Gallogen (the diethanolamine salt of the mono-(+)-camphoric acid ester of α,4-dimethylbenzyl alcohol) and soybean sterols have been tested for their effect, singly and in combination, on hypercholesterolemia and aortic cholesterol in cholesterol-fed cockerels. Gallogen alone was found to impede the rise of serum and aortic cholesterol, and also to potentiate these effects of soybean sterols.