A Comprehensive Review of Bioavailability, Molecular Mechanisms, and Clinical EvidenceYoon Hang Kim, MDwww.yoonhangkim.com Abstract Oral peptide delivery represents one of the most significant pharmacological challenges in modern therapeutics. Despite the inherent instability of peptides in the gastrointestinal environment, several peptides have demonstrated remarkable oral bioavailability through various mechanisms including intrinsic stability, absorption enhancer co-formul