Saw Palmetto

Saw Palmetto has real, repeated clinical evidence for hair density — but almost all of it is for oral supplements, not the topical extract in a shampoo. Here’s that distinction, stated plainly.

Description

What is it?

Saw Palmetto (Serenoa repens, also listed as Serenoa serrulata) is a plant extract long studied for its role in blocking DHT (dihydrotestosterone), a hormone linked to pattern hair thinning. It’s used both as an oral supplement and, increasingly, as a topical ingredient in hair-care formulas.

What does it actually do?

Oral saw palmetto significantly improves hair density in a controlled trial. According to PubMed, a 6-month, randomized, double-blind, placebo-controlled study (Ablon G. “The Safety and Efficacy of a Novel Saw Palmetto (Serenoa repens) Extract for Promoting Hair Growth in Adults With Self-Perceived Thinning Hair: 180-Day Results.” Journal of Cosmetic Dermatology, 2026) found that a daily oral saw palmetto supplement significantly increased total hair count, vellus hair count and hair density compared with placebo, in both men and menopausal women. (DOI)
Confirmed across multiple studies in a network meta-analysis. According to PubMed, a systematic review and network meta-analysis of dietary supplements for androgenetic alopecia (Zhou L, Zhu W, Chen Y. “Effects of dietary supplements on androgenetic alopecia: a systematic review and network meta-analysis.” Frontiers in Nutrition, 2026) found saw palmetto extract among the supplements showing higher hair-regeneration scores than placebo. (DOI)
Boosts the effectiveness of standard hair-fall treatments when taken orally alongside them. According to PubMed, a multicenter randomized trial in 225 patients (Milani M, Alfano S. “Impact of a Novel Dietary Supplement on Efficacy of Pharmacological Treatments for Androgenic Alopecia.” Journal of Cosmetic Dermatology, 2025) found an oral saw palmetto-containing supplement significantly increased the clinical efficacy of standard treatments (minoxidil/finasteride) compared with drug treatment alone. (DOI)

(Note: all three studies tested ORAL saw palmetto supplementation — a capsule taken daily — not the topical, rinse-off form used in a shampoo. Mystic Dust’s topical saw palmetto extract is included for its general antioxidant and scalp-conditioning profile, not as a claim that it replicates the hair-density results seen with oral supplementation.)

Who is it good for?

Hair thinning and hair fall concerns, as part of a broader routine — the strongest, most consistent hair-density evidence currently available is for oral use, not topical alone.

No real precautions for topical use.

How Mystic Dust uses it

Scalp Strength Hair Growth Shampoo.

Pairs well with

Caffeine, Anagain, Redensyl — other hair-fall-focused actives in the same upcoming formula.

Use with caution alongside

Nothing specific for topical use.

Research & Findings

According to PubMed: -

Ablon G. “The Safety and Efficacy of a Novel Saw Palmetto (Serenoa repens) Extract for Promoting Hair Growth in Adults With Self-Perceived Thinning Hair: 180-Day Results.” Journal of Cosmetic Dermatology, 2026;25(2):e70717. DOI

Zhou L, Zhu W, Chen Y. “Effects of dietary supplements on androgenetic alopecia: a systematic review and network meta-analysis.” Frontiers in Nutrition, 2026;12:1719711. DOI

Milani M, Alfano S. “Impact of a Novel Dietary Supplement on Efficacy of Pharmacological Treatments for Androgenic Alopecia: A Real-Life, Multicenter, Randomized, Assessor-Blinded Trial on 225 Subjects.” Journal of Cosmetic Dermatology, 2025;24(9):e70388. DOI