The following points highlight the top two vitamins produced by microbial fermentation. The vitamins are: 1. Vitamin B12 2. Vitamin B2. 1. Vitamin B12 (Cyanocobalamine; Cobalbumin): This vitamin is recovered as a by-product of streptomycin and aureomycin antibiotic fermentations. A soluble cobalt salt is added to the fermentation reaction as a precursor to vitamin B12. […]