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To understand why vitamin B12 is important for hair health, lets look at how it works in the body and how it impacts hair [2]: Red blood cell creation First, vitamin B12 helps the body produce the red blood cells it needs

PMID 29887343

It also does not mean FDA staff were wrong

Cyanocobalamin, Cyanide, and Kidney Disease There are four forms of vitamin B12, differentiated by the side group attached to the cobalamin molecule: adenosylcobalamin, cyanocobalamin, hydroxocobalamin, and methylcobalamin

Established medical use: Corrects deficiency in adults and children with diagnosed GH deficiency (an FDA-approved indication)