Ingredient Guide
Fo-Ti (He Shou Wu): Benefits, Dosage, and What the Research Says
The Ancient Chinese Longevity Root - Separating Proven Science from Traditional Claims
Written by Jessica Medson
Fo-Ti (He Shou Wu, Polygonum multiflorum) is a Traditional Chinese Medicine root used for over 1,000 years to support hair health, longevity, and lipid balance. Laboratory studies suggest its primary bioactive - the stilbene glycoside TSG - and anthraquinone compounds may promote hair follicle growth, modulate cholesterol-related enzymes, and protect neurons in preclinical models, but well-designed human clinical trials confirming these benefits have not been published. Critically, Fo-Ti is the leading herbal cause of drug-induced liver injury in China, with documented fatal cases, and must be used with serious caution or avoided in those with liver conditions, susceptible genetic profiles, or hepatotoxic medication regimens.
What Is Fo-Ti (He Shou Wu)?
Polygonum multiflorum Thunb. (synonym: Reynoutria multiflora), marketed in North America as Fo-Ti and known in China as He Shou Wu (何首乌, literally "black-haired Mr. He"), is a perennial climbing vine native to central and southern China, Taiwan, and Japan. Its thick, starchy tuberous root has been a cornerstone of Traditional Chinese Medicine (TCM) for more than 1,000 years, prized as a longevity tonic and used for conditions ranging from hair graying to constipation to general vitality support.2
The Chinese Pharmacopoeia distinguishes two clinically important preparations, and this distinction has direct safety and efficacy implications:1
- Raw (unprocessed) root (Sheng He Shou Wu): Retains high levels of anthraquinone compounds. Traditionally used as a laxative and applied externally. Carries a significantly higher liver-injury risk and is generally not appropriate for internal tonic use.
- Processed root (Zhi He Shou Wu): Steam-cured with black soybean juice, which substantially reduces but does not eliminate anthraquinone content. This is the form used in classical tonic formulas and in modern commercial extracts marketed for hair and longevity support. Still carries residual liver-injury risk.
When evaluating any Fo-Ti supplement, confirm whether the product uses processed or unprocessed root. A reputable supplier will specify this on the label or certificate of analysis. Products that do not disclose the preparation type should be approached with extra caution.
How Does It Work? Key Bioactive Compounds
Researchers have catalogued over 100 chemical compounds in P. multiflorum root, organized into three major pharmacologically active classes.2 Understanding which compounds do what helps explain both the herb's potential benefits and its documented risks.
- Stilbene glycosides - primarily 2,3,5,4’-tetrahydroxystilbene-2-O-β-D-glucoside (TSG), the most studied isolated bioactive. TSG demonstrates antioxidant, anti-inflammatory, lipid-modulating, and preliminary hair-regrowth activity across multiple preclinical model systems.7
- Anthraquinones - including emodin, rhein, and chrysophanol. These contribute laxative and antimicrobial properties, inhibit HMG-CoA reductase (a cholesterol-synthesis enzyme), and - critically - are the primary compounds associated with liver injury through oxidative stress, mitochondrial dysfunction, and bile acid disruption.12
- Flavonoids, tannins, and other polyphenols - contribute to the herb's broader antioxidant capacity and may modulate inflammatory pathways; these are less well characterized than TSG and the anthraquinones.2
Processing (steaming with black soybean) reduces anthraquinone concentrations substantially, which is one reason processed root is the form recommended for tonic use. Even so, anthraquinone content is not eliminated, and the immune-mediated mechanism of liver injury (see Safety section) means that even typical supplement doses can trigger serious reactions in genetically susceptible individuals.11
Fo-Ti and Hair Health: What Does the Research Show?
