1. Caffeine:
Caffeine is a natural stimulant found in coffee, tea, energy drinks, and some supplements. It boosts metabolism by stimulating the central nervous system, leading to increased calorie burning and energy expenditure.

2. Green Tea Extract:
Green tea contains catechins, which are powerful antioxidants that may enhance fat burning. One of the main catechins, EGCG (epigallocatechin gallate), has been shown to promote fat oxidation, especially when combined with exercise.

3. Capsaicin:
Capsaicin, the compound responsible for the heat in chili peppers, may increase metabolism by enhancing thermogenesis and promoting the burning of fat. It can increase calorie burning by increasing body temperature and stimulating the nervous system.

4. Protein-Rich Foods:
Protein has a higher thermic effect compared to fats and carbohydrates, meaning it takes more energy to digest and metabolize. Eating a protein-rich diet can boost your metabolism by increasing your energy expenditure after meals.

5. Apple Cider Vinegar:
Apple cider vinegar can promote fat loss and improve metabolism by lowering blood sugar and improving insulin sensitivity. It can also help control appetite, leading to fewer calories consumed.

6. L-Carnitine:
L-carnitine is an amino acid-like compound that helps transport fatty acids into cells for energy production. It’s often marketed as a fat-burning supplement.

7. Citrus Bergamot:
Citrus bergamot is an extract from the bergamot orange and is often used in supplements aimed at improving metabolism and reducing body fat. It can help by improving fat metabolism and reducing cholesterol levels.

8. Fiber-Rich Foods:
Foods rich in soluble fiber, such as oats, beans, lentils, and fruits, can help regulate digestion and improve blood sugar control. These foods can also increase thermogenesis because they take more energy to digest.