According to Dr. Harth, the optimal dilution ratio is 15 drops of rosemary oil for every 6 teaspoons of your carrier oil (olive oil, argan oil, and jojoba oil make great options, too). Once combined, massage it into your scalp and leave it for 10 minutes before washing it out.
"Rosemary essential oil can help stimulate healthy, thick hair," affirms Dr. Graf. "The oil can speed up the process of cell turnover and growth, which can work as a natural remedy to grow thicker hair. Since it is an anti-inflammatory, it is used for [preventing hair loss], as well as regrowth."
Topical Use Rosemary and other essential oils are readily absorbed into your bloodstream when you apply them to your skin. It's generally advised to dilute essential oils with a neutral carrier oil, such as jojoba oil. This helps prevent potential irritation of your skin and premature evaporation of the oil ( 43 ).
Can I leave rosemary oil on my hair overnight? Yes, a rosemary hair oil treatment can be applied overnight. All you have to do is mix a few drops of rosemary essential oil with a carrier oil, like coconut, jojoba, argan oil etc. Apply this combination to your scalp and hair.
Apply it. Dilute it with a carrier oil, such as jojoba oil, and then apply it to the soles of your feet or other parts of your body. (Tip – use 1 drop of rosemary oil per 1 teaspoon of carrier oil for children and 3 to 6 drops of rosemary per 1 teaspoon of carrier oil for adults).
But taking undiluted rosemary oil or very large amounts of rosemary leaf is likely unsafe. Taking large amounts of rosemary can cause vomiting, sun sensitivity, and skin redness. When applied to the skin: Rosemary oil is possibly safe for most people. It might cause allergic reactions in some people.
Rosemary oil is often used as a home remedy for hair growth, although research is still underway in regards to its effectiveness in treating hair loss. However, direct application of rosemary oil on the scalp is not recommended because it may cause itching and irritation in some people.
Can I leave rosemary oil on my hair overnight? Yes, a rosemary hair oil treatment can be applied overnight. All you have to do is mix a few drops of rosemary essential oil with a carrier oil, like coconut, jojoba, argan oil etc. Apply this combination to your scalp and hair.
Rosemary has been used by many to promote hair growth successfully. Using rosemary essential oil could very well do the same for you. Science and personal experience together both strongly suggest the essential oil does protect against hair loss, particularly that related to male or female pattern baldness.
Likewise, be careful not to apply too much to your scalp. Rosemary essential oil has been known to irritate the skin. It may cause discomfort, but no health dangers. To avoid skin irritation, dilute the oil with a carrier oil or other product before applying it.