bpc-157 safety toxicity Multifunctionality and Possible Medical Application of the BPC 157 Peptide—Literature and Patent Review BPC-157: What It Is, What
Description
It may however take a few days or weeks (especially if addressing a B12 deficiency)

For those diagnosed with a true deficiency , injections might be needed weekly or monthly until levels are normalised, GP surgeries would typically schedule B12 injectsions every 12 weeks thereafter

PMID: 165 BoodaghidizajiMJunglesTChenTZhangBYaoTLandayAet al

therapy with peptide BPC-157
