Beyond Pesticides Rating: Least Toxic

Boric acid (borax and boron-containing salts)
is a low-toxicity mineral with insecticidal, fungicidal, and herbicidal properties.
It does not evaporate or volatilize into the air or pose the considerable
health concerns associated with synthetic pesticides;
however it can still pose health hazards and should be used with care.

As with any pesticide, keep boric acid pesticide products
out of reach of children and only use it in locations where it will not come
in contact with people or animals, such as in cracks and crevices,
behind counters, and in baseboards.

While boric acid is somewhat slower acting than the synthetic pesticides,
like chlorpyrifos, diazinon, or pyrethrins, it is highly effective
over a long period of time.