The SOME BY MI Yuja Niacin Blemish Care Serum is a highly-concentrated brightening serum that can help target dullness, blemishes and hyperpigmentation. Enriched with 82% yuja (citron) extract, which contains 3 times more Vitamin C than a lemon, to brighten and hydrate. Niacinamide, arbutin and glutathione helps even out your skin tone, while 12 types of vitamins revitalise and soothe your skin for a fresh and dewy complexion.