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Although doctors may recommend B12 injection for this purpose when weakness is related to peripheral neuropathy, more research is needed on effectiveness, and Medicare doesnt consider this medically necessary

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Shan X, Zhang A, Rezzonico MG, Tsai M-C, Sanchez-Priego C, Zhang Y, Chen MB, Choi M et al (2024) Fully defined NGN2 neuron protocol reveals diverse signatures of neuronal maturation

BPC-157 shows the strongest evidence for improving sperm concentration, with studies documenting 25-40% increases in count after 12-16 weeks of treatment