Does saw palmetto help hair growth?

The evidence for saw palmetto and hair is real but narrow — it doesn't support saw palmetto as a category, or any dose on a random label, as a proven hair treatment. What exists is one placebo-controlled trial of a single specific extract, at a specific 160 mg/day dose, which found significantly more hair at 90 days and an even larger gap over placebo by 180 days, in men and separately in menopausal women. An older, much smaller pilot tested saw palmetto combined with another compound and found improvement, but didn't report a comparable placebo result.

What the evidence doesn't support

It doesn't support the idea that "saw palmetto" as an ingredient, at whatever dose and extraction method happens to be on a given label, grows hair. The positive trial below tested one proprietary, concentrated extract at 160 mg/day — not the standard 320 mg/day liposterolic extract that the much larger body of prostate research is built on, and not raw berry powder. It doesn't support saw palmetto over a hair-loss medication; this review reports only placebo-controlled results, and no trial compared saw palmetto against a drug for this use. It doesn't support treating diagnosed androgenetic alopecia in place of medical care — the placebo-controlled trial described below studied "self-perceived thinning hair" in generally healthy adults, not a clinically diagnosed condition. And it's one trial from one research group, not yet independently replicated, so it's an early result, not a settled one.

What the trials found

The most substantial evidence is a 2025-2026 randomized, double-blind, placebo-controlled trial testing a concentrated proprietary saw palmetto extract, 160 mg/day, in 60 healthy adults with self-perceived thinning hair — 40 on the active extract, 20 on placebo, half of them women. At the 90-day mark, the treated group showed significantly greater terminal hair count, vellus (fine, new) hair count, and total hair count than both their own baseline and the placebo group, with total hair count roughly 12 times greater than the placebo group's change. By 180 days, the advantage over placebo had grown roughly 40% larger than it was at 90 days, and the benefit held up separately in men and in menopausal women — one of the only saw palmetto trials of any kind to study women specifically. No treatment-related adverse events were reported in either published report of this trial.

That's a genuinely positive, well-designed result, and it's also a single trial: 60 people, one manufacturer's specific extract, one research site, not yet confirmed by an independent group. It doesn't tell you what a different saw palmetto product, at a different dose or made a different way, would do.

The older evidence is weaker. A 2002 pilot trial gave 10 men with mild-to-moderate androgenetic alopecia a combination of saw palmetto extract and beta-sitosterol — not saw palmetto by itself — while 9 more served as a placebo-controlled comparison group. Investigators rated 6 of the 10 treated men improved at the final visit, based on photographs rather than an objective hair count, but the published abstract doesn't report how the placebo group did, which makes it impossible to know how much of that 6-of-10 result exceeds what placebo alone would show.

Two things worth noting about the field overall: nothing here is from the same, much larger trials that tested saw palmetto for prostate and urinary symptoms — those trials, at the standard 320 mg/day dose, didn't measure hair at all. And no trial we found has tested a topical saw palmetto product for hair, only oral extract; see saw palmetto oil and topical use for that gap.

Questions people ask

Does saw palmetto help with hair loss?

One placebo-controlled trial of a specific 160 mg/day extract found more hair at 90 and 180 days than placebo, in men and menopausal women. That's a genuine positive result from one trial, not a settled fact about "saw palmetto" generally — it hasn't been independently replicated, and it tested a different extract and dose than most saw palmetto research.

How much saw palmetto should I take for hair loss?

The trial that found a benefit used 160 mg/day of one specific, concentrated proprietary extract — not the standard 320 mg/day extract used in most saw palmetto research, and not comparable to a raw-powder capsule of the same milligram amount. There's no established dose for hair loss beyond what that one trial tested.

Does saw palmetto help hair growth in women?

The 2025-2026 trial included women (half of the 60 participants) and found a significant benefit in the menopausal-women subgroup specifically. That's a meaningful update — most saw palmetto research has studied only men — but it's still one trial. See what does saw palmetto do for women for the fuller picture.

Can saw palmetto reverse hair loss, or just slow it?

The trial measured hair counts and density going up compared with placebo, not just loss slowing down — but it ran 180 days, not longer, so there's no data on whether that trend continues, plateaus, or reverses if someone stops taking it.

Is saw palmetto a DHT blocker for hair?

A laboratory study found one specific extract blocked the enzyme that converts testosterone to DHT in cells in a dish — a proposed mechanism, not a measurement of DHT or hair growth in a person. The hair trial above didn't measure DHT levels, so it doesn't confirm that mechanism explains its result.

When to talk to a doctor

Saw palmetto is not a substitute for a medical evaluation of hair loss. Sudden, patchy, or rapidly progressing hair loss can have causes unrelated to androgenetic alopecia — thyroid issues, iron deficiency, and other conditions among them — and are worth a doctor's evaluation rather than a supplement trial-and-error approach. If you're pregnant, nursing, or on medication, see who should not take saw palmetto before adding it.

Related reading: saw palmetto benefits: what the research does and doesn't show, does saw palmetto raise or lower testosterone, and how to choose a good saw palmetto supplement.