Wound healing applications, supporting recovery from procedures or injuries, may use higher concentrations under professional guidance
10.1371/journal.pone.0039835 PLoS One 177 SchwarzK.FoltzC
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Differing compartments of intracellular glutathione have differing levels of [PMID: 17097824] Laboratory literature summary: Differing compartments of intracellular glutathione have differing levels of glutathione in cystic fibrosis
Both are unapproved research chemicals the 2026 compounding landscape remains in flux but that is not the same as FDA approval
doi: 10.1007/s004210050044 Takagi Y, Kurihara S, Higashi N, Morikawa S, Kase T, Maeda A, Arisaka H, Shibahara S, Akiyama Y: Combined administration of (L)-cystine and (L)-theanine enhances immune functions and protects against influenza virus infection in aged mice