Beta-Sitosterol 270's by Pure EncapsulationsWhat Is It? Beta sitosterol is a naturally occurring plant sterol. Plant sterols are a family of compounds similar in structure to cholesterol that have positive effects on prostate health.* Uses For Beta Sitosterol Supports Prostate Health: In a 6 month randomized, double blind, placebo controlled, multicenter study with 200 male subjects, it was proposed that a mixed phytosterol complex providing beta sitosterol supported healthy urinary flow. In an