Aralia cordata

What is Aralia cordata?

Aralia cordata is a tall leafy plant from East Asia. In Japan it is called udo. The young shoots are eaten as a spring vegetable.

The root is the part used in herbal medicine. In Korea it is one of the plants sold under the name dokhwal. Folk healers used it for joint pain, back pain and headache.

Here is the honest verdict. Human evidence for the root as a medicine is very thin. Nearly all the research is lab and animal work.

Long use in cooking and folk practice is not proof that it works, and it is not proof that it is safe. Both points apply to this plant. Treat the claims below as untested in people unless the page says otherwise.

How does Aralia cordata work?

No one has shown how this plant acts in the human body. The ideas below come from the lab bench, not from patients.

In cell studies, extracts of the root appear to lower the output of inflammation signals. Two diterpene acids, continentalic acid and kaurenoic acid, seem to drive much of this.

In rodents, root extracts have reduced paw swelling and pain responses. Doses in those studies were set by the researchers. They do not translate to a cup of tea or a capsule.

Some lab tests also report that the root slows certain bacteria and fungi. Whether that happens inside a person is not established.

So the honest summary is this. A plausible anti-inflammatory action has been seen in dishes and in animals. It has not been confirmed in people.

What forms does Aralia cordata come in?

You will meet this plant in two very different ways.

As food: - Fresh blanched shoots, sold in spring in Japan and Korea. - Pickled or salted shoots.

As a herbal product: - Dried root slices, simmered into a decoction (a strong tea). - Root powder, loose or in capsules.

- Tinctures, which are alcohol extracts. - Topical oils and plasters for aching joints. - One herb among many in traditional East Asian formulas.

One warning about labels. The names dokhwal and duhuo are used for more than one plant.

Some products under those names contain Angelica species instead. Buy only products that print the full Latin name.

Where it comes from:

The young shoots have been a prized spring food in Japan for centuries. Cooks blanch them to keep the stems pale and mild.

The root held a separate place in East Asian herbal practice. Korean and Japanese texts listed it among the remedies given for aching joints, stiff backs, leg pain and headache. It was usually simmered with other herbs rather than taken alone.

Practitioners also used it for what they described as wind and damp conditions. That language does not map onto any modern diagnosis. Records of this use go back several hundred years in regional materia medica.

What does Aralia cordata help with?

• Joint pain and stiffness: This is the main traditional claim. Healers gave the root for aching, stiff joints, often in a mixed formula. In rats and mice, root extracts have reduced joint swelling and pain behaviour. That is the strongest evidence there is. No good human trial has tested it for arthritis. If your joints hurt most days, get a diagnosis first.
• Low back pain: Traditional texts listed the root for lower back and leg pain. It was a core use of the herbs sold as dokhwal. There is no human trial to support this. Back pain also has many causes, some serious. Sudden back pain with leg weakness or bladder trouble needs urgent care, not a herb.
• Muscle aches: Topical plasters and oils were rubbed on sore muscles in folk practice. Warmth and massage alone can ease aches, so it is hard to judge the herb's share. No controlled study backs the skin products. Skin rash is possible in people sensitive to this plant family.
• Headache: Older records name headache among its uses, usually in a blend. The idea was that it eased pain linked to cold and damp weather. There is no modern study of this use. Frequent or severe headaches should be checked by a doctor.
• General swelling and inflammation: Lab work is the whole basis here. In cell studies, extracts appear to lower inflammation signals such as nitric oxide and certain cytokines. In animals, that showed up as less swelling. Nobody has measured this in people, so treat it as a lead, not a result.
• Food use as a spring vegetable: The blanched shoots are a normal food in Japan and Korea. People eat them in salads, soups and pickles. Eating the shoots as food is a different thing from taking root extract. Food use tells you little about the safety of a concentrated supplement.

Which foods are rich in Aralia cordata?

The young shoots, called udo, are a seasonal vegetable in Japan and Korea. They are blanched, pickled or added to soup. Eating the shoots is not the same as taking a root supplement.

What are the side effects of Aralia cordata?

• Nausea
• Stomach upset or cramping
• Loose stools
• Tingling or itching in the mouth from fresh shoots
• Skin rash from handling the plant
• Allergic reaction in people sensitive to the ginseng and ivy family

Good to know:

Most reports are mild and come from the stomach. The soapy saponins are the likely cause.

Serious harm has not been reported, but that is partly because almost no one has studied it. Absence of reports is not the same as proof of safety.

Stop if you get a rash, swelling or trouble breathing. Those point to an allergy.

How much Aralia cordata should you take?

• Recommended daily: There is no dose proven to work in people. What follows is only what labels and old texts tend to print. Traditional East Asian texts list about 3 to 9 grams of dried root per day, simmered as part of a formula. Capsule labels vary widely and often do not state extract strength. This is background, not advice for you. If you take any regular medicine, ask a pharmacist or doctor before starting.
• Best time of day: Timing does not matter much, because no effect has been proven. People who use it tend to split it across the day. If it upsets your stomach, taking it earlier in the day may help you notice problems before bedtime.
• With or without food: Taking it with food is the gentler choice. The saponins in the root can irritate an empty stomach. Food may slow how fast the compounds are absorbed. That matters little when no effect is proven.
• Time to effect: Nobody can give you an honest number. No human trial has measured how fast it works, or whether it works at all. Traditional use suggests days rather than hours. It may well do nothing for you.
• How long to take it: No trial has set a safe length of use. Traditional use was usually short, over weeks, for a flare of pain. Long daily use of the concentrated root has not been studied at all. If pain lasts more than a few weeks, that is a reason to see a doctor, not to keep dosing.