How are B Vitamins obtained?

How are obtained vitamins B1, B2, B3, B5, B6 and Choline / Inositol?.

R/ The vitamins, B1, B2, B3, B5, B6, choline and inositol are produced via fermentation of vegetable starch.  They are all made to either BP or USP (British or United States Pharmacopeia) standards so are of the highest quality