Monsanto will pay a $39.5 million class action settlement for falsely claiming that Roundup weed-killer targets an enzyme that is only found in plants.

The issue was that Monsanto promoted Roundup’s safety for people and pets by claiming that glyphosate, the active weed-killing chemical, targets an enzyme that is only found in plants.

The lawsuit claimed that the enzyme is actually found in people and pets, where it is essential for maintaining the immune system, digestion, and brain function.