What is Bioavailability? Bioavailability refers to the proportion of a substance (such as a drug, nutrient, or supplement) that enters the bloodstream and is available for use or storage in the body Huberman's Sleep Peptide: How Pinealon Doubled His REM Sleep Bioavailability and bioequivalence EUPATI Toolbox Frontiers Pharmacokinetic Profile and Oral Bioavailability of Diosgenin, Charantin, and Hydroxychalcone From a Polyherbal Formulation Did Epithalon for the last month. No noticeable effects