Dong Quai

What is Dong Quai?

Dong Quai is the dried root of Angelica sinensis, a plant in the Apiaceae family native to high-altitude regions of China, Japan, and Korea. It is one of the most widely used herbs in Traditional Chinese Medicine (TCM), often referred to as 'female ginseng' due to its extensive use in women's health formulas. In TCM, it is classified as a blood tonic that nourishes and invigorates blood and regulates the menstrual cycle.

How does Dong Quai work?

Dong Quai's primary bioactive compounds include Z-ligustilide, which has demonstrated smooth muscle relaxant and antispasmodic properties in preclinical models, potentially explaining its traditional use for menstrual cramping. Ferulic acid has antioxidant and anti-inflammatory activity and may modulate platelet aggregation. Critically, while Dong Quai contains phytoestrogen-like compounds, controlled human studies have not consistently demonstrated estrogenic effects on serum hormone levels, endometrial tissue, or menopausal symptom scores when used as a single-herb extract—suggesting its mechanisms in humans may differ substantially from in vitro findings.

What forms does Dong Quai come in?

Traditional TCM preparations involve decocting the whole dried root, often in combination formulas with other herbs. Modern Western supplements typically use standardized root powder or extract in capsule or tablet form. Liquid tinctures provide flexibility in dosing. Standardization varies widely across commercial products, and many Western clinical trials have studied Dong Quai as a single herb, whereas TCM traditionally uses it in multi-herb combinations where synergistic effects may differ.

Where it comes from:

Dong Quai has been documented in Chinese medical texts for at least 2,000 years and appears in the Shennong Bencao Jing (Divine Farmer's Materia Medica). It has been central to TCM gynecological formulas such as Si Wu Tang (Four Substance Decoction). Its introduction to Western herbal medicine occurred largely in the 20th century, where it was often marketed as a standalone phytoestrogenic supplement, a framing that diverges considerably from its traditional multi-herb use context.

What does Dong Quai help with?

• Dysmenorrhea (Menstrual Pain): Z-ligustilide, a key phthalide in Dong Quai, has shown smooth muscle relaxant and antispasmodic activity in preclinical studies, which may underlie the herb's traditional reputation for easing uterine cramping. Clinical evidence as a standalone treatment is limited, but Dong Quai is a core component of several TCM combination formulas (e.g., Dang Gui Shao Yao San) that have been studied in small trials for dysmenorrhea with some positive results. The evidence for single-herb Dong Quai specifically relieving dysmenorrhea in controlled human trials remains sparse and methodologically limited.
• Menopausal Symptoms: Despite widespread marketing as a phytoestrogenic herb for menopause, the most rigorous standalone trial—a double-blind, randomized, placebo-controlled study by Hirata et al. (1997, Fertility and Sterility, n=71) examining Dong Quai as a single herb—found no significant difference from placebo in hot flash frequency, endometrial thickness, or vaginal cell maturation. Some benefit has been observed in combination TCM formulas that include Dong Quai alongside other herbs, suggesting any benefit may require synergistic multi-herb preparations rather than isolated extract. It does not appear to exert estrogenic effects on serum hormone levels in postmenopausal women based on available human trial data.
• Menstrual Irregularity: In TCM, Dong Quai is a foundational 'blood-tonifying' herb used to regulate irregular menstrual cycles, and this remains its most prevalent traditional application. The proposed mechanism involves ferulic acid's effects on uterine smooth muscle tone and blood flow, alongside phthalide-mediated antispasmodic activity. Rigorous standalone RCT evidence in Western medicine for this specific indication is lacking; most supportive evidence comes from TCM combination formulas and traditional clinical experience rather than isolated Dong Quai trials.
• Premenstrual Syndrome (PMS): Dong Quai is included in several traditional and proprietary multi-herb formulas aimed at reducing PMS-associated bloating, mood changes, and cramping. Ferulic acid's anti-inflammatory activity and potential effects on prostaglandin pathways may contribute to symptom relief. Isolated human clinical evidence for Dong Quai monotherapy in PMS is limited to small, often uncontrolled studies, and conclusions cannot be separated from the synergistic contributions of co-administered herbs in most available research.

What are the side effects of Dong Quai?

• Photosensitivity (skin sensitivity to sunlight due to furanocoumarin content)
• Increased bleeding or bruising (anticoagulant activity from coumarin constituents)
• Gastrointestinal discomfort (nausea, bloating, mild diarrhea)
• Potential uterotonic effects: contraindicated in pregnancy
• Mild headache or dizziness
• Theoretical estrogenic stimulation: avoid in estrogen-sensitive cancers or conditions pending clearer human evidence
• Fever (reported rarely)

Good to know:

Dong Quai is generally considered well-tolerated at traditionally recommended doses for short-term use. However, it is contraindicated in pregnancy due to potential uterotonic effects, and caution is warranted in women with hormone-sensitive conditions (e.g., estrogen-receptor positive cancers) given theoretical phytoestrogenic activity, even though human estrogenic effects have not been consistently demonstrated.

How much Dong Quai should you take?

• Recommended daily: Dried root decoction: 3–15 g per day (traditional TCM range); Standardized extract capsules: 200–600 mg/day of root extract (often standardized to ligustilide content); Tincture: 1:5 preparation, 3–5 mL up to three times daily. Note: standardization varies widely across products and doses used in TCM combination formulas differ from single-herb Western supplements.
• Best time of day: Traditionally taken in divided doses with meals. No strong clinical evidence mandating a specific time of day for single-herb Western supplement use.
• With or without food: Best taken with food to minimize gastrointestinal side effects such as nausea and bloating.
• Time to effect: Menstrual cycle regulation and hormonal effects: assess over 2–3 menstrual cycles (8–12 weeks). Acute antispasmodic effects for cramping may be observed within 1–3 days of use during menstruation.
• How long to take it: Traditional TCM use is often cyclic, synchronized with the menstrual cycle. Long-term continuous use beyond 6 months has not been adequately studied for safety in Western trials; cycling is prudent. Discontinue at least 2 weeks before any surgery due to anticoagulant risk.