While consuming a diet rich in Glutathione or taking supplements can increase the levels of Glutathione in the body, the efficacy of this antioxidant diminishes as it passes through the digestive system
For a broader overview, see the AJMC article on oral peptides
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Glutathione is generally well-tolerated but can cause mild gastrointestinal side effects and, possibly, skin flushing
Other reported mechanisms include activation of FAK-paxillin complexes (which help cells migrate and attach to surfaces during wound healing), JAK-2 signaling, and ERK1/2 pathway activity (Sikiric et al., Current Neuropharmacology, 2016
Wellbeing Glow Collagen combines hydrolyzed marine collagen + L-glutathione + SkinAx + vitamin C + biotin + hyaluronic acid, creating a 360 glow formula