Lemongrass Vitamin Silk Protein Facial Oil has unique antifungal, antimicrobial and antiseptic chemical make-up that allows it to be an amazing astringent. With lemongrass oil in a toner or cleanser it assists the product with tightening and firming the skin. When lemongrass oil acts as an astringent it is also is very active in contracting pores while forming a barrier of hard tissue under your skin to protect against harmful agents found in the atmosphere.