Can you provide a source or explain how you came to the conclusion that it is one of the most studied substances on the planet?

Personally I'm not worried about aspartame. I consume it in small amounts and am not overly concerned, but this statement goes beyond the facts I'm aware of.

Update: I found a source, the FDA says that: https://www.fda.gov/food/food-additives-petitions/additional...

I had heard that about. Msg, but not aspartame. Til!