I would highly recommend Medik8 Hydr8 B5 . It is a Professional Strength Skin Rehydration Serum with Hyaluronic Acid and Vitamin B5.

Hydr8 B5 has been designed to improve moisture levels within the skin. Contains skin-softening vitamin B5 (pantothenic acid) and moisture-enhancing hyaluronic acid to quench your skin and provide 24 hours of nonstop hydration.