"Dietary supplement" could mean multivitamins, vitamin C, etc. It's unlikely that your doctor meant weight loss pills, though. Products such as Leptropril contain stimulants and can cause a wide variety of side effects, especially considering the amount of meds you are taking. Some of the ingredients in many diet pills will interfere with your meds. I agree with MrsJim, definitely take the list of ingredients to your doctor for approval if you decide to take this product. We don't recommend it, though.
I remember when Jennifer was dealing with PCOS, she took the supplement alpha lipoic acid, as recommended by her doctor, and said it was suggested for most people with PCOS. You might look into that.
It's more about the overall picture of improving your health through a better diet and exercise program so that you lose weight. A recent study showed that both low carb and low fat (low calorie) diets improved PCOS symptoms, and that it was the act of losing weight, more than the diet followed, that "cured" it. If I remember correctly, exercise was determined to be more important than diet in this process. Do both, and you are well on your way to better health