The powder, also called sodium tetraborate decahydrate, is a boric mineral with preservative and cleaning properties.
While it’s considered a non-toxic ingredient, there is conflicting information about how safe it is to use. That because borax is closely related to boric acid, a poisonous substance that is most often used in pesticides.
However, the general consensus is that Borax is safe to use as long as it doesn’t come into contact with the eyes and it’s not ingested or inhaled. Borax can also be dangerous for pets and young children, so it should be stored in a safe place at all times.