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B12 Observational Studies Table 1 below summarizes the observational studies most relevant to supplement B12 safety in healthy adults

Because it remains active for so long, research protocols typically involve much less frequent administrationoften just once or twice per week

Consult a qualified healthcare provider before beginning any peptide protocol

The reports theyve received havent raised concerns about the adequacy of the B12 amount in their supplement (private correspondence with Stephen Walsh in August 2021)

Whether they reflect dose-related issues, sourcing variability, or true pharmacological effects is unknown, precisely because the human data does not exist to answer that question