Rosemary oil can be used for hair growth primarily by applying it topically to the scalp in diluted form. Here are the most common and effective methods:

1. Scalp Massage: Mix about 5 drops of rosemary essential oil with a teaspoon of a carrier oil like jojoba, coconut, or argan oil. Massage this blend into the scalp using your fingertips, preferably after washing your hair. Leave it on for at least 5-10 minutes; you can also leave it overnight for better results. This stimulates blood circulation to hair follicles and supports growth.
2. Mixing into Hair Products: Add about 5 drops of rosemary oil per ounce to shampoos, conditioners, or hair masks. Use as usual during hair washing routines. This allows gradual exposure to rosemary oil benefits.
3. Root Spray: Combine a few drops of rosemary oil with 2 teaspoons of carrier oil and distilled water in a small spray bottle. Spray directly onto the scalp and gently massage for enhanced hair follicle stimulation.

Key application tips include using the oil on a clean scalp, focusing on areas experiencing hair thinning or loss, and adjusting frequency based on scalp response (starting 1-2 times per week and increasing if tolerated). Rosemary oil is known for its antioxidant, anti-inflammatory, and antimicrobial properties, which help improve scalp circulation, reduce hair follicle death, and alleviate scalp issues like itchiness or dandruff, all contributing to healthier hair growth. Studies have shown rosemary oil to be as effective as minoxidil (Rogaine) in some cases, with fewer side effects like scalp irritation. Always dilute rosemary essential oil before applying to avoid irritation and maximize benefits. This approach can support hair growth and scalp health naturally and safely when done consistently.