Size: 5 sample vials approx 20ml Discoloration Defense is a layerable daily-use dark spot corrector clinically proven to reduce the appearance of key types of skin discoloration including hard-to-treat forms such as stubborn brown patches and post-acne marks. Formulated with 3% tranexamic acid 1% kojic acid 5% niacinamide and 5% HEPES this latest-generation formula improves the appearance of skin discoloration brightens skin and evens skin tone in as early as 2 weeks. Discoloration Defense 30ml is available here.