bpc 157 for hypermobility BPC-157: What It Is, What We Know, and Why Its Use Arthritis Remains Unproven The Hidden Risks of BPC‑157:
Description
Going beyond 500mcg rarely provides additional benefit and may increase the likelihood of mild side effects like headaches or injection site reactions

B12 & Biotin Injections What are Vitamin B12 Injections

So injecting beyond a certain point may cause your cells to fight off the excess B12 so hard that it might reduce the amount of active cellular B12 - probably not to dangerous levels, but possibly sufficient to trigger some symptoms

Move the needle and retry
Food and Drug Administration (FDA)

It physically destroys fat tissue infrastructure