- Raspberry Ketones Weight Loss Reviews, Results & Raspberry Ketone Testimonialsbr br Ketones are contained in a variety of berries on the market. It is a natural antioxidant and fat-loss enzyme that actually works directly with your body to encourage fat burning and energy production. Much like quite a few superfoods on the market, many of which that target anti aging, raspberry ketones are natural antioxidants that have a lot of additional benefits that cause weight reduction. Much like the chemical structure of capsaicin, which is found in a number of varieties of chili peppers, the substance actually helps influence fat metabolism, inhibits the absorption, and also aids in the oxidation of fat itself which can boost your overall energy levels.