US$ 23.23
vitamin b12 intravenous injection Compounded Cyanocobalamin (Vitamin B12) B12 Booster Injections | Energy
Description
If no problems occur, gradually increase to your target dose

The Journal of clinical endocrinology and metabolism , 82 (5), 14721479

PMID 16015269

We get it from our diet, primarily from animal products
