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The concern isn't usually the collagen itself, but the biotin (Vitamin B7) that is often added to collagen supplements
(1996) Effects of vitamin B12 on performance and circadian rhythm in normal subjects
The practical effect is that a 503A pharmacy using AOD-9604 as a bulk substance operates in a regulatory gray area
Also, the cyanocobalamin medication is approved for use in humans as well and has some slight differences in ingredients compared to the 100mL bottle of injectable B-12, which could affect cost
They tend to resolve by themselves once your body gets used to the supplement
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