Gluta c lemon serum is a whitening serum that can be added to the lotion to boost its effects. Gluta-c lemon whitening serum is a light, water-based formulation that provides intense whitening action, with glutathione and vitamin c, two powerful antioxidants, and arbutin, which protects against photo-aging, reduces dark spots and prevents new ones from forming.this is a personal favorite of mine, also great for all promixing formula’s if you choose

INGREDIENT: Gluta-c, lemon Glutathione, Arbutin.