The main ingredient of this product is a natural herbal supplement that appears to have a long history, at least with men in Malaysia, and a decent reputation in the male enhancement industry. The MIT connection does lend the product some credibility, but there are certainly other products that contain the same ingredients. You may also find better information elsewhere about the ratio of ingredients for other products than you’ll find from Biotropics. At nearly $30.00 a bottle, you might also do well to shop around a bit before settling on one of many products with similar ingredients providing better results. There are many more ingredients that can help men obtain long-lasting erections and improve size and girth, Tenaga XX has one powerful ingredient. Look for a natural testosterone supplement that contains several heavy-hitter ingredients, I know you’ll be happy… Can’t wait to see that smile on your face!