<unk>  are a class of water-soluble<unk>  that play important roles in cell metabolism and synthesis of red<unk> lood cells. Though these<unk>  share similar names <unk> 1,<unk> 2,<unk> 3, etc.), they are chemically distinct compounds that often coexist in the same foods. In general, dietary supplements containing all eight are referred to as a<unk> unk>  complex. Individual<unk> supplements are referred to<unk> y the specific number or name of each<unk>  such as<unk> 1 for thiamine,<unk> 2 for riboflavin, and<unk> 3 for niacin. Some are more commonly recognized<unk> y name than<unk> y number: niacin, pantothenic acid,<unk> iotin and folate. Each<unk> is either a cofactor (generally a coenzyme) for key metabolic processes or is a precursor needed to make one and is thus an essential nutrient.
B vitamins
Folate
Cholic acid
Omega-3 fatty acid
Zinc
Vitamin
Vitamin C and the Common Cold 
Niacin