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When these symptoms show up, higher doses of vitamin B12 may be needed to help

Methylcobalamin Methylcobalamin is a naturally occurring, bioactive form of vitamin B12 that the body can use immediately

Available at: Last updated: 8/27/2014

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Previous research comparing intranasal cyanocobalamin to intramuscular hydroxocobalamin in cobalamin-deficient elderly individuals showed a swift increase in serum cobalamin levels following intranasal administration