Benefits of Dong Quai

Evidence-Based Benefits

• Menstrual regulation — dong quai has been used for centuries in TCM formulas for dysmenorrhea, amenorrhea, and irregular cycles; its antispasmodic and vasodilatory effects may reduce menstrual cramping
• Blood circulation — ferulic acid and ligustilide in dong quai have demonstrated anti-platelet, vasodilatory, and mild blood-thinning properties in preclinical studies
• Anti-inflammatory — ligustilide has shown anti-inflammatory effects in laboratory models, potentially reducing uterine prostaglandin-mediated pain
• Synergistic use in TCM — dong quai is most effective as part of traditional formulas like Si Wu Tang (Four Substances Decoction), where herb combinations create synergistic therapeutic effects not seen with dong quai alone

What the Research Says

Dong quai occupies an unusual position in herbal medicine — it is one of the most widely used herbs in TCM but has limited Western clinical evidence when used alone. Hirata et al. (1997) conducted the only rigorous Western RCT, studying 71 postmenopausal women given dong quai or placebo for 24 weeks. The study found no significant difference in vasomotor symptoms, endometrial thickness, or vaginal maturation between groups. Critics note this study tested dong quai as monotherapy, which contradicts traditional TCM practice where it is always combined with other herbs. Traditional formulas like Si Wu Tang have some clinical evidence from Chinese-language trials but lack the methodological rigor of Western RCTs.

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