Fo-Ti's most celebrated traditional application is supporting hair growth and maintaining natural hair color. Modern laboratory research has begun mapping plausible mechanisms, though controlled human clinical trials are absent, and current evidence is predominantly preclinical.1
What the research shows
Human-derived cell models: A 2020 study using cultured human dermal papilla cells (DPCs) and human hair follicle organ cultures found that PM extract at concentrations of 20-50 µg/ml extended the anagen (active growth) phase to between 78.9% and 100% of follicles tested.3 The extract also increased the anti-apoptotic protein Bcl2, reduced pro-apoptotic BAD expression, and decreased DHT-induced androgen receptor expression by approximately 40% in a dose-dependent fashion. Growth factors including IGFBP2, PDGF, VEGF, and EGF were upregulated, collectively suggesting a more supportive environment for follicle function. This study used human-derived cells, which is more relevant than purely animal data, but it is still an in vitro model - not a clinical trial.
Animal models - hair growth: A 2011 mouse study found that topically applied PM extract induced follicle transition from the resting (telogen) phase to active growth (anagen) by upregulating sonic hedgehog (Shh) and β-catenin signaling, two molecular switches critical for follicle cycling and regeneration.4
Animal models - hair color: Preclinical research in mice with hydrogen peroxide-induced hair fading found that raw Fo-Ti root produced the highest total melanin content and elevated levels of α-MSH, MC1R, and tyrosinase (TYR) - the principal molecular targets governing melanocyte activity and hair pigmentation.5 Importantly, processed root was less effective than raw root for pigmentation in this model, and isolated TSG alone was weaker still, suggesting that synergistic action among multiple compounds may drive the pigmentation effect.
TSG (isolated compound): A 2025 systematic review of TSG's anti-aging effects reported that depilated mice treated with TSG demonstrated marked hair regrowth via inhibition of apoptotic factors in hair follicle cells.7
What this means in practice: The human-cell data from study 3 are encouraging and mechanistically plausible, but a laboratory dish is not a scalp. None of these studies are oral supplementation trials in living humans. Well-designed randomized controlled trials are needed before efficacy claims can be made with confidence. Preclinical research is ongoing, and this remains one of the more active areas of Fo-Ti investigation.
Fo-Ti and Lipid Metabolism: Preclinical Insights
Several of Fo-Ti's bioactive compounds interact directly with enzymes governing cholesterol and triglyceride metabolism, making lipid support one of the herb's more mechanistically grounded areas of research - though all published evidence is currently in vitro or from TCM clinical observations rather than rigorous Western-standard RCTs.6
What the research shows
A laboratory study systematically examined how the three principal bioactives in Fo-Ti root affect lipid-metabolizing enzymes:6
- TSG showed the strongest LDL-reducing activity, primarily by upregulating CYP7A (cholesterol 7α-hydroxylase), the enzyme that converts cholesterol into bile acids for elimination. TSG "displayed the most important role in the total cholesterol lowering effect" among all tested components.
- Emodin inhibited both HMG-CoA reductase - the rate-limiting enzyme in cholesterol biosynthesis, the same target as prescription statin medications - and DGAT1, a key enzyme in triglyceride synthesis. This reduced both total cholesterol and triglyceride production in cell models.
- Physcion increased hepatic triglyceride lipase (HTGL) activity, promoting VLDL clearance from the circulation and producing the strongest VLDL-lowering effect of the three.
A comprehensive clinical review that surveyed Chinese clinical literature noted TCM practitioners have used PM preparations to support lipid balance, and characterized the compound's effects as working synergistically through multiple distinct enzymatic pathways.1
Evidence grade - Tier C (preclinical only): No rigorous, placebo-controlled human trials examining the effect of standardized Fo-Ti supplementation on measurable blood lipid parameters have been published in indexed literature. These in vitro findings are mechanistically interesting and provide rationale for further investigation, but they do not establish clinical benefit. Do not discontinue or reduce any prescribed lipid-lowering medication on the basis of herbal supplement claims.
