How Do Fitspresso Supplement Work? The primary mechanism of Fitspresso Supplement Reviews revolves around the use of Beta-Hydroxybutyrate (BHB) salts. BHB is a type of ketone that the body can use for energy when carbohydrate intake is low. By increasing the levels of BHB in the blood, these capsules help the body enter and maintain ketosis more easily. 1.Enhanced Fat Burning: BHB ketones stimulate the body to break down stored fat, which the liver converts into energy. This process leads to faster weight loss while supporting muscle preservation.