Rosemary oil is gaining popularity as a natural remedy for hair growth, potentially stimulating hair follicles and promoting healthier hair. It is believed to improve scalp circulation, reduce the hair loss hormone DHT, and offer anti-inflammatory and antioxidant properties. Various methods, including scalp massages and hair rinses, can be used to apply rosemary oil for hair growth.source https://timesofindia.indiatimes.com/life-style/beauty/how-to-use-rosemary-oil-to-grow-hair-in-bald-patches/articleshow/115376108.cms