Black mustard oil is a product used in Ayurvedic medicine, known as Ayurveda. This oil is obtained from black mustard seeds and is used in cooking as well as in beauty and health treatments. In Ayurvedic medicine, black mustard oil is believed to have medicinal properties and is used to relieve muscle and joint pain, improve blood circulation and promote healthy hair and skin. It is also used as an ingredient in some home remedies and personal care products.