The other.

Octreotide is a synthetic octapeptide analogue of the natural hormone somatostatin, FDA-approved for the treatment of acromegaly, carcinoid tumor-related diarrhea, and vasoactive intestinal peptide-secreting tumors (VIPomas).

PACAP (Pituitary Adenylate Cyclase-Activating Polypeptide) is a highly conserved neuropeptide belonging to the VIP/secretin/glucagon superfamily.

Peptide YY (PYY) is a 36-amino acid endogenous gut hormone released from L-cells of the distal intestine in proportion to caloric intake.

Polymyxin B is a cyclic lipopeptide antibiotic produced by Paenibacillus polymyxa, used as a last-resort treatment for multidrug-resistant gram-negative infections.

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

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.

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.

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.

Collagen dipeptides, principally Pro-Hyp (Prolyl-Hydroxyproline) and Hyp-Gly (Hydroxyproline-Glycine), are the primary bioavailable fragments generated during digestion of hydrolyzed collagen supplements.

Cortistatin is a neuropeptide belonging to the somatostatin family, existing in three biologically active isoforms: CST-14, CST-17, and CST-29.

Desmopressin (DDAVP) is a synthetic analogue of the endogenous posterior pituitary hormone arginine vasopressin (AVP), modified at two positions: deamination of the N-terminal cysteine (1-desamino) and substitution of L-arginine with D-arginine at position 8.

Dulaglutide is a once-weekly injectable GLP-1 receptor agonist developed by Eli Lilly and FDA-approved in 2014.