Boric acid is the main form of boron in blood, urine, and other body fluids [2,4,7]. the lack of substantial changes in blood boron levels in response to large increases in dietary intakes suggests that the body maintains boron homeostasis, likely by increasing urinary excretion, but the regulatory mechanisms for boron homeostasis have not been identified [ 6 ]. Boric acid can be used as a source of boron in nutrient solutions. product number: 10301 size: 25 kg (55 lb) Boron is used for boron deficiency and pain related to menstruation. women sometimes use capsules containing boric acid, the most common form of boron, inside the vagina to treat yeast infections. people also apply boric acid to the skin as an See prices and buy boric acid, cas no. 10043-35-3. request custom packages or custom synthesis to facilitate your lab research.