You can yes but you really do not need to as this serum is an all-in-one total care and anti-ageing and replaces all your other skincare products. It provides everything your skin needs to hydrate, repair, protect and rejuvenate. It is designed to also treat the eye area for fine lines, puffing and dark shadows.
It would also be a pity to combine it with other products as this serum is totally free of any nasty ingredients and the existing product you are thinking of using possibly contain some synthetic chemicals.