Dang Gui Bu Xue Tang: The 5:1 Astragalus and Dang Gui Tonic Explained

Dang Gui Bu Xue Tang is the simplest blood-building soup in Chinese medicine. Two herbs. One ratio. Almost 800 years of use. A physician named Li Dongyuan wrote it down in 1247, and people have been simmering it ever since.

The surprise for most newcomers is the math. The formula uses five parts astragalus (Huang Qi) to one part dang gui (Angelica sinensis). That seems backward. The herb named "tonify the blood" is the smaller share. The bigger share is a qi herb. This guide explains why that 5:1 ratio works, what modern labs found when they tested it, and exactly how to make it at home.

Medical disclaimer: This article is for education only. It is not medical advice and does not replace your doctor or a licensed herbalist. Dang gui can thin the blood and interact with anticoagulants like warfarin. Do not use it if you are pregnant, trying to conceive, on hormone therapy, or managing a bleeding disorder, without first talking to a qualified clinician. Anemia and chronic fatigue need a real diagnosis. Herbs are not a substitute for iron testing or treatment.

Quick Answer

What it is: A two-herb Chinese tonic soup of astragalus (Huang Qi) and dang gui in a fixed 5:1 weight ratio — classically 30 g astragalus to 6 g dang gui — created by Li Dongyuan in 1247 AD to treat combined qi and blood deficiency.
Why 5:1: In TCM theory, qi "commands" and generates blood, so the formula loads up on the qi herb to power blood-making. Lab studies confirm the 5:1 ratio extracts the highest levels of the active compounds (astragaloside IV, calycosin, ferulic acid) versus other ratios.
What the science shows: In cells and mice, the combined decoction raises erythropoietin (the hormone that signals red-blood-cell production), stimulates bone marrow, and outperforms either herb used alone — though human trials are small and mostly focused on menopause, not anemia.
How to make it: Simmer both herbs together (not separately) in about 8 cups of water down to 1-2 cups, roughly 30-60 minutes. Boiling them together and using moderate heat is what unlocks the active forms of the flavonoids.

What Is Dang Gui Bu Xue Tang?

Dang Gui Bu Xue Tang (当归补血汤) translates roughly to "Dang Gui Tonify the Blood Decoction." A decoction just means herbs boiled in water and the liquid drunk as a strong tea or thin soup.

It contains exactly two herbs:

Huang Qi (黄芪) — the dried root of Astragalus membranaceus. This is the qi tonic. In TCM it strengthens the Spleen and Lung and is said to "raise" energy in the body.
Dang Gui (当归) — the dried root of Angelica sinensis, sometimes called Chinese angelica or "female ginseng." This is the blood tonic. It nourishes and moves the blood.

The formula first appeared in Neiwaishang Bianhuo Lun ("Clarifying Doubts about Injury from Internal and External Causes"), written by the physician Li Dongyuan and dated to 1247 AD. He prescribed the 5:1 weight ratio of astragalus to dang gui from the start. That ratio has survived nearly eight centuries of practice unchanged, which is itself unusual. Most classical formulas pick up modifications over time. This one mostly didn't.

A 2022 comprehensive review in Current Medical Science notes that the formula "has been widely used in the treatment of blood deficiency syndrome for more than 800 years in China" (Ma et al., 2022, PMID 36245031).

What "blood deficiency" means in TCM

Here's where Western and Chinese ideas split. In TCM, "blood" (Xue) is not only the red fluid in your veins. It's a broader concept covering nourishment, moisture, and the material base for a calm mind. "Blood deficiency" is a traditional pattern, not a lab value.

Classic signs of TCM blood deficiency:

Sign	What people report
Pale complexion	Pale or sallow face, pale lips
Fatigue	Tired even after rest, low stamina
Dizziness	Lightheaded on standing
Dry features	Dry skin, brittle nails, thin or dull hair
Sleep / mood	Trouble sleeping, restlessness, foggy thinking
Menstrual	Light, late, or scanty periods

This pattern overlaps with iron-deficiency anemia, but it is not the same thing. A person can have "blood deficiency" by TCM signs with normal iron labs, and vice versa. If you have real anemia symptoms, get a blood test. Don't self-treat a number you've never measured. For a fuller picture of the energy side of this, see our guide to TCM qi-building foods for qi deficiency.

Why Is the Astragalus-to-Dang-Gui Ratio 5:1?

This is the heart of the formula, and it has two answers — one from tradition, one from the lab. They line up surprisingly well.

