using glutathione to whiten skin Brightening vs. Whitening: What's Safe & What's Toxic? Glutathione for skin lightening -

In addition to these, glutathione is also responsible for modulating the ability of depigmentation of cytotoxic agents that target melanocytes, thereby potentiating their effect and further aiding the process of skin lightening

Immune Function Foundational antioxidant support for healthy immune response.*

The researchers notably found that epithalamin not only produces direct antioxidant effects, but also stimulates the expression of antioxidant enzymes like superoxide dismutase and ceruloplasmin [10]

Its not an approved drug either but it sure looks like one

This gives a concentration of 20 mg per ml , which works out to 0.2 mg per unit on a 1 ml insulin syringe