Fo-Ti and Healthy Aging: What Preclinical Research Suggests
In TCM, He Shou Wu is classified as a kidney-liver tonic and a premier longevity herb. Contemporary preclinical science has begun characterizing molecular mechanisms that may relate to brain health, cardiovascular aging, and biological longevity - though the evidence base remains entirely preclinical and human trial data are absent.8
What the research shows
Neuroprotection and cognitive aging: A 2024 systematic review of preclinical studies found that P. multiflorum and its bioactives - particularly stilbene glycosides and emodin - influenced cognitive outcomes in animal models of Alzheimer's disease through multiple mechanisms: reducing oxidative and mitochondrial damage, modulating neuroinflammation, halting apoptosis, and promoting neurogenesis and synaptogenesis.8 The authors explicitly noted that human evidence is not yet established and these data "can serve as a basis for future clinical trials."
TSG's multi-system anti-aging activity: A 2025 systematic review focused specifically on TSG compiled evidence showing lifespan extension of approximately 16.48% in C. elegans (a well-validated aging model), neuroprotection against Alzheimer's and Parkinson's disease animal models, cardiovascular benefits including reduced vascular senescence and atherosclerosis, and protective effects on bone density and reproductive aging.7 Proposed mechanisms include antioxidant signaling, anti-inflammatory pathways, mitochondrial support, and telomerase activation.
Evidence grade - Tier C (preclinical only): No human RCTs have examined cognitive outcomes, cardiovascular aging endpoints, or longevity parameters with Fo-Ti or isolated TSG. Animal lifespan extension data, while scientifically interesting, do not translate predictably to human benefit. Advertising claims that Fo-Ti "reverses" cognitive decline or extends human lifespan are not supported by available evidence and exceed what current science can establish.
Safety, Side Effects & Interactions
Fo-Ti (He Shou Wu) is associated with documented cases of serious, occasionally fatal drug-induced liver injury (DILI). Stop taking Fo-Ti immediately and seek medical evaluation if you develop jaundice (yellowing of skin or eyes), dark or tea-colored urine, pale stools, right-upper-abdomen pain, or unexplained severe fatigue. Do not restart the herb after any of these symptoms. If you have a liver condition or take medications that affect the liver, consult your physician before considering Fo-Ti.
Documented liver injury risk
Fo-Ti is widely recognized as the most common herbal cause of drug-induced liver injury in China, with significant case reports from Korea, Japan, Europe, and North America as well.13 A 2011 Korean case series documented 25 patients who developed acute hepatitis after consuming PM preparations. Of those patients, 92% recovered with conservative management, 1 required liver transplantation, and 1 died from hepatic failure.9 A 2019 comprehensive clinical review noted that China's National Adverse Reaction Monitoring network had received over 10,000 complaints related to PM preparations.10
Key features of PM-induced liver injury based on published clinical data include:13
- Onset typically ranges from days to 6 months after starting the herb
- Hepatocellular or mixed (hepatocellular + cholestatic) injury pattern on laboratory testing
- Clinical presentation often resembles acute viral hepatitis: fatigue, nausea, vomiting, jaundice, dark urine
- Up to 10% of documented cases have been fatal or required urgent liver transplantation
- Rapid and more severe recurrence on re-exposure - rechallenge must be strictly avoided13
Genetic risk factor: HLA-B*35:01
Research has identified a strong genetic susceptibility factor. The HLA allele B*35:01 is found in 70-88% of documented PM-DILI cases in Chinese populations compared with approximately 5% of unaffected controls.11 This indicates that PM-induced liver injury is primarily an idiosyncratic, immune-mediated reaction rather than a dose-dependent toxic effect - meaning that standard or even low doses can trigger serious liver injury in genetically susceptible individuals regardless of preparation type or dose. Routine clinical testing for HLA-B*35:01 is not widely available, so risk cannot be reliably screened out in advance.
Who should avoid Fo-Ti entirely
- Pregnant or breastfeeding individuals: Safety is not established. Animal data suggest anthraquinone constituents carry embryotoxic risk; avoid use.2
- Anyone with existing liver disease: Any form of hepatic impairment - including fatty liver disease, viral hepatitis, cirrhosis, or elevated liver enzymes of unknown cause - is a contraindication.
