What is Ogikenchuto?

Ogikenchuto is a Japanese Kampo herbal formula. It blends seven items: astragalus root, cinnamon bark, peony root, jujube fruit, ginger, licorice root and maltose (a sugar made from grain). It is on Japan's list of 148 Kampo formulas approved for health insurance cover by the Ministry of Health, Labour and Welfare (MHLW).

Kampo doctors give it to people who feel weak, tired and run down. Common reasons include a poor appetite, night sweats, a weak stomach, tummy pain in children, and cuts or skin sores that are slow to heal.

Traditional use is not proof that a medicine works. For this formula we found no reliable human trials, so the evidence grade here is "insufficient". Its place in Kampo practice, on the other hand, is old and secure.

How does Ogikenchuto work?

Kampo explains this formula in its own terms, not in terms of body chemistry. It is said to "warm and build the middle" (support a weak stomach) and to lift qi, the body's working energy.

In plain words, it is used to top up a person who has run low: someone thin, pale, easily tired and sweaty, with a soft, tense belly.

Lab and animal studies have looked at single parts of the mix. Astragalus root has been studied for effects on immune cells, and peony root for easing muscle cramping in the gut. None of that work tells us what the whole formula does in a person.

So the honest answer is that the way it works in people has not been shown.

What forms does Ogikenchuto come in?

In Japan it is nearly always a dried granule extract, sold in single-dose sachets and dissolved in hot water. This is the form used in hospitals and clinics.

Other forms you may meet:

Fine powders and tablets made from the same extract. A traditional decoction, where the raw ingredients are simmered in water and the liquid is drunk. Imported capsules sold outside Japan, which are not covered by the Japanese insurance system and vary in strength.

The granule extract is the form nearly all published Japanese use refers to.

Where it comes from:

The recipe comes from the Jingui Yaolue, a Chinese medical text from around the 3rd century. There it is called Huangqi Jianzhong Tang, and it is the older Keishikashakuyakuto formula with astragalus and malt sugar added.

Japanese doctors took it up as Kampo developed from the 16th century onward. It is still prescribed today for thin, tired, easily sweating patients, and for children with a weak stomach.

It is a long-standing staple of Kampo rather than a modern invention.

What does Ogikenchuto help with?

• Tiredness and weakness after illness or surgery: This is the classic Kampo reason for the formula. It is chosen for a person who is thin, pale, sweats easily and tires fast. We found no controlled human trial that measured tiredness with this formula. Japanese reports are mostly single cases and clinic notes, which cannot show whether people would have picked up anyway.
• Poor appetite and a weak stomach: Kampo texts treat this as the formula's core target, and the maltose and ginger are there for exactly this pattern. The published support is traditional and observational. There is no trial we can point to that compared it against a dummy treatment for appetite.
• Night sweats: Astragalus is the ingredient credited in tradition with holding back sweat in a weakened person, and Kampo doctors still prescribe it for this. No human trial we could identify has tested this. If you have night sweats with weight loss, fever or a cough, see a doctor first, as those need a diagnosis.
• Tummy pain in children with a weak digestion: Kampo paediatric practice has used this formula for a long time in small, thin children with a soft belly and recurring stomach ache. The evidence stays at the level of clinical experience. A child's dose must be set by a doctor, and ongoing stomach pain in a child needs a proper check first.
• Slow-healing wounds and skin sores: Tradition credits astragalus with helping tissue "close over", so the formula is sometimes given alongside wound care. Human evidence here is very thin. Do not use it in place of proper wound care, and see a doctor for any wound that is hot, spreading or leaking pus.
• Getting colds often in a run-down person: Kampo uses it as a strengthening formula between illnesses, not as a treatment during a fever. We found no trial showing it cuts how often people catch colds. Claims that it boosts immunity come from lab work on astragalus, not from people.

Which foods are rich in Ogikenchuto?

1. Ginger: one of the seven ingredients, used as a warming kitchen spice
2. Cinnamon: the same bark family used in the formula, in far smaller amounts
3. Jujube (red date): eaten as a dried fruit across East Asia
4. Malt syrup: the food form of the maltose used in the formula
5. Licorice sweets: a food source of the same compound that drives the formula's risks

Practical Tips:

Eating these foods is not the same as taking the formula, but heavy licorice sweet eating adds to the same risk.

What are the side effects of Ogikenchuto?

• Swelling and puffiness in the face, hands or legs
• Weight gain from held water
• A rise in blood pressure
• Low potassium (too little potassium in the blood), which brings cramps, weakness and tiredness
• Nausea or stomach discomfort
• Loss of appetite
• Rash or itching, as an allergic reaction
• Rarely, rhabdomyolysis (a serious breakdown of muscle tissue that can damage the kidneys)
• A rise in blood sugar, because of the maltose sugar content

Good to know:

Most people take Ogikenchuto without trouble. Nearly all the known risk comes from one ingredient, licorice (kanzo).

Taken daily for weeks, licorice can raise blood pressure, hold water in the body and push potassium levels down. Doctors call this pseudoaldosteronism (a licorice side effect that copies a hormone disorder).

It is uncommon but well recorded in Japan. It is more likely at higher doses, in older people, in women, and in anyone taking several licorice-containing formulas at once.

How much Ogikenchuto should you take?

• Recommended daily: For adults, Japanese granule extract products are usually taken at about 15 to 18 g per day, split into two or three doses. The dose looks large because maltose sugar makes up much of the weight. Doses for children are set by age or body weight and should be decided by a doctor. If you take other Kampo formulas, add up the licorice (kanzo) across all of them. Most Japanese guidance keeps total licorice well controlled, and your doctor or pharmacist should do this sum for you.
• Best time of day: Split the day's amount into two or three doses, usually morning, midday and evening. Granules are stirred into hot water and drunk warm.
• With or without food: Kampo granules are usually taken on an empty stomach, about 30 minutes before a meal or 2 hours after one. If it upsets your stomach, taking it with food is acceptable.
• Time to effect: Appetite and warmth may shift within 1 to 2 weeks. Tiredness and sweating usually take 4 weeks or more, and may not shift at all.
• How long to take it: Kampo formulas for weakness are often taken for several weeks. A sensible plan is to review at 4 weeks and again at 8 weeks with whoever prescribed it. If nothing has changed by then, stop rather than carry on. Long, unwatched use is what raises the risk of licorice side effects, so if you keep taking it for months, ask for blood pressure and potassium checks.