Keto burn xtreme carbohydrate metabolism and then those that increase energy expenditure so that you burn more calories but of course the real questions are are they effective and are they safe and when you consider safety it's important to consider both adverse effects interactions that can occur with the drugs or other dietary supplements and also the purity of the products whether or not there may be any contaminants and whether or not the product contains what is stated on a label and it's important to consider.