Proponents also suggest that beta-sitosterol can help stimulate the immune system, relieve pain, reduce inflammation, and enhance sexual function. Benefits. Here's a look at the science behind the potential health benefits of beta-sitosterol: 1) Benign Prostatic Hyperplasia There's some evidence that beta-sitosterol may help treat benign prostatic hyperplasia (or BPH, a condition commonly referred to as enlarged prostate).