Collagen cannot be synthesized without adequate glycine availability
These reports cannot be verified as directly caused by BPC-157 versus contamination, incorrect dosing, or concurrent conditions, but they raise concerns that the peptide might paradoxically worsen mental health in some individuals

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11 However, some people may experience vitamin B12 side effects when taking high doses of supplements
The ancient roots of calcium signalling evolutionary tree
Vitamin B12 plays a vital role in red blood cell production, nerve function, and cellular energy