Aloe gel is able to scavenge the free radicals 2,2-diphenyl-1-
picrylhydrazyl (DPPH), 2,20-azinobis-(3-ethylbenzothiazoline-6-
sulfonic acid) (ABTS)þ, and nitric oxide in a concentrationdependent
manner, as seen in an in vitro study of the radioprotective
efficacy of A. vera gel