it's due to rapid weight loss. This means that the people taking this shit are taking too much and too fast. In other words, they're FAFOing you shouldn't take shortcuts to get to where you are. Give yourself a year or two if you're gonna lose weight. Any large amount of weight loss in a very short period of time is BAD for your body. If you're gonna take this thing, take the lowest and least amount of it and avoid going overboard. Also stop smuggling this shit from India.