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Another important type is methylcobalamin , which is an active form of the vitamin

Pernicious anaemia , the autoimmune condition causing B12 malabsorption, may coexist with other autoimmune disorders, including autoimmune thyroid disease and, less commonly, rheumatoid arthritis

AHK-Cu is synthetic and was designed specifically for hair and scalp applications

Metabolism 47 : 14811489 Morrow LA et al

They are typically used to treat vitamin B12 deficiency