interspersed with products from a few rival brands – namely COSRX’s lip sleep mask (£22, Lookfantastic.com) – to see if the results differed. We used the balm during the day, too ...

I use the Cosrx toner every day ... s mask that made my skin the most hydrated it has ever been and Prada’s lip balm that kept me from doing a $700 lip blush treatment. $24 Buy on ...

Case in point: Today, one of my favorites, CosRx Propolis Ampoule Glow Boosting Serum, is 50% off — down to a mere $14. This epic skin hydrator from beloved K-beauty brand CosRx promises to lend even ...