展开You don’t have to be a skincare loyalist to have heard of niacinamide; it’s considered one of the best vitamins (B3, to be precise) on the block, known to keep the skin firm and healthy-looking. The Paula’s Choice 10% Niacinamide Booster puts the ingredient front and centre; just apply it once or twice daily – or, even better, add two-to-three drops to your moisturiser or serum – for a hydrated visage and visibly reduced pores and breakout marks.