- Children: Avoid; pediatric liver injury cases have been documented, including in a child as young as 5 years old.13
- Individuals on hepatotoxic medications: Concurrent use with statins, azole antifungals, isoniazid, NSAIDs at high doses, acetaminophen, or with regular alcohol intake further elevates liver injury risk.
Drug and supplement interactions
- Anticoagulants (warfarin, heparin): Anthraquinones may affect coagulation pathways; concurrent use should be monitored closely by a prescribing physician.
- Laxatives: Raw or inadequately processed root has potent laxative effects; combining with other laxatives risks electrolyte imbalances including hypokalemia.
- CYP450-metabolized drugs: PM extracts may inhibit CYP1A2 and CYP2E1 enzyme activity, potentially raising blood levels of affected medications.12
- Immunosuppressants: Given the immune-mediated mechanism of DILI, theoretical interactions with immunosuppressive agents exist.
Always inform your physician and pharmacist if you are taking or considering Fo-Ti supplementation, particularly if you have any chronic condition, take prescription medications, or have a personal or family history of liver disease.
Fo-Ti (He Shou Wu) Dosage Reference
No consensus human clinical dose has been established from randomized controlled trials. The ranges below reflect traditional Chinese Pharmacopoeia guidance and doses observed in Chinese clinical practice. Use the lowest effective dose for the shortest necessary duration, and only with physician awareness.
| Goal | Typical Dose | Timing | Notes |
|---|---|---|---|
| Traditional oral tonic (processed root, whole herb) | 9-15 g dried processed root per day | Divided into 2-3 doses, taken with meals | Chinese Pharmacopoeia guidance; processed (Zhi He Shou Wu) only; not for raw root |
| Standardized extract (commercial capsules or tablets) | 500-1,500 mg per day | With food, typically once or twice daily | Look for standardized TSG content and verified low anthraquinone levels; confirm processed root source |
| Short-term use as observed in Chinese clinical reports | 6-12 g crude root equivalent per day | Morning and evening with food | Duration in reported clinical use: 4-12 weeks; long-term safety data beyond 12 weeks are lacking |
| Topical hair application (experimental) | Not established; concentration-dependent in cell models (20-50 mcg/ml in vitro) | N/A - clinical topical dosing not established in humans | In vitro data only; no standardized topical product or dosing regimen validated in clinical trials |
These doses are informational only and are not a medical recommendation. Due to the serious risk of drug-induced liver injury, Fo-Ti should only be taken after consultation with a qualified healthcare provider.
What the Evidence Shows at a Glance
A transparent summary of Fo-Ti's studied effects and the current strength of evidence for each outcome.
| Use / Outcome | What Studies Show | Evidence Tier | Human RCT Available? |
|---|---|---|---|
| Hair growth support | Human dermal papilla cells show anagen extension (78.9-100%) and DHT-receptor reduction (~40%); mice models show follicle activation via Shh/beta-catenin upregulation | Tier C (in vitro + animal) | No - cell culture and animal data only |
| Hair color / graying support | Mouse models: raw PM root increased melanin content and elevated alpha-MSH, MC1R, tyrosinase; processed root and isolated TSG less effective | Tier C (animal only) | No |
| Lipid / cholesterol support | In vitro: TSG upregulates CYP7A (LDL reduction); emodin inhibits HMG-CoA reductase and DGAT1; physcion boosts VLDL clearance | Tier C (in vitro only) | No published RCTs |
| Neuroprotection / cognitive aging | Animal and cell models: reduces neuroinflammation, oxidative stress, apoptosis; TSG extends C. elegans lifespan ~16.48% | Tier C (preclinical only) | No |
| Drug-induced liver injury (safety risk) | 25+ case series documenting hepatocellular DILI; up to 10% fatal or requiring transplant; HLA-B*35:01 in 70-88% of cases | Tier B (human case series + epidemiology) | Yes - case series, pharmacoepidemiology, genetic studies |
Tier A = human RCT or meta-analysis. Tier B = human observational study or case series. Tier C = animal or cell-based data only. Preclinical findings do not reliably predict human outcomes.
Frequently Asked Questions
What is Fo-Ti (He Shou Wu) good for?
