But hair growth oils have arguably garnered the most hype in recent years — more specifically, rosemary oil. A 2013 study in mice with hair loss triggered by testosterone showed that rosemary leaf extract stimulated hair growth. Learn moreFAQsAdvertisementHow to use rosemary oil for hair growthThere are several different ways to use rosemary oil for hair growth. AdvertisementHow to dilute rosemary oil for hairKhanna recommends aiming for 2% rosemary oil when diluting it. Or, if you're adding the rosemary oil to an 8-ounce bottle of shampoo or conditioner, you'd add about 80 drops of rosemary oil.

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