Serums are one of skincare’s greatest champions – saving the faces of women everywhere. Whether you need extra moisture, redness-reducing ingredients or brightening action, serums can totally deliver the goods. But wouldn’t it be great if you could make them work even better than they already do?

According to Allure Magazine, you can help your serums (like Dermalogica – Skin Hydrating Booster) become even more potent by trapping them against your skin with a heavy moisturizer. Thick creams with natural butters, petrolatum, oils or waxes work best, so think along the lines of a product like AHAVA Beauty Before Age Uplift Day Cream SPF 20.

However, you don’t want to do this with serums that have really potent ingredients already, like retinoids, acids, vitamin C or hydroquinone. Sealing them in with a moisturizer can potentially double their strength, which could result in irritation that you didn’t sign up for. It’s also not a good idea to try this method if you’re prone to serious acne, as rich moisturizers in general can clog pores. But if you have normal or dry skin and basic serums, go for it! You’ll be glad you did.