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Some contain impurities or unexpected substances

Why Vitamin B12 Matters for Nerve Health Vitamin B12 (cobalamin) is an essential water-soluble vitamin required for: Myelin repair (protective coating around nerves) Neurotransmitter function DNA synthesis & cellular repair Red blood cell formation & oxygen delivery The body cannot manufacture B12 , and deficiency is common especially among older adults, vegans/vegetarians, people with absorption disorders, and those taking drugs like metformin

This is not because BPC-157 is banned per se, but because it has never undergone the rigorous clinical trials and regulatory review required for pharmaceutical approval

That synaptogenesis framing is where the popular "builds new connections fast" timeline narrative originates