Hyaluronic Acid 2% + B5 from The Ordinary is a lightweight water-based serum formulated with a combination of low, medium, and high molecular-weight hyaluronic acid, and a hyaluronic acid crosspolymer for multi-depth hydration.
 
The Ordinary recommends performing a patch test prior to incorporating a new product into your skin care routine. 
 
Apply a few drops to face AM and PM before creams.