A 16-week parallel-group trial in 130 hypercholesterolemic men and women comparing two doses of isolated soy protein with casein for effects on lipids, lipoproteins and homocysteine.
Citation: Tonstad S, Smerud K, Høie L. A comparison of the effects of 2 doses of soy protein or casein on serum lipids, serum lipoproteins, and plasma total homocysteine in hypercholesterolemic subjects. American Journal of Clinical Nutrition 2002;76:78–84.

