Rosemary is a well-known herb from the Mediterranean region; its essential oil is extracted from a small, light blue flower and its leaves to produce fragrance for the essential oil. Rosemary is sometimes used as an ingredient in perfumes as well as for food flavoring.

Many medical conditions, including baldness, acne, rheumatic pain, and circulatory blockages, have been demonstrated to be managed with rosemary oil. The effects of rosemary oil on the brain and central nervous system (CNS) are also very positive. It can also assist to calm the mind and improve mental awareness. When applied to the scalp, rosemary can significantly improve blood flow, which can stimulate the growth of hair follicles. Additionally, it shields the skin from sunburn....

https://healthwatchline.com/2023/06/10/benefits-of-rosemary-oil-for-hair-growth-plus-how-to-make-yours-at-home/