Castor Oil and ricinoleic acid are thought to increase absorption in the skin and are sometimes used in the treatment of various skin conditions, including dermatosis, psoriasis, and acne. There are also anecdotal reports of Castor Oil promoting hair growth, including eyelashes. By serving as a source of ricinoleic acid and several other fatty acids, Castor Oil has some properties that make it an extremely useful hair & skincare product, particularly for the face.