Retinols should be used at night only, making sure your skin is protected during the day with a sunscreen. This is because this powerful substance removes dead skin cells from the upper layer of the skin’s surface. This resultantly makes skin more vulnerable to sun damage. Moreover, you should begin by applying retinol 3 times a week and then gradually increase the frequency. This is due to the strength of retinol. By increasing the frequency gradually, you allow your skin to become familiar with the product, therefore minimising irritation. It’s also important that you apply a high-quality moisturiser after using retinol to help soothe potential dryness or irritation. As well as this, in the morning, make sure to apply SPF30+. This will protect your skin from the potential sun damage that retinol can lead to.