Laurel is another plant that has been prized for its uses in medicine and cooking. Laurel leaves have been used in various types of cooking and condiments and fruit is one of the ingredients in All Spice. Bay has long been used in hair tonics, as it is said to be for the scalp, as well as to treat hair and promote growth. Bay leaf essential oil is also said to be good for aches, pains, circulation and rheumatism, as well as helping the immune system when fighting the disease.