is an endogenous cyclic peptide existing in 14-amino acid (SST-14) and 28-amino acid (SST-28) isoforms.

Substance P is an 11-amino acid neuropeptide belonging to the tachykinin family, with the sequence Arg-Pro-Lys-Pro-Gln-Gln-Phe-Phe-Gly-Leu-Met-NH2.

Teriparatide is a recombinant form of the first 34 amino acids of human parathyroid hormone (PTH 1-34) and the first anabolic osteoporosis treatment approved by the FDA.

Tesamorelin is a synthetic GHRH analog that is FDA-approved (as Egrifta) for the treatment of HIV-associated lipodystrophy (excess abdominal fat).

Thymosin Alpha-1 (Tα1) is a 28-amino-acid peptide originally isolated from thymic tissue and now produced synthetically.

Tirzepatide is a synthetic once-weekly injectable peptide developed by Eli Lilly that simultaneously activates two incretin hormone receptors — the glucose-dependent insulinotropic polypeptide (GIP) receptor and the glucagon-like peptide-1 (GLP-1) receptor.

Vasopressin (Vasostrict) is an FDA-approved synthetic form of the endogenous nonapeptide antidiuretic hormone (ADH) produced by the hypothalamus.

Vasoactive Intestinal Peptide (VIP) is a 28-amino acid endogenous neuropeptide found throughout the central and peripheral nervous systems and gut.

Adamax is a synthetic neuropeptide combining the N-acetyl Semax backbone with an adamantyl modification derived from P21, another BDNF-potentiating nootropic.

Angiotensin II is an endogenous octapeptide and the primary effector of the renin-angiotensin-aldosterone system (RAAS).

Nesiritide (Natrecor) is an FDA-approved recombinant human B-type natriuretic peptide (BNP-32) structurally identical to the endogenous cardiac hormone.

Aviptadil (RLF-100) is a synthetic form of human vasoactive intestinal peptide (VIP), a 28-amino acid neuropeptide naturally produced throughout the lungs, gut, and nervous system.

Bradykinin is an endogenous nonapeptide generated from kininogens by the enzyme kallikrein.

Buserelin is a synthetic GnRH agonist peptide widely approved in Europe, Canada, and other regions under brand names including Suprefact and Suprecur for prostate cancer, endometriosis, and female infertility.

Cagrilintide is a long-acting synthetic amylin analog developed by Novo Nordisk, designed for once-weekly subcutaneous dosing.

Cathelicidins are a family of endogenous antimicrobial peptides characterized by a conserved N-terminal cathelin domain and a variable C-terminal antimicrobial peptide.

Cecropins are a family of linear antimicrobial peptides originally isolated from the hemolymph of the silk moth Hyalophora cecropia.