glutathione oral supplementation skin whitening clinical trials review for lightening: a regnant myth or evidence-based verity? PDF) Skin-whitening and skin-condition-improving effects

Since B12 and intrinsic factor HAVE to be absorbed together this can make for a difficult situation

You fall in the candidacy criteria: If you have concerns about skin discoloration or uneven skin tone Glutathione injections are usually thought to be safe for people with good overall health

7 However, the absorption of GSH in humans has not been adequately demonstrated, and may prove more challenging

Based on our structural analyses, we proposed that alternative loop and active site structures are the molecular basis for the lack of activities of the CGFS-type Grxs as oxidoreductases and the CxxC/S-type Grxs as FeS transferases