Fo-Ti is most commonly used to support hair growth, hair color maintenance, and general longevity in the tradition of Chinese medicine. Preclinical studies suggest it may also support lipid metabolism and neuroprotection. However, no human randomized controlled trials confirm any of these benefits. The strongest evidence is for its risk: serious drug-induced liver injury.
Does Fo-Ti (He Shou Wu) help with hair loss?
Preclinical data are encouraging. A 2020 human cell-culture study found PM extract extended the hair follicle growth phase by up to 100% and reduced androgen receptor expression by approximately 40% in human dermal papilla cells. Animal studies show follicle activation and melanin support. Human clinical trial evidence is absent, so benefit in living people has not been confirmed.
How much Fo-Ti (He Shou Wu) should I take per day?
Traditional Chinese Pharmacopoeia guidance for processed root is 9-15 g of dried root per day, typically divided into two to three doses with meals. Commercial standardized extracts generally fall in the 500-1,500 mg per day range. No human RCT has established an optimal dose. Always confirm the product uses processed (Zhi He Shou Wu) root and consult a healthcare provider before starting.
Is Fo-Ti (He Shou Wu) safe to take?
Fo-Ti carries a serious, documented liver injury risk and is not safe for everyone. It is the leading herbal cause of drug-induced liver injury in China. Most healthy users with no susceptible genetic profile (HLA-B*35:01) do not experience problems, but the reaction is unpredictable. People with liver conditions, those who are pregnant, children, and anyone on hepatotoxic medications should avoid it entirely.
Can Fo-Ti (He Shou Wu) cause liver damage?
Yes - this is well documented in peer-reviewed literature. A 2011 case series of 25 patients found 1 death and 1 liver transplant needed. A 2019 clinical review cited over 10,000 adverse-event reports in China alone. Injury typically presents as acute hepatitis with jaundice and dark urine. Stop use immediately and seek medical care if any of these symptoms appear.
What is the difference between raw and processed Fo-Ti (He Shou Wu)?
Raw (Sheng He Shou Wu) retains high levels of anthraquinones and is primarily used as a laxative; it carries a significantly higher liver-injury risk. Processed (Zhi He Shou Wu) is steam-cured with black soybean juice, substantially reducing anthraquinone content. Tonic and hair-support applications use processed root. Confirm which form your supplement contains before purchasing.
Does Fo-Ti (He Shou Wu) really reverse gray hair?
The evidence is limited to animal models. A 2015 mouse study found raw Fo-Ti preparations increased melanin and pigmentation enzyme levels in hydrogen peroxide-induced hair fading. No human trials have demonstrated measurable reversal of gray hair. Interestingly, the processed form used in supplements was less effective than raw root for pigmentation in animal models, further limiting translation to commercial products.
What are the side effects of Fo-Ti (He Shou Wu)?
The most serious documented side effect is drug-induced liver injury, which can be severe or fatal. Other reported effects include nausea, abdominal pain, diarrhea, and - at high doses of unprocessed root - electrolyte disturbances. Rash and allergic reactions are also reported. The immune-mediated mechanism means side effects may be unpredictable and not dose-dependent.
Can I take Fo-Ti (He Shou Wu) with cholesterol medications?
Caution is warranted. Fo-Ti components (particularly emodin) inhibit HMG-CoA reductase - the same target as statin drugs - raising theoretical additive effects. More importantly, combining Fo-Ti with statins or other hepatotoxic medications increases liver injury risk. Always inform your prescribing physician before adding any herbal supplement to a statin regimen.
Who should not take Fo-Ti (He Shou Wu)?
Avoid Fo-Ti if you are pregnant or breastfeeding, have any liver disease (including fatty liver, hepatitis, or elevated liver enzymes), are a child, drink alcohol regularly, or take medications metabolized by CYP1A2 or CYP2E1, anticoagulants, other hepatotoxic drugs, or immunosuppressants. If in doubt, consult a physician before starting - the liver injury risk is real and documented.
