The<unk>  are eight water-soluble<unk>  that play important roles in cell metabolism.  Historically, the<unk>  were once thought to be a single<unk>  referred to as<unk> B (much like how people refer to<unk> C or<unk> D). Later research showed that they are chemically distinct<unk>  that often coexist in the same foods. Supplements containing all eight<unk>  are generally referred to as a<unk> B complex.  Individual<unk> supplements are referred to by the specific name of each<unk> (e.g. B1, B2, B3).
B vitamins
Vitamin A
Vitamin B6
Vitamin C
Thiamin
Folic acid 
Cholic acid
Vitamin D