acetaminophen glutathione depletion studies The Metabolism of and the Synthesis of Acetaminophen Pathway (toxic doses), Pharmacokinetics

At these therapeutic concentrations, glutathione actively inhibits tyrosinase the enzyme responsible for melanin production resulting in progressive skin brightening, tone unification, and a visible reduction in pigmentation

(2023) The kinetics of glutathione in the gastrointestinal tract of weaned piglets supplemented with different doses of dietary reduced glutathione

Ketoconazole shampoo is approved for dandruff and seborrheic dermatitis, not hair loss

Older adults: Potentially up to 43% of older adults may be deficient in B12, depending on the definition used - that's due to not having enough IF to aid absorption