Before looking to supplements, I recommend 'checking all the boxes' in terms of your eating habits, exercise and sleep patterns. Nutrition isn't just about calories, it's also important to look at the types of calories you're consuming. Look to good protein sources (naturally raised meats, wild-caught fish, eggs), lots of vegetables and good fat sources (olive and coconut oils, avocados, fatty fish, nuts & seeds) as being the staples in your diet. Steer clear of processed and manufactured foods, and avoid those 'excess' carbohydrates. Grain-based foods such as breads, pasta and cereals can cause your insulin to spike, sending signals for your body to store fat. Also watch out for excess calories in beverages, even the natural sugars found in fruit juices. Check out The Paleo Solution by Robb Wolf for a more detailed guide to diet and weight management.
For exercise, you might need to shake things up a bit. If running has been your habit, try adding some weight training to your routine. Training with weights will keep you lean and strong!
In terms of supplements, a quality fish oil is my number one recommendation. Try the liquid from Ascenta Health (Nutra-Sea oil). CLA is another supplement that may be worth trying, and Quantum Nutrition has an excellent Fat Burner product based on a B complex formula with added chromium picolinate and natural thermogenic elements.
Finally, examine your lifestyle for signs of stress. Cortisol is a fat storage hormone that is directly related to belly fat, and cortisol is released whenever the body or mind undergoes stress. The solution? Make time to unwind and prioritize your sleep: 8 to 9 hours per night in a darkened room.
Response by Greg Carver