Levodopa increases the level of homocysteine in the body and increases the risk of stroke and heart attack. So many treatments seem only to benefit recently-diagnosed patients. Everybody gets some benefit. Their degree of improvement will obviously be less than someone in an earlier stage of the disease. There are no significant side effects.
Family members can even perform the treatment once provided instruction.
I do caution other doctors not to mix glutathione with anything but normal saline. Other practitioners might want to mix it with vitamin C, but vitamin C renders glutathione useless by causing it to oxidize. Since glutahione increases the ability of the liver to process chemicals, there's a possibility that glutathione administration might render chemotherapy less effective. I lecture nationally probably ten to twelve times a year and I always ask how many doctors are using it. Probably at least ten to twenty percent of the audience raises their hand.