vitamin33Is Vitamin D 33 low , hh , normal or dangerous & what it means? It's common in Jaisinghnagar, Gaya, India, L'Honor-de-Cos, Le Diamant, Gaotuan, Hulayqat,This is a fact sheet intended for health professionals. For a general overview, see our consumer fact sheet.. Introduction. Vitamin B12 is a water-soluble vitamin that is naturally present in