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 The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University Body Protecting Compound 157 (BPC 157 ): Overview, Potential Benefits, and Safety Dr.StemCellsThailand's Anti Aging and Regenerative Medicine Center of Thailand BPC 157: Experimental Peptide Creates Risk for Athletes