Ask any woman what is the number one hair issue she faces, and hair fall will be the most common answer. And to remedy this problem, we try almost anything that we can get our hands on. From anti-hair fall shampoos, hair masks to supplements, there is no stone we are willing to leave unturned. But more often than not, the most potent ingredients to help deal with hair loss lie no farther than our kitchen. One such incredible ingredient that we are sure you have overlooked is kalonji oil, also known as black seed oil. An important ingredient in a number of popular hair oils available in the market, kalonji oil boasts of a number of properties that help to not just restrict hair fall, but also help make hair thicker.