Synergie Vitamin B serum is our best seller! It contains Niacinamide (Vitamin B3), that helps to rejuvenate and strengthen the skin and relieve dryness, help fade pigmentation and reduce excess sebum. It also helps to stimulate collagen production. It's a must have product in your regime. Your skin will glow and look and feel dewy after only a couple of weeks of using it. Helps to calm irritated and rosacea skin.