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Scientific References
- 1.Bounda GA, Feng YU Review of clinical studies of Polygonum multiflorum Thunb. and its isolated bioactive compounds. Pharmacognosy Research. 2015. PubMed: 26130933Human observational
- 2.Lin L, Ni B, Lin H, Zhang M, Li X, Yin X, Qu C, Ni J Traditional usages, botany, phytochemistry, pharmacology and toxicology of Polygonum multiflorum Thunb.: a review. Journal of Ethnopharmacology. 2015. PubMed: 25449462Human observational
- 3.Shin JY, Choi YH, Kim J, Park SY, Nam YJ, Lee SY, Jeon JH, Jin MH, Lee S Polygonum multiflorum extract support hair growth by elongating anagen phase and abrogating the effect of androgen in cultured human dermal papilla cells. BMC Complementary Medicine and Therapies. 2020. PubMed: 32398000Preclinical (animal / cell)
- 4.Park HJ, Zhang N, Park DK Topical application of Polygonum multiflorum extract induces hair growth of resting hair follicles through upregulating Shh and beta-catenin expression in C57BL/6 mice. Journal of Ethnopharmacology. 2011. PubMed: 21419834Preclinical (animal / cell)
- 5.Han MN, Lu JM, Zhang GY, Yu J, Zhao RH Mechanistic Studies on the Use of Polygonum multiflorum for the Treatment of Hair Graying. BioMed Research International. 2015. PubMed: 26640791Preclinical (animal / cell)
- 6.Wang W, He Y, Lin P, Li Y, Sun R, Gu W, Yu J, Zhao R In vitro effects of active components of Polygonum Multiflorum Radix on enzymes involved in the lipid metabolism. Journal of Ethnopharmacology. 2014. PubMed: 24680992Preclinical (animal / cell)
- 7.Zhu C, Li J, Tang W, Li Y, Lin C, Peng D, Yang C 2,3,5,4'-Tetrahydroxystilbene-2-O-beta-D-glucoside (TSG) from Polygonum multiflorum Thunb.: A Systematic Review on Anti-Aging. International Journal of Molecular Sciences. 2025. PubMed: 40244282Preclinical (animal / cell)
- 8.Cha J, Yun JH, Choi JH, Lee JH, Choi BT, Shin HK Preclinical Evidence and Underlying Mechanisms of Polygonum multiflorum and Its Chemical Constituents Against Cognitive Impairments and Alzheimer's Disease. Journal of Pharmacopuncture. 2024. PubMed: 38948308Preclinical (animal / cell)
- 9.Jung KA, Min HJ, Yoo SS, Kim HJ, Choi SN, Ha CY, Kim HJ, Kim TH, Jung WT, Lee OJ, Lee JS, Shim SG Drug-Induced Liver Injury: Twenty Five Cases of Acute Hepatitis Following Ingestion of Polygonum multiflorum Thunb. Gut and Liver. 2011. PubMed: 22195249Human observational
- 10.Liu Y, Wang W, Sun M, Ma B, Pang L, Du Y, Dong X, Yin X, Ni J Polygonum multiflorum-Induced Liver Injury: Clinical Characteristics, Risk Factors, Material Basis, Action Mechanism and Current Challenges. Frontiers in Pharmacology. 2019. PubMed: 31920657Human observational
- 11.Rao T, Liu YT, Zeng XC, Li CP, Ou-Yang D The hepatotoxicity of Polygonum multiflorum: The emerging role of the immune-mediated liver injury. Acta Pharmacologica Sinica. 2021. PubMed: 32123300Human observational
- 12.Yu HS, Wang LL, He Y, Han LF, Ding H, Song XB, Gao XM, Yun NR, Li Z Advances in the Study of the Potential Hepatotoxic Components and Mechanism of Polygonum multiflorum. Evidence-Based Complementary and Alternative Medicine. 2020. PubMed: 33062019Human observational
- 13.National Institutes of Health, LiverTox Database Polygonum Multiflorum (He Shou Wu). LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. NCBI Bookshelf. 2023. PubMed: NBK548795Human observational