The traditional logic: qi commands the blood

TCM has an old saying: "Qi is the commander of blood; blood is the mother of qi" (气为血之帅，血为气之母). The idea is that qi (functional energy) drives the body's ability to make and move blood. Without enough qi, the body can't transform food into blood no matter how many blood-nourishing herbs you eat.

So Li Dongyuan's design makes sense in that framework. To rebuild blood fast, you don't pile on blood herbs. You flood the system with the qi herb (astragalus) to power the blood-making machinery, then add a smaller dose of dang gui to supply the raw material. Five parts engine, one part fuel.

There's a second traditional concern. Dang gui is warming and moving. Used heavily and alone it can be too strong, especially in someone who is depleted. The large astragalus share is thought to "anchor" and direct the dang gui so the blood is built steadily rather than stirred up.

The lab logic: 5:1 extracts the most active compounds

Here's the part that surprises people. When researchers actually tested different ratios in the lab, 5:1 wasn't just tradition — it produced the richest extract.

A landmark 2007 study in the journal Chinese Medicine tested several astragalus-to-dang-gui ratios and measured the active compounds in each batch. The 5:1 preparation contained the highest levels of the key markers: astragaloside IV, calycosin, formononetin, and ferulic acid. The 5:1 batch had astragaloside IV roughly 2-fold higher than the 10:1 batch, which scored lowest. The authors concluded that the ancient ratio gave the best chemical and biological profile, calling it an "exemplifying" case of why traditional formulas deserve scientific verification (Gao et al., 2007, PMID 18045504).

The two herbs seem to help each other dissolve. Astragalus polysaccharides appear to improve the extraction of dang gui's compounds into the water, and vice versa. The fixed proportion isn't arbitrary. It's close to a sweet spot.

The active compounds at a glance

Compound	Comes from	What it's linked to
Astragaloside IV	Astragalus (Huang Qi)	Immune and cardiovascular activity, a key quality marker
Calycosin	Astragalus	Estrogen-like (phytoestrogen) activity, antioxidant effects
Formononetin	Astragalus	Phytoestrogen, vascular effects
Ferulic acid	Dang Gui	Antioxidant; linked to the blood-building and circulation effects
Z-ligustilide	Dang Gui	Volatile oil; circulation and smooth-muscle effects
Astragalus polysaccharides	Astragalus	Immune support, marrow stimulation

A note of caution: calycosin and formononetin act like weak estrogens. That's a plus for some menopausal complaints but a reason for caution if you have a hormone-sensitive condition. More on that below.

What Does the Science Say About Building Blood?

Most of the human-level "blood building" claims rest on lab and animal studies. The research is genuinely interesting, but it is early, and you should read it as mechanism — how the formula might work — not proof of a cure.

It raises erythropoietin (the red-cell signal)

Erythropoietin (EPO) is the hormone, mostly made in the kidneys, that tells your bone marrow to produce red blood cells. If a remedy "builds blood," boosting EPO is one plausible route.

In a 2010 study, the combined decoction increased EPO production in cultured human kidney cells. The researchers traced the effect to the hypoxia-inducible factor (HIF) pathway — the same low-oxygen sensing system the body normally uses to ramp up red-cell production at altitude. They concluded the HIF pathway plays an essential role in the formula's EPO-triggering, calling it "one of the molecular mechanisms of this ancient herbal decoction for its hematopoietic function" (Zheng et al., 2010, PMID 20723591). Cells in a dish are not a person, but it's a clean, specific mechanism.

It protects bone marrow in chemo-injured mice

A 2017 study tested the astragalus-and-angelica combination against bone marrow suppression caused by cyclophosphamide, a chemotherapy drug that wrecks blood-cell production. The combined herbs helped restore hematopoiesis (blood-cell making) better than expected, and the study probed how the two herbs interact to promote it (Li et al., 2017, PMID 28458344). This is one reason the formula shows up in supportive care research for patients recovering from chemotherapy. It is not a stand-in for medical treatment.

A modern map of how it works in anemia

A 2019 study used metabolomics plus network pharmacology — essentially a wide-angle chemical and computational scan — to model how the decoction acts in anemia. It pointed to effects on amino-acid and energy metabolism and on pathways tied to red-cell production (Hua et al., 2019, PMID 31076131). Again: a model of mechanism, generated in animals and silico, not a clinical trial in anemic humans.

