Nature 508 , 258262 (2014)
Estudio MESO_2408 de evaluacin de seguridad, eficacia y tolerancia del producto cosmtico aox ferulic y del producto nutracutico aox glutathione
They also had a 46.2% lower glutathione level than the controls
Framed for research, not as a safety guarantee
Final thoughts L-cysteine is valued for its ability to increase glutathione levels in the body, the mother of antioxidants. It works as an antioxidant, and it helps boost lung and brain function
Denis, Effects of N-acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study., Redox Biology, Volume 6, 2015, Pages 198-205, ISSN 2213-2317