Potassium Sorbate 

Potassium Sorbate is used as a mild preservative in cosmetic formulary. It is derived from Sorbic Acid which is naturally found in various plant or tree components. It is not full spectrum and works better against fungi than bacteria and as such should be used with another preservative in combination for synergy. 

Recommended Use Levels: 0.1% - 0.3%