The leaf and its oil are commonly used in food and also to make medicine. Rosemary seems to increase blood circulation when applied to the scalp, which might help hair follicles grow. Rosemary extract might also help protect the skin from sun damage.
Rosemary is used to adding aromatic flavour to soups, sauces, stews, roasts, and stuffing. leaves also can be used to prepare tea, essential oil, and liquid extract.