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ghk cu im or subq ghk-cu injection site recommendations subcutaneous Marla BSN, RN GHK-Cu Peptide: What It Does
Description
According to StatPearls (NCBI Bookshelf), the most common adverse effect of intramuscular vitamin B12 injections is significant pain at the injection site, which is particularly noted in thinner individuals

Amino Acids , including L-Carnitine, transport fatty acids into cells mitochondria where fat is burned for energy, enhancing fat loss and exercise performance
E., Zeskind J

This does not invalidate the findings, but it means the evidence base is not yet at the level of FDA-approved pharmaceuticals

In contrast, methylcobalamin is the naturally occurring, bioactive form of Vitamin B12
