You may understand herbal diet pills as dietary supplements that can aid in weight loss. The highlight about herbal diet pills is that they are manufactured using natural ingredients such as plants and herbs. Often, herbal diet pills contain a combination of herbs, each of them bestowing the product its own unique benefits. Some popular herbs you may come across in the popular herbal diet pills include green tea extract, garcinia cambogia, glucomannan, yacon syrup, and ginseng.