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It’s been only six years since Impossible Foods introduced a patty made with soy leghemoglobin to mimic beef blood.

Soy leghemoglobin, or heme for short, is what Impossible Foods describes as the "magic ingredient" in its plant-based burgers.

In 2019, the FDA said heme doesn’t require the same certification process as color additives in food, agreeing with Impossible Foods that "there is a reasonable certainty of no harm from this use of soy leghemoglobin as a color additive."

"FDA approved soy leghemoglobin even though it conducted none of the long-term animal studies that are needed to determine whether or not it harms human health," Freese said.

They say "blood is thicker than water," but what about soy leghemoglobin?