best bpc 157 source BPC-157 – Research Peptide Buy BPC-157 10mg - Research
Description
Each mL contains 0.9% benzyl alcohol added as a preservative

It would not

For example, if your Hb is low, and your MCV is raised, and then put on B12, and the Hb rises and MCV falls, there's the answer

[1] [2] Blood levels of B12 may rise quickly following injection, though elevated blood levels do not immediately translate to symptom resolution