The Codex Antu Brightening Serum (£85) is the third product in the brand's Antu range, all of which feature a patent-pending ingredient complex created with bio-actives from three plants found in the Patagonian rainforest that have been combined with hydrolyzed hyaluronic acid to protect and support the microbiome as well as strengthen the skin barrier. The serum, in particular, doesn't just reinforce the skin barrier, it also promises to leave skin visibly brighter, smoother, and plumper after continued use.