If Scarlett Johansson's makeup artist trusts one product to prep her skin before a red carpet appearance, it's worth paying attention to - especially when it costs under £6.
We've been on the lookout for the best Amazon Prime Day deals up for grabs and discovered that The INKEY List 2% Hyaluronic Acid Face Serum, the go-to of Johansson's makeup artist Frankie Boyd, has been included in a seriously-impressive deal.