Bluebonnet Nutrition - Plant Sterols 500 mg. - 60 Vegetable Capsule(s) Bluebonnet Nutrition Plant Sterols 500 mg. provides non-GMO plant sterols from soy. Plant sterols are plant compounds which are chemically similar to cholesterol. Products containing at least 500 mg per serving of plant sterols eaten twice a day with meals for a daily intake of 1000 mg as part of a diet low in saturated fat and cholesterol helps support cardiovascular health. Plant Sterols 500 mg.