Robust Extreme is made up of Spiral Algae, Corn Extract, Medlar Extract, Ginseng Extract, Epimedium Extract, Cistanche Salsa Extract and Hawthorne Berry Extract. Robust is made up of all-natural herbs and nutrients that are widely studied abroad for their health benefits. Robust is a supplement approved by FDA for men. To date, we haven’t received any unusual effect of the product from our loyal and satisfied customers. (F.D.A FR. No. 108330)