One study showed that older people living in a community setting (like nursing homes or assisted living) who had higher levels of glutathione were in better health, and that lower levels of glutathione was associated with energy depletion
Most patients receive injections weekly or bi-weekly, and side effects are mild and uncommon
Fatigue, weakness, especially lightning bolt sensations type of pain, joint pain, muscle pain, cognitive impairment, anxiety unrelated to stressors (eg a physical anxiety without a life trigger), depersonalization / derealization, depression, skin sensitivity, emotional lability, thermal lability, vertigo, dizziness, nausea, vomiting - and more
"Evidence that RNA viruses drove of adaptive introgression between Neanderthals and modern humans"