fda warning letter bpc-157 dietary supplement Enforcement Trends – What is looking for? Vitamins and Supplements | Clinical
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If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor

Most practitioners recommend starting at 250-300 mcg daily to assess tolerance, then potentially increasing to 400-500 mcg if initial response is suboptimal and no side effects occur
doi: 10.1016/j.clnu.2020.04.029

80% of patients have parietal cell antibodies