Boric acid has a low level of toxicity for humans. The chemical may irritate the eyes and skin. In rare cases, boric acid poisoning occurs when someone swallows boric acid or experiences repeated exposure to it.
Boric acid is made from the mineral boron. Manufacturers use boric acid in many products, including laundry additives, cosmetics and insecticides. Insecticides typically carry higher concentrations of boric acid because it acts as a stomach poison and nervous system toxin for many insects.
If a product contains boric acid, read and follow instructions carefully. If skin is exposed, wash the affected area thoroughly. If ingested, contact a health care provider as soon as possible.