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Test vitamin D (25-hydroxyvitamin D), zinc, magnesium, B12, and folate levels every 6 months initially

The estimation of total cellular GSH and GSSG levels was performed through GSH/GSSG-Glo Assay Kit (Promega) as per manufacturers instructions

Skin penetration factors include: Molecular size of glutathione Formulation technology Skin barrier condition Use of penetration enhancers These factors allow the topical products to penetrate into the skin and deliver the best results in the form of skin brightness

Depending on the treatment, you'll want to prep the area beforehand by removing any makeup, lotion, sunscreen, deodorant, or product