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Castilla-Cortzar I, Pascual M, Urdaneta E et al (2004) Jejunal microvilli atrophy and reduced nutrient transport in rats with advanced liver cirrhosis: improvement by insulin-like growth factor I

The vitamin is also known as cobalamin, which reflects its cobalt content

repletion reverses hematologic symptoms within days and neurologic sequelae over weeks, reflecting differential tissue turnover

Which makes it surprising when you hear that B12 deficiency is relatively common

Synthetic Cyanocobalamin for Reliable Supplementation The active ingredient, cyanocobalamin, is a laboratory-produced form of vitamin B12 that works in the body the same way as naturally occurring vitamin B12 found in fish, seafood, dairy products, and egg yolk

This usually applies if you have vitamin B12 deficiency or conditions that can cause it