The Medicube AGE-R Glutathione Glow Toner 140ml is a double-layer milky brightening toner from South Korean brand Medicube. It holds 99.2% pure Glutathione as the main active, paired with six types of peptides and Alpha-Arbutin to reduce dark spots and improve skin tone. The formula sits in two layers, a glutathione essence and a peptide cream that you dispense together for one combined step. Medicube's clinical tests showed 16.7% skin radiance improvement after one use and a 5.493% decrease in melanin pigment after two weeks. It suits all skin types and carries a hypoallergenic certification, but it does contain fragrance and three labelled allergens, so very sensitive skin should patch test.