So long as you exercise off more calories than you're putting in, the weight'll slowly drop off anyway, unless there's an undiagnosed medical problem. Some herbal preparations act as mild diuretics or cause a faster excretion of waste products, so in this way, they could be said to help with weight loss, but overall, tablets which proimise this have a short-lived action. Once you stop taking htem, the weight'll pile on again unless you educate your body into accepting the right foods, and less of it.