Tetrahydrocurcuminoids (THC)*, a colorless hydrogenated product derived from the yellow curcuminoids, (the biologically active principles from the rhizomes of Curcuma longa), function as efficient antioxidant compounds. The superior antioxidant property of THC, combined with the lack of yellow color, render this product useful in achromatic food and cosmetic applications that currently employ conventional synthetic antioxidants.