Collagen is the main structural protein in our skin. I've had a dermatologist liken it to a mattress frame because, like a mattress without a frame, skin without collagen starts to sag and crinkle. Unfortunately, the older you get, the less collagen you have, which is why products like the Algenist Genius Sleeping Collagen (£88) exist. As the name suggests, this night cream is chock-full of collagen, which, when mixed with the brand's proprietary alguronic acid (a humectant that helps the skin retain moisture) and ceramides, helps leave the skin firmer, springier, and a lot more moisturised.
Lots of products say they contain collagen, but what makes this product stand out is that collagen is the first ingredient on the label, which means it makes up a decent chunk of the formula. But Algenist went even further. Unlike most collagen-spiked creams that contain collagen derived from animal sources, Algenist's collagen is made from plants, making it one of the only vegan options on the market.