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That is what most media reports missedeven though its the very first sentence of the paper

Or le glutathion en supplmentation orale naugmente pas ces niveaux (contrairement au spray intranasal), probablement parce quil ne passe pas la barrire hmato-encphalique

Adjunct N-acetylcysteine treatment in hospitalized patients with HIV-associated tuberculosis dampens the oxidative stress in peripheral blood: results from the RIPENACTB study trial

But there is very limited evidence that glutathione can change skin pigment
