b12 injection make you tired Feeling worse after Injection: Answering concerns can vitamin b12 injections make
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PMID 20009308

The more meaningful risks are compounding quality, sterile technique, and the possibility of masking an undiagnosed condition behind a monthly energy boost

We will return to the town of Aguas Calientes

[Crossref] Isotalo PA, Wells GA, Donnelly JG (2000) Neonatal and fetal methylenetetrahydrofolate reductase genetic polymorphisms: an examination of C677T and A1298C mutations

when one is under strain, it can impact the other

I dont that it is "illegal as such"