chemistry and pharmacokinetics

a deliberately stabilized fragment

Semax's structure is deceptively simple: seven amino acids (Met-Glu-His-Phe-Pro-Gly-Pro) where the first four come from ACTH and the last three are the stabilizing PGP extension. community modifications like N-Acetyl Semax Amidate (NASA) add further chemical groups but lack clinical data. the intranasal PK profile explains both onset and duration.