The most common causes include B12 supplementation (particularly injections), liver disease releasing stored B12, haematological disorders increasing B12-binding proteins, and chronic kidney disease reducing B12 excretion
[9] High-dose niacin (used to treat cholesterol) lacks human safety data in pregnancy and could theoretically affect the fetus (for example, by causing hypotension or altering lipid metabolism)
It is unique among vitamins in that it contains a metal ion, cobalt
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I have done lots of research re.other causes for high BP, and HR, and introduced and tested for many vits/ mins, or supplemented regardless ( eg thiamine ,Mg taurate)I do have lots of gut issues that probably effect absorption from food ( hypothyroidism, no gallbladder, and compromised pancreas thus the type 3c diabetes) and take drops/ sprays to be absorbed in the mouth where possible eg vit d with K2 drops, or gentle 3 Arrows Heme