fda compounding restrictions bpc-157 Approval Status: Is It Approved for Human Use? FDA Staff: No Compounding for
Description
Thinking one could substitute for the other in a research context would be a catastrophic error in study design

B12 shots deliver a concentrated dose of cobalamin directly into muscle tissue, making them especially valuable for individuals with absorption disorders

The serum needs to make contact with your scalp, not coat every strand of hair

Lipidomics of human brain aging and Alzheimers disease pathology
Vitamin B12 I noticed this with one form of B12 that I tried but not with the other form