Boric acid is widely used as an antiseptic, insecticide, flame retardant, and neutron absorber. In medicine, it is applied as a mild antiseptic for minor cuts and burns, and in eye wash solutions to soothe irritation. It is also effective in treating fungal infections like athlete's foot.

In pest control, boric acid is a key ingredient in insecticides for killing cockroaches, ants, and termites. It works by disrupting their digestive systems when ingested.

In industrial applications, it serves as a flame retardant in textiles, wood, and cellulose insulation, reducing the flammability of materials. Additionally, boric acid is used in nuclear power plants as a neutron absorber to control the rate of fission in reactors.

In household products, it is found in laundry detergents and cleaning agents for its mild disinfecting properties. It is also used in the manufacture of glass, ceramics, and fiberglass to improve durability and thermal resistance. Furthermore, it acts as a preservative in cosmetics such as creams and lotions, and in agriculture as a boron source in fertilizers and pesticides to enhance crop yields and control pests.