side effects of b6 and b12 injections Do others experience from vitamin supplements? Too Much B12 Symptoms: Overdose
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10.1002/elps.200600022 52 Vilar NetoJ

Necessary for energy metabolism, fatty acid synthesis, and hormone production
Carmel R, Sinow RM, Karnaze DS

Before it is opened, a sealed vial stays good until the expiration date printed on the label, which is usually 2 to 3 years from the date it was made

Check for drug interactions - Some prescriptions, like proton pump inhibitors, can impact B12 absorption and may need to be changed