Now, rosemary is one of the more popular oils that are commonly used in natural hair care products. The great thing is, it actually works! Rosemary oil has some general health benefits that also encourages hair growth. It has anti-inflammatory properties, improves circulation and promotes nerve growth. Rosemary is known to increase circulation. So, it can prevent your hair follicles from being depleted and starved of significant blood supply. When this happens, the hair follicles will start to die off and hair loss begins. It’s compared to minoxidil which we all know as Rogaine. Studies show that it is just as effective if not more without the added chemicals.