Lesser-known mandelic acid is a great choice for sensitive skin. It's a gentler alternative to other alpha hydroxy acids, yet offers up similar line-smoothing and pore-refining benefits. Use The Ordinary Mandelic Acid 10% + HA (£6) a few times a week in the evening. Once your skin has built up resilience, it can be used on a daily basis and as part of your everyday skin-care routine.