Peptides are often well tolerated, but they can still cause temporary reactions while the body adapts. Some commonly reported effects include: BPC 157 headaches, nausea, increased appetite TB 500 BPC 157, TB 500, KPV, GHK Cu 80mg (Klow Blend) Pharma Grade Peptides BPC 157 And TB 500: Background, Indications, Efficacy, And Safety GlobalRPH Simultaneous quantification of TB 500 and its metabolites in in vitro experiments and rats by UHPLC Q Exactive orbitrap MS MS and their screening by wound healing activities in vitro ScienceDirect