Beta-sitosterol naturally occurs as part of a phytosterol complex and has indicated the potential to support 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 18-month follow-up trial, beta-sitosterol maintained healthy urinary function. These results have been supported in other clinical trials as well.