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It has been confirmed that GSH increases the proliferation of T cells, secretion of IL-2, synthesis and turnover of IL-2 receptors [86,87,88], and the replenishment of intracellular GSH with NAC, which restores IL-2 production through T cells [89]

Sultana P, Kim YK, Cho SJ, Asadujjaman M, Jee JP (2025) Advances in cell membrane-coated nanoparticles: multifunctional platforms for targeted drug delivery, precision phototherapy, and enhanced immunotherapy

This includes the ability to produce Glutathione, which starts as a gradual decline and compounds over time

Foods naturally rich in glutathione Some foods contain high levels of glutathione and can provide it directly, but the compound is not absorbed well through the gastrointestinal tract, because digestive enzymes break it down into amino acids