The fact that high antioxidant levels could interrupt the ROS-p53 axis and prevent apoptosis (i.e. prevent cancer cells from dying) has been known for awhile.

The fact that high antioxidant levels could interrupt the ROS-p53 axis and prevent apoptosis (i.e. prevent cancer cells from dying) has been known for awhile. https://en.wikipedia.org/wiki/Acetylcysteine#Adverse_effects https://en.wikipedia.org/wiki/Acetylcysteine#Adverse_effects Edit: forgot to mention one of the relevant studies is from 2005.