Formic acid is a naturally occurring organic compound found in the bodies of ants and other insects. It is also found in some plants and is used as a defensive agent against predators. The source of formic acid is ants, which produce it as a byproduct of their metabolism. Ants are the primary source of formic acid, but it can also be synthesized in a laboratory. Formic acid has many uses, including as a preservative, disinfectant, and pesticide.