Rosemary oil became one of the most searched hair growth remedies after a 2015 clinical trial compared it directly to minoxidil 2% — the active ingredient in Rogaine — and found comparable results for hair growth over 6 months. That’s not a minor finding. Most natural hair remedies have weak or anecdotal evidence. This one has a randomized controlled trial.
The difference is that rosemary oil produced significantly less scalp itching than minoxidil, suggesting better tolerability. Since then the research has expanded and the DIY rosemary oil community has grown massively — particularly the rosemary and cloves combination, which adds the hair-thickening benefits of cloves to the circulation-boosting effects of rosemary. Here’s everything you need to know.
Why Rosemary Oil Works for Hair Growth
The primary mechanism is improved scalp circulation. Rosemary oil contains carnosic acid, which has been shown to stimulate nerve growth factor — relevant because nerve activity in the scalp is associated with follicle health. More directly, rosemary improves blood flow to the scalp, which increases the delivery of oxygen and nutrients to hair follicles.
It also has DHT-blocking properties. DHT (dihydrotestosterone) is the hormone responsible for androgenic hair loss — the pattern baldness type that affects both men and women. Rosemary inhibits 5-alpha reductase, the enzyme that converts testosterone to DHT. This is the same mechanism targeted by finasteride, a common hair loss medication. The inhibition from rosemary is gentler, but it’s real and documented.
Results from the clinical trial: at 6 months, both the minoxidil group and the rosemary oil group showed significantly increased hair count compared to baseline. The rosemary group had comparable hair count increases with fewer side effects. Most people in that trial used the oil consistently 2 times per week. That’s the minimum — daily is better for active hair loss.
What to Realistically Expect
Hair growth is slow regardless of what you use. Expect to see reduced shedding first — usually within 3 to 4 weeks of consistent use. New growth and increased density appear around weeks 8 to 12. The 6-month mark is when the full results are visible. People who quit at 6 weeks because they don’t see dramatic changes are almost always quitting right before the results would appear.
Rosemary oil works best for thinning hair, postpartum hair loss, hormonal hair loss, and stress-related shedding. It has more limited results for pattern baldness in areas where follicles are already completely inactive. If the scalp is shiny and smooth with no fine hairs visible, follicles in that area are unlikely to respond.
3 DIY Rosemary Oil Recipes for Hair Growth
Recipe 1 — Basic Rosemary Growth Oil (The Foundation)
This is the starting point and the most versatile version.
Ingredients: 4 tablespoons carrier oil (jojoba, castor oil, or coconut oil — jojoba most closely mimics scalp sebum), 10 to 15 drops rosemary essential oil.
How to make it: Mix in a dark glass dropper bottle. Shake before each use. Apply directly to scalp using the dropper, section by section. Massage for 3 to 5 minutes — the massage itself significantly boosts circulation and amplifies the results. Leave for minimum 2 hours, ideally overnight. Wash out with shampoo applied to dry hair first.
Use: 2 to 3 times per week minimum. Daily for active hair loss.
Recipe 2 — Rosemary and Cloves Growth Oil (Most Popular DIY)
Cloves contain eugenol, which improves scalp circulation and has been used in hair growth formulas for decades. The combination with rosemary creates a more potent circulation-boosting effect than either ingredient alone. This is the recipe that went viral and the one most people report the strongest results from.
Ingredients: 4 tablespoons castor oil (the thickness helps it stay on the scalp), 1 tablespoon jojoba oil, 10 drops rosemary essential oil, 1 teaspoon whole cloves.
How to make it: Warm the castor and jojoba oil gently — not hot, just warm. Add the whole cloves and let them infuse for 20 to 30 minutes on very low heat or steep in a warm water bath. Strain out the cloves. Once cooled to room temperature, add rosemary essential oil. Store in a dark glass bottle.
Use: Apply to scalp 2 to 3 times per week. Massage in for 5 minutes. Leave overnight. Results typically appear within 6 to 8 weeks of consistent use.
Recipe 3 — Rosemary Hair Growth Spray (Lightweight Daily Option)
For people who find oil too heavy for daily use, a rosemary spray delivers active compounds without the weight. This works particularly well as a daily maintenance treatment between oil applications.
Ingredients: 1 cup distilled water, 2 tablespoons dried rosemary (or 15 drops rosemary essential oil), 1 tablespoon aloe vera gel, optional: 5 drops peppermint essential oil (boosts circulation further).
How to make it: Boil dried rosemary in the water for 10 minutes to make a strong rosemary tea. Strain, let cool completely. Add aloe vera gel and mix well. If using rosemary essential oil instead of dried herb, add directly to cooled water with aloe. Pour into a spray bottle. Keep refrigerated — use within 7 days.
Use: Spray onto scalp daily, focusing on thinning areas. No need to rinse. Apply to damp or dry hair.
How to Apply Rosemary Oil for Best Results
Step 1 — Part the hair in sections: Apply oil directly to the scalp along each part, not to the hair lengths. The scalp is where it needs to work.
Step 2 — Massage for 3 to 5 minutes: Use fingertips in small circular motions across the entire scalp. The massage increases blood flow and is responsible for a significant portion of the result — studies on scalp massage alone show measurable hair thickening.
Step 3 — Leave it in: Minimum 2 hours. Overnight is significantly more effective. Use a shower cap or old t-shirt on your pillow.
Step 4 — Wash out correctly: Apply shampoo to dry oiled hair first, lather, then add water. This removes oil without needing 3 or 4 shampoo rounds.
Step 5 — Be consistent: Consistency over 6 months produces results. Occasional use produces nothing. Calendar reminders help — treat it like a supplement routine.
Common Mistakes That Reduce Results
- Using rosemary essential oil undiluted — it causes scalp irritation and chemical burns at full strength. Always dilute in carrier oil
- Applying to hair lengths instead of the scalp — hair growth happens at the follicle, not the shaft
- Leaving it on for only 20 to 30 minutes — insufficient contact time for the compounds to penetrate
- Skipping the massage — the mechanical stimulation of massage is part of the mechanism, not just an optional extra
- Quitting before 8 weeks — shedding sometimes temporarily increases in the first 2 to 3 weeks as the hair cycle adjusts. This is normal and resolves
The Short Version
Make the rosemary and cloves oil — castor oil base, whole cloves infused, rosemary essential oil added after cooling. Apply to scalp 2 to 3 times per week. Massage for 5 minutes. Leave overnight. Wash out with shampoo on dry hair. Make the spray for daily use between oil treatments. Give it 8 to 12 weeks before evaluating. The trial that compared it to minoxidil ran for 6 months — that’s the realistic timeline for full results.
