bpc-157 dosing studies for bpc 157 peptide BPC-157: What Research Shows (and What It Doesn't) Frontiers | Pharmacokinetics, distribution, metabolism,
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O.BagriantsevS

In contrast, supplements that contain multiple B-complex vitamins provide 50 to 500 mcg of vitamin B12

Without going into details he finally texted, I see nothing to prevent your taking the vaccine
There has not been a UL (upper intake level) established for B12 because it is not stored in your body and therefore, can not build up enough to cause serious adverse side effects for most people
