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 Brain gut Axis and Pentadecapeptide BPC 157: Theoretical and Practical Implications Bentham Science Modulatory effects of BPC 157 on vasomotor tone and the activation of Src Caveolin 1 endothelial nitric oxide synthase pathway Scientific Reports Biotech TB500 & BPC 157 blend 5 5mg