With Organic Cold Pressed Castor Oil. Get longer, Thicker Lashes & Brows.... Naturally. Treatment for Thinning and Sparse Lashes & Brows. Contains: Ointment and 1 Applicator Brush. Double Lash & Brow is a 6 week treatment that combines organic Castor Oil and plant extracts to provide intense nourishment to thinning lashes and brows. Rich in omega 6 fatty acids, Castor Oil has the unique ability to penetrate deeply into the hair and skin encouraging growth and thickness. It can also give your lashes and brows a richer, darker color. used nightly and applied directly to the lashes and brows, visible results should be noticeable in 2 to 3 weeks.