Diuretics help rid your body of excess water in order to look as cut as possible. In theory, they help reduce water retention by making the user urinate more. Diuretics are typically used by bodybuilders who want to be in the right weight class before competition, but they can also be used to flush the urinary tract to treat infections. In fact, these supplements are sold for their ability to prevent bloating, kidney stones and mild hypertension. The products in this section include any number of different nutrients. However, common diuretic ingredients include horsetail, parsley, hibiscus, dandelion extract, hawthorn, ginger, juniper, green tea, black tea and more.