Hair loss has a profound impact on affected people – not only physically, but also socially. According to Jaller et al., a telephone survey of 1536 participants has shown that 70% believe hair to be an important aspect of attractiveness. 62% of the respondents, on the other hand, report that hair loss has affected their self-esteem. Sadly, as much as 21% who reported hair loss reported feelings of depression.
Given the vital role of hair on one's physical appearance and confidence, more and more people are looking for novel approaches towards hair growth. One popular option is that of nutraceuticals. These food additives or supplements may help support certain aspects of health, which is why more and more people are interested in these products.
With regards to hair health, several nutraceuticals have been studied. One example researchers have looked at is the rosemary leaf.
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What is a Rosemary Leaf?
The needle-like rosemary leaf is a sight for sore eyes, as it is always flanked by beautiful blue or purple flowers. More than just decorative, rosemary – especially its leaves – has long been used for cooking.
Apart from culinary use, rosemary leaf also has a long history of traditional use for a variety of purposes. This is not a new finding though, as many ancient cultures referenced it. It goes as far back as 5000 BC, with the rosemary leaf being mentioned in Mesopotamian cuneiform. The ancient Egyptians, on the other hand, used the plant in burial rituals.
The Greeks and Romans also wrote about rosemary leaf's traditional uses – Pliny the Elder in "Natural History," and Pedanius Dioscorides in "De Materia Medica." Traditional use of rosemary leaf has included things like:
- Memory and focus support
- General stress support
- General fatigue support
- Oral and gum health
- Digestive comfort
These are traditional uses, not approved medical claims, and rosemary leaf is not intended to diagnose, treat, cure, or prevent any disease.
Rosemary Leaf and Hair Health
Beyond its traditional uses, researchers have also studied whether rosemary leaf may support hair health.
Rosemary leaf is rich in phenols, antioxidant compounds that may help defend cells from free radicals. These free radicals can be generated by everyday exposures like smoking, pollution, and UV rays, and may contribute to a dull hair color and reduced shine over time.
With its antioxidant properties, rosemary leaf may help support hair strands against everyday environmental exposure. Some early research has also looked at whether it may help support the appearance of damaged hair, though this research is preliminary.
Rosemary leaf also contains vitamins and minerals that play a role in normal hair growth:
- Vitamin A. Important for eye health, and adequate Vitamin A levels also support normal hair follicle function.
- Vitamin B6. Also known as Pyridoxine, it plays a role in the production of L-Cystine, an amino acid involved in hair strength.
- Vitamin C. Supports normal collagen production, which plays a role in hair strength.
- Iron. Adequate iron levels are important for normal hair growth, which is particularly relevant for women with iron deficiency, who commonly experience hair thinning.
What the Research Looks At
Hormone-Related Hair Thinning
Some research has looked at rosemary leaf in the context of androgenetic alopecia, a common pattern of hair thinning associated with the hormone dihydrotestosterone (DHT). A small clinical study by Panahi et al. compared a topical rosemary preparation to topical Minoxidil, an FDA-approved treatment for androgenetic alopecia, over 6 months.
Both groups in that study showed an increase in hair count over the study period, with less scalp itching reported in the rosemary group than the Minoxidil group. This was a single, small study, and it does not establish that rosemary leaf is equivalent or superior to Minoxidil, which remains an FDA-approved treatment for this condition. Anyone considering treatment for hair loss should speak with a dermatologist about proven options; rosemary leaf has not been evaluated or approved by the FDA for this purpose.
It's also worth noting that this and related research, including a mouse study by Murata et al. looking at testosterone-treated mice, generally involved topical application of rosemary oil or extract directly to the skin or scalp — not oral intake. The researchers suggested the effect may be related to rosemary's interaction with androgenic hormone activity at the skin level, but this remains an early, preliminary finding from animal and small human studies, not an established mechanism.
Inflammatory and Microbial Factors
Rosemary leaf has been studied for its anti-inflammatory properties, which researchers have looked at in the context of inflammatory scalp conditions such as scarring alopecia and folliculitis decalvans — both serious conditions that should be diagnosed and managed by a dermatologist, not self-treated.
Separately, laboratory research has examined rosemary leaf's antimicrobial properties, including activity against Staphylococcus aureus, a bacteria associated with folliculitis (study). This is laboratory research and has not been established as an effective treatment for folliculitis in people.
Stress-Related Hair Shedding
A Journal of Biomedical Science study looked at rosemary leaf in the context of general stress support. High stress levels are a known contributor to telogen effluvium (temporary hair shedding) and can play a role in alopecia areata, an autoimmune condition. The cited research used doses in the range of 4 to 6 grams; this is not a recommended supplement dose, and anyone considering oral rosemary leaf supplementation should check labeled directions and speak with a healthcare provider.
Safety Information
This information is intended for healthy adults. Rosemary leaf supplements are not intended for use by children.
Oral rosemary leaf intake above labeled amounts may be associated with adverse effects, including sun sensitivity, skin redness, allergic reactions, vomiting, kidney irritation, and uterine bleeding in women. Always follow the dosing on the product label rather than amounts referenced in research studies, which may not reflect a safe or appropriate consumer dose.
Rosemary leaf should not be used by pregnant or breastfeeding women. People with aspirin allergies, bleeding disorders, or seizure disorders, or anyone taking prescription medication, should talk to a healthcare provider before use, as rosemary leaf may interact with certain medications.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
