If you've only briefly heard of Pixi, it was probably thanks to the Glow Tonic, which has become a skincare favourite among beauty editors and makeup artists. Due to the success of the exfoliating toner, the brand has since expanded its range including the Vitamin-C and Retinol Tonics. If you're not sure which to try first, the Pixi Best of Tonics (£20) let's you trial them all before buying the full-size versions.