Does Saw Palmetto Work for Hair Loss? Evidence, Benefits and Side Effects

Male pattern or female pattern baldness, scientifically known as androgenetic alopecia (AGA), is a type of hair loss primarily influenced by genetics and the hormone dihydrotestosterone (DHT).

While medications have been clinically proven and trialled to manage AGA, many individuals also wonder about natural forms of DHT blockers. An example of this is the plant-based extract of saw palmetto. But how effective is this remedy? 

In this article, we will examine how effective saw palmetto is in the treatment of AGA as well as how it works, its risks, and how it compares to more traditional treatment options.

What Causes Pattern Baldness in Men and Women?

Androgenetic alopecia is a common genetic condition characterised by progressive damage to hair follicles, leading to hair thinning and hair loss. Hair follicles are damaged by the hormone dihydrotestosterone (DHT). While DHT is essential during the sexual maturation of the body, it can cause hair loss in individuals who are genetically susceptible to its damaging effects. 

This damage disrupts the hair growth cycle, leading to a shorter growth phase (anagen) and worsening shedding over time. 

Conventional Treatments

Traditional treatments for AGA include trialled and tested medications such as:

Finasteride: a ‘DHT-blocker’ medication that reduces the levels of DHT within the body, thereby reducing hair loss.

Minoxidil: a medication that acts like an energy drink for the hair and boosts growth by increasing blood flow to follicles and lengthening the anagen phase.

Platelet-Rich Plasma (PRP): a more invasive treatment option which involves taking a sample of a patient’s blood, concentrating the platelets within it (which are rich in growth factors) and reinjecting this solution back into the scalp. The growth factors released by the platelets are thought to activate hair follicles and enhance growth. 

What is Saw Palmetto, and Can It Help With Hair Loss? 

Saw palmetto (Serenoa repens) is a dwarf palm tree native to the southeastern United States. It was previously well known for its berries, which are used to make supplements. This plant contains ‘DHT-blocking’ compounds, such as phytosterols, flavonoids, and fatty acids, which have been found to reduce DHT levels in the scalp mildly. By lowering DHT, this plant can help with hair loss.

Saw palmetto is also used to address various aspects of men’s health, including the treatment of BPH (enlarged prostate), inflammation, improving urinary function, boosting libido and fertility, and reducing inflammation. 

Saw Palmetto vs Finasteride: How Do They Compare?

Although finasteride is stronger and has a quicker effect, saw palmetto can still provide minimal benefits, which can help manage mild hair loss.

Let’s examine their differences. 

Feature	Saw Palmetto	Finasteride
Category	Natural supplement	Prescription drug
Effectiveness	Less potent; may work for mild cases	Clinically proven; more potent DHT blocker
Hair regrowth	Some potential but less consistent	More likely to stop hair loss and promote regrowth
Side effects	Milder: may include dizziness, headache, and digestive issues	Possible sexual side effects, rare mood changes
Best for	Mild hair loss, those wanting a natural option	Moderate to severe hair loss, those needing proven results

Does Research Support Saw Palmetto for Hair Loss? 

Some studies have shown that saw palmetto can improve hair density and reduce hair loss by blocking DHT to a mild extent. 

Here are a few examples of conducted trials:

Key Randomised Controlled Trials

In 2002, a randomised, double-blind, placebo-controlled pilot study was conducted using men aged 23–64 with mild to moderate AGA to compare 200 mg of oral saw palmetto (plus 50 mg β-sitosterol) twice daily to a placebo for ~21 weeks. Approximately 60% of treated men exhibited visible improvement in hair loss, compared to 11% in the placebo group. 

Also, a 2012 study that compared 320 mg daily saw palmetto to 1 mg finasteride over 24 months in 100 men showed that 38% in the Saw Palmetto group had hair improvements, but mainly on the vertex, while 68% in the Finasteride group had hair growth improvement, indicating saw Palmetto to be less effective. 

While saw palmetto may be less effective, it is generally better tolerated with fewer side effects.

Systematic Reviews & Meta-Analyses

The effectiveness of topical and oral saw palmetto use in AGA and telogen effluvium was analysed in multiple randomised control trials and cohort studies through systematic reviews (e.g., a 2020 Karger review).

Sixty per cent of users reported an improved quality of their hair, 27% reported increased hair growth, 83% experienced thicker hair density, and 52% reported a halt in the progression of AGA. Saw palmetto was markedly weaker than finasteride in stimulating the growth of the hair.

The studies were limited by their small sample size and duration. They frequently relied on a combination of supplements, which makes it difficult to determine the single effect of saw palmetto.

The evidence does suggest, however, that saw palmetto can reduce hair loss, although not as effectively as Finasteride. 

Saw Palmetto Dosage, Forms, and Best Use for Hair Growth

The correct dosage and form used are crucial for safely achieving results with saw palmetto regarding hair loss.

Formulation Recommendations: 

Use a standardised extract that is made up of 85-95% fatty acids and sterols, the active constituents which are supposed to inhibit DHT. Raw berry powders should be avoided, as they are less effective.

Recommended Dosage:

The standard dose is 160 mg twice daily or 320 mg once daily, taken with food.

Combining with Other Botanicals:

Saw palmetto can be used in combination with pumpkin seed oil and Pygeum africanum, both of which may enhance its effects on hair growth.

How Long to See Results:

Expect visible improvements within 3 to 6 months of regular use. 

