Ive been using this combo to target dark spots and uneven skin tone., I start with the Abib Glutathiosome Dark Spot Serum, made with Glutathiosome (Glutathione + Exosome), to help brighten the skin Manyo Glutathione 7 Dark Spot Serum Ive been testing this brightening serum for dark spots and post acne marks. The texture is lightweight, absorbs quickly, and layers well in my routine. I like Glutathione Quantification in Live Cells with Real Time Imaging and Flow Cytometry ScienceDirect Order Glutathione Test Online TrueHealthLabs.com Sigma Aldrich Glutathione S Transferase (GST) Assay Kit, sufficient for 500 multiwell tests 1 kit Glutathione Even & Glow First Serum HEEDA