is bpc 157 dangerous Multifunctionality and Possible Medical Application of the Peptide—Literature and Patent Review What to Know About Peptides

Vitamin B12 has a very low risk of toxicity, so there's really no upper limit to how much you can take without harm

Perhaps indirectly if you take excessive amounts

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Cobalamin deficiency: clinical picture and radiological findings. Nutrients 5.11 (2013): 4521-4539