Boric Acid products kill ants.

Victor® Boric Acid

This natural product kills roaches, ants, earwigs, silverfish, palmetto bugs and water bugs. M198 Contains 40% Boric Acid, German Cockroach Pheromone and food bait. M199 contains 100% Boric Acid.

Instructions
Apply powders directly into cracks and crevices, wall voids and attics using a duster or flexible bottle with small, narrow nozzle