Replied by Mama To Many (Tennessee) on 07/03/2015
Dear April,
In general I would say that it is not harmful to human skin. I think it can be drying to the skin, though.
Diatomaceous Earth will not deter ants from the sugar scrub. Its mechanism is to kill insects after they contact the DE. If you could add Peppermint Essential Oil to your sugar scrub, that would be more likely to deter them. Cinnamon or Clove Essential Oils would be other scent options that may deter the ants. You would not need to add much to your sugar scrubs as the oils are quite strong.
~Mama to Many~