While this supplement may be effective, results can vary on how the body absorbs it, as well as whether it’s taken alone or in combination with other treatments such as conventional drugs like minoxidil. 

Is Saw Palmetto Safe? Side Effects and Warnings 

Generally, Saw Palmetto is safe.

Mild side effects include diarrhoea, headache, fatigue, reduced libido, nausea, vomiting, and vertigo.

Importantly, this supplement is strongly discouraged for use in children, pregnant and breastfeeding women due to its association with birth defects. 

Expert Tips: How to Choose and Track Saw Palmetto Supplements

When considering saw palmetto for hair loss, keep these tips in mind to achieve safe, high-quality, and effective results.

Choose a High-Quality Supplement

Choose a standardised extract (85-95% fatty acids) which has undergone third-party testing in terms of safety and efficacy. It’s always best practice to verify that these supplements have certifications. In the UK, you can check for the THR (Traditional Herbal Registration) mark or brands that follow GMP standards. In the US, third-party certifications such as USP or NSF can help ensure quality.

Track Your Progress

Monitor hair density and shedding over time using clear photos or other tools, such as a phototrichogram. This will help you determine whether saw palmetto is effective for you.

Consult a Dermatologist if Needed

If there is no evident progress within 3-6 months or hair loss worsens, consult a dermatologist or trichologist for more specialist advice. They may assist in providing you with different or combined therapies.

Expert Opinion: Is Saw Palmetto Worth Trying?

Hair loss experts recommend saw palmetto to those who prefer a more natural solution that doesn’t mind milder effects and progress. 

“Finasteride remains the gold standard medical treatment recommended by doctors for Andogenetic Alopecia, but it is understandable when patients choose a gentler option to start with.”

Says Dr. Dilan, of Treatment Rooms London.

If you’re exploring your treatment options and thinking about getting a hair transplant to address your hair loss, feel free to get in touch and book an initial virtual consultation with our friendly team at The Treatment Rooms London. They will be able to guide you towards a suitable treatment option.

Saw Palmetto & Hair Loss FAQS 

1. Can women use saw palmetto for hair loss?
   Yes, it can be used in women with hair thinning or shedding.
   
   
2. How long does it take to see results with saw palmetto?
   Typically, 2 to 4 months of regular use is required.
   
   
3. Is saw palmetto as effective as finasteride?
   No, finasteride is stronger and more effective for most people.
   
   
4. What are the side effects of saw palmetto?
   Common side effects include headaches, stomach upset, and dizziness.
   
   
5. Can I use saw palmetto in combination with minoxidil?
   Yes, it’s safe and is often used in combination for better results.
   
   
6. Should I take saw palmetto with food?
   Yes, saw palmetto works best when taken with food, preferably healthy fats.
   
   
7. Are there any drug interactions with saw palmetto?
   Yes, saw palmetto can increase the risk of bleeding if you are taking blood thinners. Also, if you’re already taking prescription DHT-blockers like finasteride, combining them with saw palmetto could potentially increase the chance of side effects, since both act on the same hormone pathway. We’d always recommend checking with your doctor or pharmacist before starting saw palmetto if you’re on other medications.

Conclusion

Saw palmetto is not a magic formula, but it can help slow hair loss in mild cases of androgenetic alopecia. With limited yet positive clinical evidence, it is a milder (though still effective) form of finasteride for those worried about side effects. When considering natural solutions, saw palmetto might be an essential addition to your hair care regimen, but with reasonable expectations and professional advice.

Get in Touch

Ready to elevate your hair restoration journey? Book a free consultation call with our London-based FUE hair transplant clinic.

Our award-winning team, including leading London hair transplant surgeons Dr Fernando and Dr Vara, are here to support you every step of the way.

References 

Evron, E., Juhasz, M., Babadjouni, A. and Mesinkovska, N.A., 2020. Natural hair supplement: friend or foe? Saw palmetto, a systematic review of alopecia. Skin Appendage Disorders, 6(6), pp.329–337. Available at: https://doi.org/10.1159/000509905 [Accessed 11 Jul. 2025].

Ho, C.H., Sood, T. and Zito, P.M., 2023. Androgenetic Alopecia. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. Available at: https://www.ncbi.nlm.nih.gov/books/NBK430924/ [Accessed 4 Jul. 2025].

Institute of Medicine and National Research Council, 2005. Appendix K: Prototype focused monograph—Review of anti-androgenic risks of saw palmetto ingestion by women. In: Dietary Supplements: A Framework for Evaluating Safety. Washington, DC: National Academies Press. Available at: https://www.ncbi.nlm.nih.gov/books/NBK216069/ [Accessed 1 July 2025].

Le, A., 2025. Saw Palmetto vs Finasteride. PonteVita Rx, 3 June. Available at: https://pontevitarx.com/saw-palmetto-vs-finasteride/ [Accessed 5 Jul. 2025].

Prager, N., Bickett, K., French, N. and Marcovici, G., 2002. Randomised, double-blind, placebo-controlled trial of oral saw palmetto in men with androgenetic alopecia. Journal of Alternative and Complementary Medicine, 8(2), pp.143–152.

Vergara, R., Fernández, L., Rodríguez, D., Pineda, A. and Valenzuela, F., 2012. Comparative efficacy of saw palmetto and finasteride in androgenetic alopecia: A randomised clinical trial. International Journal of Dermatology, 51(6), pp.688–694.