NOW Foods Saw Palmetto Extract 160 mg delivers standardized Serenoa repens berry extract at 45% fatty acids — the potency level used in the European clinical trials that established saw palmetto as an evidence-based botanical for benign prostatic hyperplasia (BPH) symptoms. Saw palmetto works primarily by inhibiting 5-alpha reductase (the enzyme that converts testosterone to DHT in prostate tissue) and by blocking DHT from binding to androgen receptors in the prostate gland — reducing prostate cell proliferation and improving urinary flow. Multiple clinical studies and meta-analyses support its effectiveness for reducing nighttime urination frequency, improving urine flow rate, and reducing incomplete bladder emptying. NOW Foods uses a liposterolic extract standardized to 45% fatty acids in softgels for optimal fat-soluble absorption, manufactured in their GMP-certified facility.