But there is very limited evidence that glutathione can change skin pigment
Eating a diet rich in sulfur-containing foods (like garlic, onions, and cruciferous vegetables) provides the cysteine your body needs to produce its own "master antioxidant." What to Expect When You Start When you begin taking a high-quality glutathione supplement, the changes are often subtle at first
Test Code(s): 007700 Biomarkers Tested (1): Total Glutathione Specimen: Blood Preparation: No special preparation required
Figure 2: Effects of oral GSH supplementation on levels of GSH in plasma, lymphocytes, and buccal cells after 1 month, 3 months, 6 months, and 7 months of treatment
It can help other ingredients absorb into skin more effectively which can be a double-edged sword (great for actives, but can also make the active too strong if you have sensitive skin)