Dermalogica MediBac Clearing - Overnight Clearing Gel contains a vitamin B complex of niacinamide, biotin, zinc gluconate along with yeast extract, caffeine and nordihydroguaiaretic acid. These special ingredients soothe irritation, control oil production and purify the complexion. Rosemary and spiraea extracts kill and prevent bacteria while salicylic acid encourages natural exfoliation, working to cleanse clogged pores in order to prevent future breakouts. Tea tree oil promotes skin healing, helping to return the skin to its healthy, clear state.