Most weight loss supplements are not tested in clinical trials or included in evaluation studies conducted under well-controlled conditions with average human volunteers. Weight loss pill manufacturers are not required to test new ingredients or even to list things like potential side effects on the product’s label. Therefore it can be hard to tell what type of ingredients you’re even ingesting when consuming weight loss supplements or how you’ll react to different dosages.
Adding a fat-burning supplement to your regimen to help burn belly fat won't necessarily be detrimental, but it's unlikely to do much good, either. You should always check with your doctor before you start taking a new supplement 1. According to personal trainer Christian Finn, the best ways for men to burn fat fast are to eat less than they burn, lift weights two to three times per week, eat a protein-rich diet and add in some cardiovascular work.