(MensHealth) - A compound in red wine could increase levels of testosterone circulating in your body by inhibiting the way you excrete the hormone, according to new research in Nutrition Journal. Normally, one of the ways testosterone is eliminated from your body is through urine. An enzyme called UGT2B17 attaches specific molecules to testosterone, enabling your body to get rid of it. But researchers at Kingston University in London found that quercetin—a compound in red wine—blocks UGT2B17 in lab studies. That means potentially elevated T levels in your bloodstream, and less in your urine.