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There are actually 10 types of Vitamin-B present. They are Vitamin B1, B2,B3,B4,B5,B6,B7,B8,B9 and B12. Vitamin B is a water soluble vitamin and it plays a major role in the metabolism of humans. These type of vitamin-B can easily co-exist with one another, but they are completely different chemically. 
 Vitamin B1, B2,B3,B4,B5,B6,B7,B8,B9 and B12 are the vitamin-B present.