Glutathione is the master antioxidant produced by cells. It is made by the body and can become depleted in disease states such as Covid, autism, dementia, etc.
N-acetylcysteine is a great precursor for glutathione and raises levels quite well. One other supplement which also works well to boost glutathione is whey protein isolate which you can buy at the Vitaminshoppe or Kroger.
Because of this COVID business, people are researching and learning a lot about supplements. I’ve got a relative who researches it about six plus hrs per day. She calls it biology chemistry - or biochemistry or something like that.