Replacement of Contentious Inputs in Organic Farming Systems (RELACS)

• Many of the vitamins available on the market, such as vitamin B2 (riboflavin), are produced using genetically modified organisms (GMOs) and therefore cannot be added to feed on organic farms. • A screening of non-GMO wild-type microorganisms that overproduce riboflavin was conducted. The wild-type yeast Meyerozyma guilliermondii produced the highest riboflavin concentration in the screening procedure. • Using an adapted fermentation strategy, 30 mg riboflavin per g dry cell weight was achieved on a laboratory scale with a GMO-free yeast strain.