A serum gives your skin a vitamin boost and properly moisturises. This product from Babor properly moisturises your skin.
From OnBuy
Babor - Ampoule Concentrates - Active Purifier (For Oily, Acne-prone Skin) 358732 - 7x2ml/0.06oz
Skincity
AMPOULE Active Purifier
This product is also available at 2 unverified merchants.