Phyto means plant, and sterol is a type of steroid. Phytosterols can lower LDL levels. The FDA reports that 2 grams per day can reduce LDL. Sources include plants, unrefined plant-derived lecithin, nuts, seeds, legumes, wheat germ, whole grains, fruits, and vegetables. Note that too many phytosterols may cause bloating, diarrhea, and constipation.