The FDA on July 23 gave approval as "generally recognized as safe" or GRAS to heme, a substance that is the key ingredient in Impossible Foods' vegetarian "Impossible Burger." Heme provides the product's convincing meat-like flavor, but last year the company hit a regulatory snag when the FDA found that its paperwork was insufficient to establish the substance's safety. This decision by the FDA reverses its previous stance. "Getting a no-questions letter goes above and beyond our strict compliance to all federal food-safety regulations," Impossible Foods CEO Patrick O. Brown said in a statement. "We have prioritized safety and transparency from day one, and they will always be core elements of our company culture."