Dong quai is typically taken as a capsule, powder, tea (decoction), or tincture, with dosages ranging from 1 to 15 grams per day depending on the form. The dried root can also be boiled or soaked in wine, a traditional preparation still common in Chinese medicine. Because dosages vary widely across forms and concentrations, knowing what you’re taking and how it’s prepared matters more with dong quai than with many other herbal supplements.
Forms and Typical Dosages
Dong quai comes in several forms, and the right dose depends entirely on which one you’re using. For the dried root prepared as a tea or decoction (simmered in water for 20 to 30 minutes), the standard range is 3 to 15 grams per day. Powdered root, which you can mix into water or food, is generally taken at 1 to 2 grams three times daily. Tablets and capsules containing 500 mg are commonly taken up to six times per day, for a total of up to 3,000 mg.
Combination formulas, where dong quai is blended with other herbs, use much lower amounts. In these products, doses of 75 to 500 mg are typical, taken multiple times a day. Some standardized extracts use as little as 100 mg per day, concentrated to contain 1% of a key active compound called ligustilide. If you see “standardized to 1% ligustilide” on a label, that’s a marker of a more concentrated product where a lower dose goes further.
Traditionally, the dried root is either boiled in water to make a strong tea or soaked in rice wine before drinking. The powdered form is the basis for modern capsules and tablets. Tinctures, which are alcohol-based liquid extracts, are another option and are dosed by the dropperful according to the product’s concentration.
Timing and Duration
Most people split their daily dose across two or three servings rather than taking it all at once. Taking dong quai with food can help reduce any stomach upset, which some people experience at higher doses. There’s no strong consensus on how long to take it continuously. In traditional Chinese medicine, it’s often used in cycles or as part of a formula tailored to the individual rather than taken indefinitely at a fixed dose.
Sun Sensitivity Risk
Dong quai contains natural compounds called furocoumarins (psoralens) that make your skin significantly more reactive to ultraviolet light. These compounds enter your bloodstream within about 15 minutes of consumption and tend to concentrate near the skin’s surface. When UV exposure follows, the result can be anything from an unusually severe sunburn to blistering and lasting dark spots.
This isn’t a theoretical concern. Psoralen-related phototoxic reactions have caused severe burns and edema in documented cases. If you’re taking dong quai regularly, you should be deliberate about sun protection: wear sunscreen, limit prolonged sun exposure, and be especially cautious if you spend time outdoors during peak UV hours. This risk increases with higher doses and is compounded if you also eat other psoralen-rich foods like celery or parsnips.
Who Should Avoid Dong Quai
Dong quai is contraindicated during pregnancy. It has an emmenagogue effect, meaning it stimulates uterine contractions, which raises the risk of miscarriage or premature labor. Some research has also linked its use during pregnancy to possible musculoskeletal and eye malformations, though the evidence there is limited. Regardless, it’s firmly in the “do not take” category for pregnant women.
People taking blood thinners, particularly warfarin, face a serious interaction risk. Dong quai contains coumarin compounds, including ferulic acid and osthole, that inhibit platelet clumping, essentially adding to the blood-thinning effect. In one documented case, a woman taking warfarin at a stable dose saw her blood clotting time (measured by INR) spike to dangerously high levels after adding just 565 mg of dong quai once or twice daily. A month after she stopped the supplement, her levels returned to normal with no change to her warfarin dose. This tells us dong quai doesn’t alter how warfarin is processed by the body. Instead, it stacks its own blood-thinning activity on top.
If you’re scheduled for surgery, stop taking dong quai well in advance. Its anticoagulant properties increase the risk of excessive bleeding during and after procedures. A common guideline for herbal supplements with blood-thinning effects is to discontinue use at least two weeks before surgery, though your surgical team can give you a specific timeline.
Choosing a Quality Product
Dong quai supplements are not standardized across the industry, so the amount of active compounds can vary dramatically between products. Look for labels that specify the concentration of ligustilide, ideally standardized to 1%, as this gives you a more predictable dose. Products that only list “dong quai root” with a milligram amount but no standardization information leave you guessing about potency.
Third-party testing seals from organizations like USP, NSF, or ConsumerLab provide some assurance that the product contains what the label claims and isn’t contaminated with heavy metals or other substances. This matters more with herbal products sourced from root crops, which can absorb contaminants from soil. Buying from brands that publish their testing results adds another layer of confidence.