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Common side effects reported by the Mayo Clinic include: Diarrhea Headache Nausea If these side effects become severe or troublesome, let your healthcare provider know immediately
While B12 is usually safe, too much can be harmful
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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
Slowly inject bacteriostatic water along the inside wall of the vial never directly onto the powder
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