With both retinol and salicylic acid, the Dermalogica Retinol Clearing Oil (£69) promises to help tackle both breakouts and premature signs of ageing, which if you're in your 30s, you know exactly what I'm talking about. The formula — meant to be applied only a night — features retinyl proprionate (a vitamin A derivative that's milder and more stable than retinol) and salicylic acid suspended in an oil base. While it might not seem it, the oil is what's important here, as the combination of argan, rosehip, and golden jojoba oils was carefully developed to mimic skin's own natural oil production, which they've found not only leads to less breakouts, but also keeps skin soothed and happy, even as the retinyl proprionate is hard at work boosting cell turnover.