If you’ve been searching for the best possible solutions for thinning hair, chances are you’ve landed on products containing castor oil. It has easily become one of the most talked about ingredients for boosting hair growth, with folks across the Internet claiming the oil works miracles on anywhere from their roots to their eyebrows. But how many of these legendary results can be attributed to castor oil alone? We asked a dermatologist to squash some of our qualms and lend a bit of truth.