Beta-Sitosterol Plant SterolsCardioAid S Plant Sterol Esters is a combination of the ester forms of Beta Sitosterol, Campesterol and Stigmasterol. Plant Sterols are plant derived compounds that are structurally similar to cholesterol so that they help to limit the absorption of cholesterol from the digestive tract.* In this way, CardioAid S can help to maintain cholesterol levels already within the normal range.*Foods containing at least 0. 65 grams per serving of plant sterol