My suggestion is to eat healthy, natural food and exercise regularly (preferably in the nature, not in the gym). You might do this already, but if you really have some spare fat, you should look into if you eat too much carbohydrates. Sugar (a carbohydrate) is added to nearly everything now adays, and it has alot more responsibility for overweight than fat itself does. Fructose (the sugar from fruits) is better than the table-sugar Glucose, both in effect on blood-sugar and on weight.

When it comes to supplements, I don't have a big belief in them. If you are unhealthy fat, there is most likely a good reason for it, and you should attack the reason behind instead of attacking the symptoms.