The honest summary

Question	What the evidence supports
Does it raise EPO in cells?	Yes, via the HIF pathway (cell studies)
Does it stimulate marrow in animals?	Yes, including after chemo injury (mouse studies)
Is 5:1 the best ratio chemically?	Yes (lab extraction studies)
Does it cure anemia in humans?	Not established — human trials are small and not focused on anemia
Is it a replacement for iron or medical care?	No

So the formula has a believable biological story and centuries of traditional use. The gap is large, well-designed human trials. Keep that in mind before treating it as medicine. Our overview of whether Chinese food therapy actually works digs into this evidence gap across the whole field.

When Do People Traditionally Use It?

In traditional practice and in supportive-care research, Dang Gui Bu Xue Tang shows up in a few recurring situations. Listed as traditional uses, not proven treatments:

Postpartum recovery. Chinese postpartum tradition leans heavily on warming, blood-building soups during the "sitting month." This formula fits that goal. See our TCM postpartum recovery 30-day diet for how blood tonics fit the wider plan. (Do not use during pregnancy itself.)
After heavy menstrual loss. Used between periods to help rebuild what was lost, in someone with blood-deficiency signs.
Fatigue and pallor. The classic blood-deficiency picture — tired, pale, dizzy — in the absence of an acute medical cause.
Convalescence. Recovery from illness, surgery, or chemotherapy, as supportive care alongside conventional treatment.
Menopausal symptoms. The phytoestrogen compounds drove a wave of menopause research (see below).

The menopause research, briefly

Because astragalus contains estrogen-like compounds, several groups tested the formula for hot flashes and other menopausal symptoms.

The results are mixed and modest. A 2008 randomized, double-blind, placebo-controlled trial in Hong Kong Chinese women found no significant overall difference versus placebo for vasomotor symptoms; the herb edged out placebo only for mild hot flushes (Haines et al., 2008, PMID 18568789). A 2017 review in the Journal of Ethnopharmacology summarized the menopause evidence and the estrogen-like mechanism, and a 2022 paper in the Journal of Menopausal Medicine revisited the supplement's effect on menopausal symptoms (Wong et al., 2022, PMID 35534429). Bottom line: maybe a small effect on mild symptoms, not a strong one. If you're navigating this, our guide to TCM foods for menopause covers gentler dietary options.

How Do You Make Dang Gui Bu Xue Tang at Home?

The preparation matters more than people expect. Lab work shows that how you boil these two herbs changes what ends up in your cup.

The two preparation rules that actually matter

1. Boil the herbs together, not separately. Studies on the formula's chemistry found that boiling astragalus and dang gui in the same pot produces a better, more active extract than boiling them apart and mixing. The herbs interact during cooking. Co-decoction is part of the design (Gao et al., 2007, PMID 18045504).

2. Use moderate heat, not a violent boil. A 2014 study found that during moderate boiling, the glycoside forms of the flavonoids (calycosin-7-O-glucoside, ononin) get hydrolyzed into their more active, better-absorbed forms (calycosin, formononetin). The authors said their findings "supported the rationality of ancient preparation of DBT in boiling water by moderate heat" (Zhang et al., 2014, PMID 24744813). A gentle, steady simmer beats a hard rolling boil.

Basic recipe (classical ratio)

Item	Amount
Huang Qi (astragalus root slices)	30 g (about 5 parts)
Dang Gui (Angelica sinensis slices)	6 g (about 1 part)
Water	~8 cups (1.9 L) to start
Yield	About 1-2 cups of decoction
Cook time	30-60 minutes at a gentle simmer

Steps:

Rinse both herbs quickly under cool water to remove dust.
Optional but traditional: soak the herbs in the cooking water for 20-30 minutes first. This helps extraction.
Put both herbs and the water in a clay, ceramic, or glass pot. Avoid reactive metals like aluminum or cast iron; stainless steel is acceptable.
Bring to a boil, then drop to a gentle simmer. Cover loosely.
Simmer 30-60 minutes until the liquid reduces to about 1-2 cups.
Strain out the herbs. Drink the warm liquid, ideally on an empty stomach, split into one or two servings across the day.

You can do a second extraction: add fresh water to the used herbs and simmer again for a weaker second batch. Traditional decocting often does two passes and combines them.

Make it a real soup

Most home cooks turn it into a nourishing soup rather than a bitter medicinal tea. Common additions that fit the blood-building theme:

Add-in	Why it fits
Red dates (jujube / Hong Zao)	Classic qi-and-blood food; sweetens the brew
Goji berries (Gou Qi Zi)	Blood- and liver-nourishing; add in the last 10 minutes
Longan fruit	Warm, sweet blood and heart tonic
Black chicken (silkie)	Traditional blood-building protein for tonic soups
Ginger slices	Warms the middle, balances the formula
Brown sugar	Often added in postpartum versions

For the supporting ingredients, see our deep dives on Chinese red dates and their varieties and longan fruit as a blood-nourishing berry. To go deeper on the star herb itself, read our complete guide to Huang Qi (astragalus).

