Powered with a whopping 10% of niacinamide (vitamin B3) and 2% of arbutin, the TIA'M Vita B3 Source is your new holy grail against dark spots and discoloration. The two star ingredients work together to inhibit the production and activation of melanin, preventing all kinds of unwanted pigmentation. Watch as your complexion transforms to healthy and glowing skin. The good news doesn't stop there! Because niacinamide is a multi-tasking ingredient, this lightweight serum firms the skin, fights breakouts, and controls sebum production as well! It's a great serum for all skin types. Size: 40 mL To use: Apply 3-4 drops of the TIA'M Vita B3 Source after cleansing and toning. If you have sensitive skin, use 1-2 drops instead.