The STEM™ Fruit Fly Trap is made with botanical extracts to fight nature. It's safe to use indoors around people and pets (when used as directed, of course), wherever fruit flies are buzzing around. In this Fruit Fly Trap, there's a potent combination of ingredients designed to attract and drown fruit flies. In case you’re curious, sodium lauryl sulfate is found in soap, ethyl lactate is a solvent found in wine, malic acid is the sour flavor in apples, and the syrup ingredient provides a sugar source to attract the fruit flies to the liquid inside the jar.