Rosemary Oil for Androgenetic Alopecia
BBased on 13 studies (2 meta-analyses, 1 RCT) with 50 total participants. 11/13 studies show positive effects.
The Bottom Line
Moderate evidence suggests rosemary oil may help support hair growth in androgenetic alopecia, though more large-scale clinical trials are needed to confirm its effectiveness.
- 9 out of 10 studies report positive effects
- Included in Canadian consensus guidelines as a complementary option
- May work through improved scalp circulation and anti-inflammatory activity
- More controlled clinical trials with larger sample sizes are needed
Key Study Findings
Population: Androgenetic alopecia rat model
Population: Males with androgenetic alopecia
Key Statistics
13
Studies
50
Participants
Positive
Grade
Referenced Papers
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- topical:
- 2-5% dilution, applied to scalp
Upper limit: Topical only; do not ingest concentrated oil
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Positive | -- |
| None | 24 weeks | Positive | -- |
| Various non-prescription agents: procyanidin, cetirizine, caffeine, Oryza sativa bran, pumpkin seed | -- | Positive | -- |
| varies by remedy and study | -- | Positive | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| various CAMs: pumpkin seed oil, saw palmetto, melatonin extract, caffeine extract, rosemary oil | -- | Positive | -- |
| not specified | -- | Positive | -- |
Best taken: Apply diluted oil to scalp and massage for 5 minutes; leave on 30+ minutes or overnight
Safety & Side Effects
Reported Side Effects
- ⚠ Contact dermatitis or scalp irritation
- ⚠ Allergic reactions in sensitive individuals
- ⚠ Eye irritation if contact occurs
Known Interactions
- ● Anticoagulants (rosemary may have mild blood-thinning properties topically)
- ● Other topical hair loss treatments (use at separate times to avoid irritation)
Tolerable upper intake: Topical only; do not ingest concentrated oil
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Rosemary Oil help with Androgenetic Alopecia?
How much Rosemary Oil should I take for Androgenetic Alopecia?
Are there side effects of Rosemary Oil?
How strong is the evidence for Rosemary Oil and Androgenetic Alopecia?
Related Evidence
Other ingredients for Androgenetic Alopecia
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.