Scalp oiling boosts hair growth by stimulating blood flow to the scalp. Bridgette Hill, a trichologist and scalp therapist, explains how: “Certain oils are vasodilators: that means they widen the blood vessels.

Even if you're not dealing with hair loss or shedding, rosemary oil products can still deliver some ingredient benefits to your strands: 'Hair oils, including rosemary oil, are also great for those looking for natural approaches to growing smoother, softer, more manageable hair,' says board-certified dermatologist Dr. Brendan Camp, MD.

“Using too much coconut oil on your hair may weigh it down, so start off with a small amount and adjust as necessary,” advises Anabel. Those with finer hair or naturally oily scalps may find their hair looks and feels greasy after use.

Wondering if the viral TikTok rosemary oil can strengthen and grow hair? We consulted dermatologists and experts on the benefits of rosemary oil, side effects, and more.