Hair ResQ Thickening & Strengthening Hair Oil deeply nourishes & strengthens hair and encourages healthy hair growth. It's formulated with Biotin & Peppermint Oil to help strengthen and revitalize hair plus Caffeine, Castor Oil, & Rosemary Oil to energize hair follicles and encourage healthy hair growth. This versatile oil can be applied directly to scalp or to hair on the mid-length to ends, depending on hair needs.