The natural substance Resveratrol (1,500 mg daily) significantly reduced androgen [testosterone] levels in women with PCOS. The beneficial effect may be due to reduced insulin levels.
Effects of Resveratrol on Polycystic Ovary Syndrome: A Double-blind, Randomized, Placebo-controlled Trial. J Clin Endocrinol Metab. 2016 Nov;101(11):4322-4328. Epub 2016 Oct 18. https://www.ncbi.nlm.nih.gov/pubmed/27754722