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adults aged 19 and older have a vitamin B12 deficiency, defined as serum levels lower than 200 pg/mL
I have only been taking it for 3 weeks and it seems to help a little but time will tell
Cyanocobalamin is hygroscopic in the anhydrous form, and sparingly soluble in water (1:80)
For some people, they are debilitating enough to require dose reduction or discontinuation
However, the underlying mechanisms (DPC stimulation, cellular energy enhancement) are not sex-specific, so there is biological plausibility
It depends on your insurance and policy
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