A 2025 Phase IIb trial found that intranasal glutathione improved symptoms in Parkinsons patients, with a 4-point reduction in disease severity scores
Besouw MT, Bowker R, Dutertre JP, Emma F, Gahl WA, Greco M, Lilien MR, McKiernan J, Nobili F, Schneider JA, Skovby F, van den Heuvel LP, Vant Hoff WG, Levtchenko EN (2011) Cysteamine toxicity in patients with cystinosis
doi: 10.1007/s12035-014-8705-x
This is not necessarily a problem, but it does mean that the first injection after an extended gap may feel like a step backward more nausea, more appetite suppression, more side effects even if you've been on the same dose for months
Antioxidant actions of selenium in orbital fibroblasts: A basis for the effects of selenium in graves orbitopathy