The proportion of a substance that enters the circulation when introduced into the body and is able to have an active effect. Different administration routes affect bioavailability.
"Bioavailability" is filed under Pharmacology in the PeptideAtlas glossary, alongside 29 other terms in that group.
The term applies directly to 39 compound profiles here: BPC-157 (evidence C), Semaglutide (evidence A), Tirzepatide (evidence A), PT-141 (evidence A), Tesamorelin (evidence A), Epithalon (evidence D), Selank (evidence D), Liraglutide (evidence A), and others. Each profile states the strength of the human evidence rather than only what the compound is claimed to do.
4 other glossary entries refer to this term in their own definition, which is usually the fastest way to see how it is used in practice.
A modified version of a naturally occurring peptide, engineered to improve stability, bioavailability, potency, or half-life. Semaglutide is an analogue of GLP-1.
Administration directly into a vein. Provides 100% bioavailability but requires medical supervision and sterile technique.
A non-invasive route of peptide administration via nasal spray. Allows some peptides to bypass the blood-brain barrier through the olfactory epithelium. Bioavailability varies widely (2-30%) depending on the peptide and formulation.
The time required for the concentration of a substance in the body to decrease by half. Determines dosing frequency and accumulation patterns.
Compounds where this applies: BPC-157, Semaglutide, Tirzepatide, PT-141, Tesamorelin, Epithalon, Selank, Liraglutide, 5-Amino-1MQ, NAD+ (Nicotinamide Adenine Dinucleotide), Exenatide, Dulaglutide, Lixisenatide, Albiglutide, Pramlintide, Calcitonin (Salmon), Setmelanotide, Oxytocin, Desmopressin, Nafarelin.
Terms that reference this one: Analogue, Intravenous (IV), Intranasal Delivery, First-Pass Metabolism.
More Pharmacology terms: Half-Life, Pharmacokinetics, Pharmacodynamics, First-Pass Metabolism, Receptor Agonist, Receptor Antagonist, Desensitization, Tachyphylaxis, Downregulation, GLP-1 (Glucagon-Like Peptide-1), GIP (Glucose-Dependent Insulinotropic Polypeptide), Glucagon, Amylin, Ghrelin, Growth Hormone Secretagogue (GHS), GHRP (Growth Hormone Releasing Peptide), GHRH (Growth Hormone Releasing Hormone), GHS-R1a (Growth Hormone Secretagogue Receptor), Secretagogue, Melanocortin Receptor.