Simple Booster Serum 10% Niacinamide (Vitamin B3) is a powerful all-rounder that is versatile and treats every skin type with kindness (from dry skin to oily and even sensitive skin). It contains high-performance ingredients to supercharge your skincare routine for instant, visible results. 10% Niacinamide (vitamin B3) and B5 hydrates, smooths and helps to strengthen and protect your skin barrier, and improve your skin texture. Dermatologically tested, non-comedogenic, contains no harsh chemicals that can upset your skin and free from alcohol, mineral oils, artificial colours and fragrance.