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an unusual or allergic reaction to cyanocobalamin, cobalt, other medicines, foods, dyes, or preservatives
Best For: Healing and recovery, especially for active individuals or those with chronic injuries
This is much easier to measure than a solution with a strange concentration
It hasnt happened since
age-related plasma decline (roughly 200 ng/mL at age 20 to about 80 ng/mL by 60): Pickart L, Margolina A
A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
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