No, heme is naturally found in all plants but in tiny quantities, they put the gene for heme into yeast to mass produce it. Read more here: https://impossiblefoods.com/heme/
(Of course, pretty much everything in the US without an organic label is an unholy mishmash of gmos, pesticides approved by captive regulators, and untold gallons of antibiotics. So probably doesn't make much of a difference anyways...)
