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Approximately 50% to 98% of the injected cyanocobalamin is in the urine
Precise measurement of ingredients is carried out by the help of analytical balance and it should be compliant to mandatory standards
This substance is dead, which is why it doesnt hurt when you get your hair cut
B12 supplements are generally recognized as safe AT ANY DOSE (SOURCE), but some supplements contain other nutrients like folic acid (which help B12 metabolize, but you dont want too much in synthetic form), so you should only take the recommended dose unless your doctor or pharmacist says otherwise
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