Humco Boric Acid Powder is a chemical used in many pharmacies to compound special preparations (compounding prescriptions) according to a physician’s orders. As a chemical, it is not labeled with any use of directions for use. Boric acid is not only used pharmaceutically, but can also be used around the house. For example, placing boric acid on carpets can help rid them of fleas. Boric acid can also inhibit the growth of fungus, making it a great wood preservative and termite defender in household furniture. Adding boric acid to your laundry load can help to remove stains and odor from clothing. Boric acid is also effective as an insecticide and pesticide.