Saw Palmetto Benefits for Hair: How It Works & the Dose Studies Used


What the research says about saw palmetto for hair — and the dose the studies actually used.

Updated October 4, 2026 · 3 min read
Palm leaf with berries
Saw palmetto benefits

Saw palmetto is one of the best-selling herbal supplements in the US. It's taken for two main reasons: hair and the prostate. Here's what it can do for your hair.

What is saw palmetto?

Dark palm berries

Saw palmetto (Serenoa repens) is a small fan palm native to the southeastern United States. Its dark berries are turned into an oil-rich extract, usually taken at 320 mg a day.

Hair: the DHT connection

Pattern hair thinning is driven largely by DHT, a hormone made from testosterone by the enzyme 5-alpha reductase. Saw palmetto has been studied for slowing that enzyme.

TTestosterone

5α5-alpha reductase enzymeSaw palmetto slows this step

DHTDHT

Follicles can shrink over time
34.5%higher hair count with 100 mg tocotrienols in an 8-month placebo-controlled study
27%average increase in total hair count across oral studies in a 2020 review
320 mgthe daily dose used in most saw palmetto hair studies

Buying a saw palmetto supplement: what to look for

Skip it if…

  • The dose isn't listed
  • It's hidden in a proprietary blend
  • It's in a sugary gummy
  • It's paired with mega-dose biotin

Look for…

  • 320 mg on the label
  • Every dose disclosed
  • A capsule
  • Nutrients that support hair from other angles

Why saw palmetto works better as part of a formula

Saw palmetto works on one pathway. Hair also needs building blocks and nutrients:

Palm fruit
100 mg Mixed TocotrienolsThe dose used in a placebo-controlled hair study (+34.5% hair count).
Eggs
250 mg L-CystineAn amino acid building block of keratin, the protein hair is made of.
Nuts
Zinc + CopperZinc contributes to the maintenance of normal hair — paired with copper for balance.
Sunlight
2,000 IU Vitamin D3Low vitamin D has been linked to hair shedding in observational studies.
320 mg saw palmetto + 10 more Denra Daily Density

Denra Daily Density

Daily Density pairs the 320 mg saw palmetto dose used in research with tocotrienols, L-cystine, zinc + copper and vitamin D3 — every dose on the label, no biotin.

  • 320 mg saw palmetto — the dose used in most studies, printed on the label
  • Plus 100 mg tocotrienols, 250 mg L-cystine, zinc + copper and vitamin D3
  • No biotin, no ashwagandha, no sugar, no proprietary blend
  • Just 2 capsules a day · third-party tested
  • Give it at least 3 months — hair grows in slow cycles
320 mgSaw palmetto extract
250 mgL-Cystine
100 mgMixed tocotrienols
2,000 IUVitamin D3
15 mgZinc bisglycinate
1.5 mgCopper bisglycinate
55 mcgSelenium
90 mgVitamin C
90 mcgVitamin K2 (MK-7)
50 mcg + 2 mgVitamin B12 + B6
Check Availability →
30-day supply · 2 capsules daily · Third-party tested

Quick questions

Can women take saw palmetto?

Yes, many women take it for hair. Because it may influence hormones, it is not recommended during pregnancy, while breastfeeding or when trying to conceive. Ask your doctor if you're unsure.

How long does it take?

Plan on at least 3 months of daily use before judging results. Hair grows slowly and in cycles, and the studies ran for months.

Are there side effects?

Saw palmetto is generally well tolerated in studies. Mild stomach upset and headache have been reported. If you take medication — especially hormonal medication or blood thinners — talk to your doctor first.

Does Daily Density contain biotin?

No. Daily Density is biotin-free by design — so there's no mega-dose biotin to flag before lab tests.