Toxicity of boric acid
Boric acid, sodium borate, and sodium perborate are estimated to have a lethal dose (LD50) from 0.1 to 0.5 g/kg in humans[verification needed][5]. These substances are
toxic to all cells, and have a slow excretion rate through the kidneys. Kidney
toxicity is the greatest, with liver fatty degeneration, cerebral edema, and gastroenteritis. A reassessment of boric acid/borax by the United States Environmental Protection Agency Office of Pesticide Programs found potential developmental
toxicity (especially effects on the testes).[6] Boric acid solutions used as an eye wash or on abraded skin are known to be especially
toxic to infants, especially after repeated use because of its slow elimination rate.[7]