For over a thousand years, traditional Chinese medicine practitioners have prescribed Polygonum multiflorum — known by its Chinese name He Shou Wu — for a condition they described as "blackening hair and nourishing essence." Ancient texts from the Tang Dynasty onward consistently documented its effects on hair quality, thickness, and growth. For most of that millennium, Western science viewed those claims skeptically, if it considered them at all.
That skepticism is now being systematically dismantled. A major new scientific review published in the Journal of Holistic Integrative Pharmacy in June 2026 synthesizes the full body of laboratory and clinical research on Polygonum multiflorum's effects on hair biology — and concludes that the herb doesn't just work, it works through four distinct biological pathways simultaneously, addressing hair loss in ways that no single existing pharmaceutical does.
"Our analysis bridges ancient wisdom and modern science," said Bixian Han, the review's first author. "What surprised us was how consistently historical texts from the Tang Dynasty onward described effects that align perfectly with today's understanding of hair biology. Modern studies now confirm that this isn't folklore; it's pharmacology."
Four Mechanisms, One Root
Most standard hair loss treatments act on a single biological pathway. Finasteride blocks the conversion of testosterone to DHT. Minoxidil increases blood flow to the scalp. The narrowness of these mechanisms limits their effectiveness and creates the clinical reality that neither works for everyone.
Polygonum multiflorum appears to act differently. According to the review, the herb influences hair biology through four reinforcing mechanisms working simultaneously.
First, it reduces the impact of dihydrotestosterone (DHT) — the hormone responsible for follicle miniaturization in androgenetic alopecia, the most common form of hair loss in men and women. In androgenetic alopecia, DHT progressively shrinks hair follicles over the years, producing the characteristic thinning that eventually leads to baldness. Polygonum multiflorum extracts have been shown in laboratory studies to inhibit the cellular pathways through which DHT causes follicle damage.
Second, it activates key regenerative signaling pathways — specifically Wnt/β-catenin and Sonic Hedgehog (Shh) — that control the hair follicle cycle and maintain follicle stem cell activity. When these signals are active, dormant follicles are stimulated to re-enter the growth phase. In animal models, topical Polygonum multiflorum extracts triggered dormant follicles to resume activity while increasing the protein expression of both β-catenin and Shh in scalp tissue.
Third, it prevents premature apoptosis — programmed cell death — in hair follicle cells. Healthy hair follicles require living, active cells to sustain the growth cycle. Polygonum multiflorum extracts help protect these cells from dying too early, extending the productive lifespan of individual follicles.
Fourth, it improves blood circulation in the scalp, enhancing oxygen and nutrient delivery to follicles during their growth phase — addressing one of the physiological contributors to follicle decline in aging scalps.
The Safety Question — and the Processed vs. Raw Distinction
It is important to note that Polygonum multiflorum also carries a well-documented risk of hepatotoxicity — liver toxicity — when taken in raw, unprocessed form or in excessive doses. Processed Polygonum multiflorum (known as Zhì hé shǒu wū) undergoes a traditional preparation method that substantially reduces hepatotoxic compounds and is considered significantly safer. The scientific literature distinguishes clearly between raw and processed forms.
Anyone considering Polygonum multiflorum supplements should consult a physician or licensed traditional Chinese medicine practitioner, ensure they are using a processed formulation from a reputable source with third-party testing, and avoid high doses or prolonged unmonitored use. The FDA currently classifies it as a dietary supplement, not a pharmaceutical, and does not regulate its potency or composition.
Frequently Asked Questions
Q: What is Polygonum multiflorum / He Shou Wu?
A: A traditional Chinese medicinal root used for over 1,000 years for hair health. Modern science confirms it acts on four biological mechanisms simultaneously: DHT reduction, follicle regeneration signaling, anti-apoptosis in follicle cells, and improved scalp circulation.
Q: Is it better than finasteride or minoxidil?
A: It has not been directly compared to finasteride or minoxidil in large head-to-head randomized trials. Its multi-target mechanism is scientifically distinctive, but it is not FDA-approved for hair loss and the evidence base is not as large as for approved drugs.
Q: Is Polygonum multiflorum safe to take?
A: Raw, unprocessed forms carry a risk of liver toxicity. Processed formulations are considered substantially safer. Always consult a physician before use and use only processed, third-party-tested products.
Q: Where is this research published?
A: The 2026 comprehensive review is published in the Journal of Holistic Integrative Pharmacy. Earlier foundational research is published in peer-reviewed journals including those indexed by PubMed.
