A contract vitamin manufacturer is a company which produces products to a customer specifications. Companies and/or individuals contract with a vitamin manufacturer to have a product or products produced under their label. A full service vitamin manufacturer will assist in the formulation, development and ultimately the production of said formulation. There are a number of different kinds of vitamin manufacturers. It’s best to find one who specializes in the type of formulation you are looking for. There are a number of vitamin manufacturers who produce tablets and capsules. however, there are only a handful of contract liquid vitamin manufacturers.