A note on the bitterness

Dang gui has a strong, celery-meets-musk flavor and astragalus is faintly sweet and beany. Some people love it; some don't. The red dates, longan, and goji are there partly to make it drinkable. If it tastes harsh, add more dates or a little brown sugar, and make sure you simmered gently rather than boiled hard.

Who Should Be Careful or Avoid It?

This is a potent formula, not a casual daily tea. The cautions are real.

Situation	Why it matters
Pregnancy	Dang gui can stimulate the uterus and move blood. Avoid during pregnancy.
Trying to conceive / IVF	Same blood-moving concern; check with your clinician first.
On blood thinners (warfarin, etc.)	Dang gui has anticoagulant activity and can increase bleeding risk.
Bleeding disorders / upcoming surgery	Stop well before any procedure; raises bleeding risk.
Hormone-sensitive conditions	Calycosin and formononetin are phytoestrogens; caution with estrogen-sensitive cancers or on hormone therapy.
Heavy menstrual bleeding (during the period)	Often avoided during active flow because dang gui moves blood; used between periods instead.
Diabetes / on medication	Research on metabolic effects exists; monitor and consult your prescriber.
Cold or flu (acute)	Tonic formulas are traditionally paused during acute infections — "close the door on the thief."
Diarrhea / weak digestion	Dang gui can loosen stools; reduce the dose or pause.

The phytoestrogen point deserves a second mention. The same compounds that make the formula interesting for menopause make it a question mark for anyone with a history of breast, uterine, or other hormone-sensitive cancer. When in doubt, don't guess. Ask an oncologist or a licensed herbalist who can see your full history.

Quality and sourcing also matter. Astragalus and dang gui vary a lot by grade and origin, and adulteration happens. Buy from a reputable supplier, and if you have a chronic condition, work with a licensed practitioner rather than buying random bulk herbs online.

Frequently Asked Questions

1. Why is there more astragalus than dang gui when the formula is named after dang gui? Because in TCM theory qi "commands" and generates blood, so the formula leads with the qi herb (astragalus) to power blood production, and uses a smaller amount of dang gui as the blood-nourishing raw material. Lab studies back this up: the 5:1 ratio extracts the highest levels of active compounds, with astragaloside IV roughly double that of a 10:1 batch (Gao et al., 2007, PMID 18045504).

2. Can Dang Gui Bu Xue Tang cure anemia? No. There's a believable biological story — in cells and mice it raises erythropoietin and stimulates bone marrow (Zheng et al., 2010, PMID 20723591; Li et al., 2017, PMID 28458344) — but there are no large human trials proving it treats clinical anemia. If you have anemia symptoms, get tested and treated by a doctor. The formula may be used as supportive care, not a cure.

3. How often can I drink it? Traditionally it's taken in courses, not endlessly. Many practitioners suggest a few times a week for a few weeks during a recovery phase, then a break. Daily long-term use should be guided by a licensed herbalist, especially given the bleeding and hormonal cautions. Pause it during colds, flu, or active illness.

4. Do I have to boil the two herbs together? Yes, that's part of the design. Co-decoction produces a better extract than boiling them separately, and moderate heat converts the flavonoid glycosides into their more active, better-absorbed forms (Zhang et al., 2014, PMID 24744813). Simmer them in the same pot at a gentle heat — not a hard, rolling boil.

5. Is it safe to take during my period? Often it's used between periods rather than during active flow, because dang gui moves blood and can increase menstrual bleeding. If your periods are already heavy, be especially cautious and ask a practitioner. Never use it if you're pregnant or might be.

The Bottom Line

Dang Gui Bu Xue Tang is a small formula carrying a big idea: build the blood by first building the qi that makes it. The 5:1 ratio that Li Dongyuan wrote down in 1247 turned out, eight centuries later, to be the ratio that extracts the most active compounds — a rare case where tradition and the lab agree. Modern studies give it a plausible mechanism (more EPO, more marrow activity), but the human evidence is still thin and mostly about menopause, not anemia.

Treat it as a thoughtful tonic soup with cautions, not a drug. Boil the herbs together, simmer gently, add red dates and goji if you want it drinkable, and skip it entirely if you're pregnant, on blood thinners, or managing a hormone-sensitive condition. For anything that looks like real anemia or chronic fatigue, see a doctor and get the blood test. The soup can come after the diagnosis, not instead of it.