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b12 injections versus oral supplements vs. Intramuscular Vitamin in Vitamin B12 Deficiency • The Blood Project Oral vitamin B12 versus intramuscular
Description
[Google Scholar] 66.Muller-Steffner HM, et al

Cellular uptake and energy support Once the B12 reaches your cells, it enters the mitochondriathe powerhouse of your cells

Dosing errors don't announce themselves

That said, B12 is not a shortcut for energy
