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vitamin B complex  a group that was originally called “vitamin B,” but was later found to contain numerous different vitamins. They are still referred to as a group because they are often found together in foods. Deficiency in only one of them is rare, so that a deficiency of one B vitamin usually is complicated by deficiencies of others. The group includes vitamin B1, vitamin B2, the vitamin B6 group, vitamin B12, niacin, folic acid, and biotin.




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