Yeast Extract is a concentrate of the water-soluble portion of Saccharomyces cerevisiae cells that have been autolyzed. It is rich in vitamins (especially B-complexes) amino acids and other growth factors. It is used in many microbiological culture media formulations as an excellent growth source. Yeast extract is considered a non-animal product and is used extensively for many non-animal
formulations of bacterial, fungal, mammalian and insect cell culture.