Many sweeteners, and products like candy and chocolate that contain them, can come from GMO sources. Look for organic and non-GMO sweeteners, candy and chocolate products made with 100% cane sugar (to avoid the GM beet sugar), evaporated cane juice or organic sugar. And watch out for soy lecithin in chocolates and corn syrup in candies.
The sweetener aspartame is derived from GM microorganisms. It is also referred to as NutraSweet or Equal and is found in over 6,000 products, including soft drinks, gum, candy, desserts, yogurt, tabletop sweeteners, and some pharmaceuticals such as vitamins and sugar-free cough drops.