White peony root (Paeonia lactiflora, known in Chinese medicine as Bai Shao) is one of the most-used herbs in Traditional Chinese Medicine (TCM). Unlike most of its relatives, it has solid human evidence behind one specific extract, used for one condition. This guide separates that real evidence from the wider folk claims, and covers forms, dosage, and safety.
What is white peony?
White peony root comes from Paeonia lactiflora, scraped, boiled, and dried before use. It is different from red peony (Chi Shao), which TCM uses for "blood-moving" and "heat-clearing" rather than the nourishing, relaxing role of white peony. It is also a different species from European peony (Paeonia officinalis); see our separate peony overview.
Its main studied compound is paeoniflorin, alongside albiflorin, paeonol, and related glycosides. A standardised extract called total glucosides of peony (TGP), made mostly from this root, is where the strongest evidence lies.
What the research actually shows
The honest picture is that one preparation has real human trials, while most other uses rest on animal data or tradition.
Rheumatoid arthritis: the strongest evidence
TGP is not a typical supplement. It is a standardised extract that China's drug regulator approved as a medicine for rheumatoid arthritis in 1998, and its benefit there has been tested in controlled human trials (He & Dai, 2011). A later review pooled 8 trials with 522 patients. It found TGP added to the usual drug, methotrexate, worked better than that drug alone, with fewer side effects, though trial quality was only moderate to low (Zhang et al., 2017). That result applies to the TGP drug, not to a home tea or a generic capsule.
Anti-inflammatory and other effects: mostly preclinical
Paeoniflorin calms inflammation, eases pain, and protects tissue in many lab studies. A 2021 review of how it works is clear that this is "pre-clinical" work, from cell and animal models, and calls for proper human trials to confirm any benefit (Jiao et al., 2021). So the broad anti-inflammatory reputation has a believable mechanism but little human proof.
Menstrual and "liver" uses: traditional and formula-based
White peony is best known traditionally for period pain, cramps, and TCM "liver" patterns. It is almost always used inside multi-herb formulas, not alone. There is no strong trial of the single herb for these uses, so they stay traditional uses, not proven treatments. Europe's herbal medicines committee reviewed white peony but did not issue an approved EU monograph for it (EMA, Paeoniae radix alba). Cramp bark is the Western herb traditionally aimed at the same kind of cramping β see our cramp bark guide for how it compares.
Traditional indications and their evidence status
| Traditional use | Proposed mechanism | Human evidence |
|---|---|---|
| Rheumatoid arthritis (as TGP) | Immune regulation | Randomised trials (TGP drug) |
| Menstrual cramps, period pain | Antispasmodic, smooth-muscle relaxation | Traditional / formula-based only |
| Abdominal pain and tension | Paeoniflorin smooth-muscle effects | Animal and cell studies |
| "Liver" patterns, general inflammation | Anti-inflammatory | Mostly preclinical |
Dosage and preparation
White peony is almost always used within a formula, not on its own.
- Decoction: roughly 6β15 g of dried root per day inside a formula, sometimes higher under practitioner supervision.
- TGP products: these follow their own standardised dosing and are a different category from raw-herb teas or capsules; follow the product or prescriber instructions.
Processed forms
- Raw (sheng bai shao): considered cooling; used for "heat" patterns and menstrual issues.
- Stir-fried (chao bai shao): gentler on digestion, preferred for weak digestion.
- Vinegar-processed (cu bai shao): traditionally directed at "liver" patterns such as flank pain and cramping.
- Wine-processed (jiu bai shao): used in "blood-nourishing" contexts.
Most supplements use raw or stir-fried root; check the label for the processing type.
Side effects and safety
White peony is generally well tolerated at usual doses, with adverse effects uncommon. Still:
- Digestive upset: loose stools or mild nausea are the most reported effects, more so with raw forms or on an empty stomach. Mild diarrhoea was the main side effect seen in the rheumatoid arthritis trials.
- Pregnancy: avoid it without qualified clinical guidance, as peony may affect the uterus at higher doses.
- Blood thinners: paeoniflorin may have mild antiplatelet activity, so check with your prescriber before combining with anticoagulant or antiplatelet drugs.
- Immune-suppressing drugs: because TGP changes immune activity, do not combine it with these drugs without medical supervision.
- Serious conditions: do not use white peony in place of treatment for arthritis or any diagnosed illness, and check for interactions if you take prescription medicines.
For background on using herbs and TCM safely, see NCCIH.
For related roots used in the same formulas, see our guides to rehmannia and bupleurum.
Frequently Asked Questions
What is white peony best supported for? Its strongest human evidence is for rheumatoid arthritis, but only as the TGP extract added to standard care. Its traditional menstrual and "liver" uses are not backed by good single-herb trials.
Is white peony the same as TGP? No. TGP (total glucosides of peony) is a standardised, drug-grade extract made mostly from this root. A raw-herb tea or generic capsule is not the same product and has not been tested the same way.
Can I use white peony for period pain? It is a traditional ingredient in TCM formulas for menstrual cramps, but there is no strong single-herb trial proving it works. Severe or worsening period pain should be assessed by a clinician.
Can white peony be combined with rehmannia? Yes, they are paired in many classic formulas. The right ratio and indication should be set by a qualified practitioner for your situation.
Medical disclaimer: This article is for informational purposes only. Always consult a qualified healthcare provider before making changes to your health routine.
Sources
- He DY, Dai SM. Anti-inflammatory and immunomodulatory effects of Paeonia lactiflora Pall., a traditional Chinese herbal medicine. Frontiers in Pharmacology, 2011;2:10 (PMID 21687505) β PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC3108611/
- Zhang W, et al. A systematic review and meta-analysis of the clinical efficacy and safety of total glucosides of peony combined with methotrexate in rheumatoid arthritis. Clinical Rheumatology, 2017 β PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC5754451/
- Jiao F, et al. Recent Insights into the Protective Mechanisms of Paeoniflorin in Neurological, Cardiovascular, and Renal Diseases. Journal of Cardiovascular Pharmacology, 2021 β PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC8169546/
- European Medicines Agency (EMA). Paeonia lactiflora Pallas, radix (Paeoniae radix alba) β assessment (no EU herbal monograph adopted). https://www.ema.europa.eu/en/medicines/herbal/paeoniae-radix-alba
- National Center for Complementary and Integrative Health (NCCIH). Traditional Chinese Medicine: What You Need To Know. https://www.nccih.nih.gov/health/traditional-chinese-medicine-what-you-need-to-know
All sources accessed 29 May 2026.
