"When thinking about hair growth, you need to take a whole-body approach and address the root causes," says dermatologist Dr. Mina Amin. Even something as simple as the shampoo you use and how often you apply it can be to blame: “Washing your hair too much with harsh shampoos can dry out your scalp and cause irritation,

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.