Castor oil's fatty acids are natural humectants, substances used to moisturize the skin by preventing water loss. This effect can promote good skin health, relieve dryness, and soothe skin inflammation. It may also have the potential to accelerate wound healing. Castor oil has been claimed to have a slew of benefits including strengthening strands, promoting hair growth, and nourishing dry scalp. And while the oil itself likely can't make the hair grow, it's loved for its ability to create a healthier environment on the scalp that makes for way better hair growth.