If you have been trying to grow your hair back or just want it to look thicker and healthier, you’ve probably heard about castor oil. It's one of those age-old beauty hacks passed down by grandmothers ...

Susan Bard, MD, is a board-certified general and procedural dermatologist with the American Board of Dermatology and a Fellow of the American College of Mohs Surgery. Ricinoleic acid, a primary ...