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topical · for hair loss & scalp health

Rosemary Oil

Reviewed by the Nimbera editorial team · Last updated May 2026

Panahi et al. 2015 Skinmed (PMID 25842469) - Randomized comparative trial in 100 adults with androgenetic alopecia found rosemary oil applied twice daily produced a significant increase in hair count at 6 months (p < 0.05 vs baseline), equivalent to minoxidil 2% with no significant between-group difference; scalp itching was less frequent in the rosemary group (p < 0.05).$8-18/month

How to use

Dilute rosemary essential oil to 2-3% in a carrier oil (e.g., jojoba or almond oil): add 6 drops of rosemary essential oil per 1 teaspoon (5 ml) of carrier oil. Massage into the scalp for 2-4 minutes. Leave on for at least 30 minutes or overnight, then shampoo out. Apply twice daily consistently for at least 6 months to evaluate results.

How it works

Rosemary oil contains carnosic acid and ursolic acid, which are believed to inhibit 5-alpha-reductase (the enzyme that converts testosterone to DHT, the primary driver of androgenetic hair loss). It also improves scalp microcirculation similarly to minoxidil, potentially stimulating dormant follicles.

Where to buy

Plant Therapy Rosemary 1,8-Cineole Essential Oil (~$8 / 10 ml), Majestic Pure Rosemary Essential Oil (~$9 / 30 ml), NOW Rosemary Oil (~$7 / 30 ml). Pre-diluted: Mielle Organics Rosemary Mint Scalp & Hair Strengthening Oil (~$9 / 2 oz), The Ordinary Multi-Peptide + Serum for Hair Density contains rosemary (~$18 / 60 ml).

Typical cost: $8-18/month

Safety notes

Never apply undiluted essential oil directly to the scalp - always use a carrier oil to avoid chemical burns or contact dermatitis. Perform a patch test 24 hours before full application. Avoid contact with eyes. Not recommended during pregnancy in therapeutic amounts. Rosemary oil may not be effective for scarring alopecias or alopecia areata, which have different mechanisms.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Panahi 2015 - Skinmed (PMID 25842469)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.