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Who should check with a provider first If you are pregnant, nursing, have kidney disease, or take medications that interact with B12 metabolism (such as metformin), discuss this with a provider before starting

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Vitamin B12 (1,000-5,000 mcg per mL): either cyanocobalamin (synthetic, stable form) or methylcobalamin (active form)

Injections bypass gut absorption problems and deliver a predictable dose into muscle or subcutaneous tissue

PubChem CID: 950107

This depends on their health, how well they absorb the vitamin, and their lifestyle