The Control Clearing Serum In Emulsion 5α by Dr. Ceuracle helps control the skin's sebum production. Its special formula, based on Sepicontrol A5, reduces excess sebum and shine thanks to a patented formula developed by Dr. Ceuracle's research and development center. **Sepicontrol A5: Capryloyl Glycone, Cinnamomum Zeylanicum, Sarcosine. This product works based on technology that controls 5-alpha reductase, a hormone that triggers abnormal sebum secretion when the skin is out of balance. While oily skin tends to shine on the surface, it is often very dehydrated beneath. An exclusive synergy of mushroom extracts provides intense nourishment deep within the skin.