Beard oil is a cosmetic product that is used to nourish both the skin under the beard and the beard itself in order to keep it "soft, shiny, and smooth". It is a blend of various ingredients, such as carrier oils and essential oils, that are used to address specific beard problems such as itching, sensitive skin, or dryness by going straight to the follicle in a similar fashion to hair conditioner. Beard oil is usually scented (though unscented versions are available) using a variety of natural and artificial, typically masculine, scents ranging from sweet to bitter and can be used to substitute cologne or aftershave.

Beard oil acts as a moisturizer that goes straight to the hair follicle and restricts hair from growing brittle, especially in cold, windy environments as these weather conditions cause the natural moisture of the beard area to wick. Hydration around this area helps prevent flaking, dandruff, and skin dryness. Some brands of beard oil may contain added vitamins or nutrients such as tocotrienols, or more commonly known, vitamin E.

Beard oil is formulated with a blend of carrier oils, such as jojoba and castor oil, and essential oils that add fragrance and a variety of vitamins, minerals, and antioxidants to your skin and beard. It promotes beard growth and thickness by helping your beard and skin stay healthy, conditioned, and hydrated. Beard oil can contain one or several types of essential oil, and some essential oils are best for oily, acne-prone skin, while others are more beneficial for dry or normal skin.

In summary, beard oil is a leave-in conditioning product that is used to moisturize and soften beard hair and the skin beneath it. It is formulated with a blend of carrier oils and essential oils that provide hydration, nourishment, and fragrance to the beard and skin. It can help prevent flaking, dandruff, and skin dryness, and promote beard growth and thickness.