I used to consume Yeast for folic acid. Lewis Labs was the best till few years ago Russian chose to play with it since it became so valuable for the production of their alcoholic beverages. After the fermentation process is completed the yeast is harvested, thoroughly washed, pasteurized, and dried on roller drum dryers. The B vitamins are both naturally produced during fermentation, and added to the cream prior to the drying process. Riboflavin (B2) and Cyanocobalamin (B12) are created during fermentation. Additional Riboflavin (B2) and Cyanocobalamin (B12) are added after fermentation along with Thiamine (B1), Pyridoxine HCL (B6), Niacin and Folic Acid. Infact what this bag contains yeast and supplements, where I could care less for unregulated business for supplements.