Please take a moment to take up cause on restrictions of Aspartame here,
Aspartame in Milk
This is the FDA public comment period for allowing Aspartame into cow's milk as s sweetener.
My personal experience with Aspartame, in a nutshell,
If I eat something with aspartame in it, say diet Snapple, yogurt, gum, I get diarrhea. Plain and simple. If I eat, regular Snapple, yogurt w/out Aspartame (currently there are several, and it's clearly stated as an ingredient), or another sugar free gum-- my stomach is fine. This is one of the few foods/food additives that upsets my stomach. People, I write a food blog, where my GI tract is the laboratory. It's pretty resilient.
Take a look at the Aspartame issue and decide for yourself. Here are a few other sources reporting on the FDA/Aspartame response.Thank you.