The yeast is not meant to be ingested, only harvested to refine the opiates. Jay Keasling, a Synthetic Biology Professor at Cal [https://en.wikipedia.org/wiki/

The yeast is not meant to be ingested, only harvested to refine the opiates. Jay Keasling, a Synthetic Biology Professor at Cal [https://en.wikipedia.org/wiki/Jay_Keasling https://en.wikipedia.org/wiki/Jay_Keasling] uses E. Coli & Yeast to produce a precursor to a Malaria drug (artemisinic acid), as well as for environmental cleanup. They too convert glucose to a complicated chemical structure of artemisin, which is purified through biological pathways further reducing cost.