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A systematic review and meta-analysis published in the Journal of Neurology, Neurosurgery, and Psychiatry in 2020 examined the effects of IV glutathione in Parkinson's disease

The most common side effects are mild injection site reactions (redness, tenderness), temporary fatigue, and occasional headaches

Treatment The Glutathione injection is administered directly into the bloodstream, typically through an intramuscular or intravenous injection

Nasal administration enables rapid absorption into the bloodstream, bypassing the digestive system and preventing degradation by stomach acids that may occur with oral capsules