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Vitamin B12 is not considered dangerous for most men, but excessive supplementation may mask underlying health issues, such as folate deficiency, if not managed with proper medical supervision
PMID: 16032049
These may include pain, redness or swelling at the injection site, mild diarrhea, nausea, or itching of the skin
Its required for proper absorption of B12
Their quality or safety may be compromised
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