Ultra Thermo Keto UK supplement targets to do the same thing by supplying your body with certain chemicals that will trigger ketosis. Although it may work, Ultra Thermo Keto Reviews important to note that ketosis is a highly sensitive phase. Ketosis is a metabolic state in the body where the system is flooded with substances called ketones. It initiates the unlocking of fat cells to be burned as energy. Usually, ketosis happens when the body is deprived of carbohydrates or if a person has diabetes.