Receiving prenatal IV vitamins during pregnancy is more effective than oral supplements
B12 is generally considered safe in all life stages even at high doses and there are no known interactions with any medications, but some drugs can increase the risk of B12 deficiency, including acid-lowering drugs and metformin
The honest answer is that both very low and, in rare cases, very high B12 levels may be linked to shedding, but the strongest evidence points to deficiency as the real concern, not normal supplements
What is the difference between cyanocobalamin and hydroxocobalamin
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For example, cyanocobalamin can be risky for people with a condition called Leber's disease, as it might harm the optic nerve