glutathione skin tone works for by reducing melanin production, which helps lighten the skin and reduce pigmentation. It acts as an antioxidant, protecting the skin from oxidative damage, which can cause aging and Glutathione Injections for Skin Whitening:

Similar to the circulating memory T cells described earlier, noncirculating tissue-resident memory T cells also rely on fatty acid metabolism for long-term maintenance

Useful polymers include water-soluble polymers such as cellulosic polymers, e.g., hydroxypropyl methylcellulose, and water-insoluble polymers such as cross-linked carboxyl-containing polymers

doi: 10.1378/chest.07-2134

Single injection provides minimal benefit while weeks of daily dosing produce measurable improvements

However, a plastid localized MS has been described leading to the conclusion that plastids are autonomous for Met synthesis and that cytosolic MS is involved predominantly in regeneration of Met for SAM synthesis in the SAM cycle (Ravanel et al., 2004