glutathione is the master antioxidant in your body Antioxidant? Here’s What Science Says Glutathione: 7 Amazing Health Benefits

It identifies substances and methods that are prohibited in-competition , out-of-competition , and in some cases in particular sports

(5) D A Sibarov, A B Volnova, D S Frolov, and A D Nozdrachev (2007) Effects of intranasal administration of epitalon on neuron activity in the rat neocortex Neuroscience and Behavioral Physiology, 2007 Nov, Volume 37 (Issue 9), Pages 889-93

NAC, as a substrate precursor of the xc- system, normalises DLPFC neurotransmission and may enhance mGluR3 signalling, improving DLPFC network connectivity and neuronal firing [141, 197, 203, 219]

These are research-grade products, not pharmaceuticals

A: Research by Khavinson et al