What is Seishoekkito?

Seishoekkito is a Japanese Kampo herbal formula. People take it mainly for summer fatigue. That means the tiredness, poor appetite, heavy sweating and weakness that hot, damp weather can bring on.

Its Japanese name means roughly "clear summer heat and boost energy".

It is a fixed blend of nine dried herbs. Most often it comes as a granule powder. You stir it into hot water, or swallow it with water.

Japan has a list of 148 Kampo formulas that doctors can prescribe, and this is one of them. The list is run by the MHLW, which is Japan's health ministry. That approval shows long use and official acceptance in Japan, not proof from modern trials.

Here is the honest verdict. The traditional record is long and steady. But we could not find good human trials showing that Seishoekkito works.

Keep one thing in mind as you read this page. Traditional use means people have valued a remedy for hundreds of years. It is not proof that it does what it is said to do.

How does Seishoekkito work?

No one has shown how Seishoekkito works in the body. The traditional story is not a tested mechanism, meaning a proven way that a remedy acts.

Kampo explains it in its own terms. Summer heat is thought to drain body fluids and "ki", a traditional idea of vital energy. The formula is meant to restore both and settle the stomach.

In modern terms, single herbs in the blend do have measurable actions in the lab. Ginseng and astragalus have been studied for effects on immune cells and on cells that make energy. Licorice clearly changes how the body handles salt, water and potassium.

None of that tells you what the whole nine-herb mix does in a person. Treat any mechanism story about this formula, this one included, as a fair guess rather than a finding.

What forms does Seishoekkito come in?

Granule powder is the standard form. In Japan it comes in single-dose sachets of dried extract, made by several licensed firms. You take it with warm water.

Other forms you may meet:

Tablets or capsules of the same dried extract. These are sold over the counter in Japan and online.

A traditional decoction. The raw sliced herbs are simmered in water and the liquid is drunk. This is less common today, and the strength varies a lot.

Outside Japan, products with this name are usually imported granules. Check the label for the full herb list. Quality control varies from supplier to supplier.

Where it comes from:

Seishoekkito comes from Chinese medicine, and Japanese Kampo took it up later. The idea goes back to Li Dongyuan in the 13th century. He wrote about heat and hard summer work draining a person's strength.

The version used in Japan follows a later Ming-dynasty recipe, written down in the 17th century. Japanese doctors used it for the seasonal exhaustion called natsubate, or summer fatigue.

It has been on Japan's national health insurance list of Kampo formulas for decades. Doctors there can prescribe it like any other medicine.

What does Seishoekkito help with?

• Summer fatigue (natsubate): This is the classic use and the reason the formula exists. Kampo practitioners pick it for someone worn out by heat. That person sweats a lot, eats poorly and feels weak rather than feverish. The evidence here is traditional. It rests on Japanese clinical experience. We could not find a trial that tested it against a dummy treatment for this use.
• Poor appetite during hot weather: Kampo texts pair the loss of appetite with the tiredness. The formula holds stomach-settling herbs for that reason, such as citrus peel and atractylodes. No human trial we could find has measured appetite or food intake with this formula. Is your appetite falling and your weight dropping? That needs a medical check, not a herb.
• Heavy sweating with weakness and thirst: Three herbs get the credit here by tradition: astragalus, ophiopogon and schisandra. They are said to hold fluids in and ease thirst. This is a traditional idea only. Heavy sweating with dizziness or confusion can mean heat exhaustion or heatstroke. That is a medical emergency, not something to treat with a herbal formula.
• Tiredness after illness: Japanese practitioners sometimes use it when energy comes back slowly after a fever. They use it most often in summer. This stretches the traditional use rather than testing it. Tiredness that lasts more than a few weeks needs a doctor's check. Causes include anaemia (too little iron, or too few red blood cells) and thyroid problems.
• Atopic dermatitis: Japanese skin doctors have reported using Seishoekkito alongside standard care for stubborn atopic dermatitis. They tend to use it when a person is tired and sweats heavily. What exists is small reports and clinical experience. We could not find a randomised controlled trial, which is a study that compares the herb with a dummy. So do not let it replace the creams or medicines your doctor has prescribed.

Which foods are rich in Seishoekkito?

1. Licorice sweets and licorice root tea: the same glycyrrhizin that this formula contains
2. Ginseng tea and ginseng drinks: the same herb as ninjin in the blend
3. Dried mandarin peel used in cooking: the same herb as chinpi

Practical Tips:

While taking this formula, cut out licorice sweets and licorice tea so your total licorice stays low.

What are the side effects of Seishoekkito?

• Stomach upset, nausea or a feeling of fullness
• Low potassium from the licorice, which can bring muscle weakness, cramps or an odd heartbeat
• Raised blood pressure from the licorice
• Swelling of the ankles, face or hands, from fluid held in the body
• Rash or itching, which can be a sign of an allergy
• Rarely, lung trouble with a dry cough, fever and shortness of breath

How much Seishoekkito should you take?

• Recommended daily: For the standard Japanese granule extract, the usual adult amount is about 7.5 g of granules per day, split into two or three doses. Always follow the amount printed on the product you actually have, because extract strength differs between makers. Doses for children and for older adults are lower and should be set by a doctor or pharmacist. There is no established dose for anyone outside those Japanese product labels.
• Best time of day: Split the daily amount across two or three doses, spread through the day. Japanese labels usually say before meals or between meals.
• With or without food: Take it on an empty stomach, about 30 minutes before a meal or between meals, following the usual Japanese instruction. If it upsets your stomach, taking it with food is acceptable.
• Time to effect: People who report a benefit usually notice it within one to two weeks. If you feel nothing after four weeks, it is unlikely to help you.
• How long to take it: Kampo formulas for summer fatigue are usually taken as a short seasonal course, not year-round. Give it two to four weeks. If nothing has changed by then, stop and get the tiredness looked at properly. If you keep taking it for more than a month, ask your doctor to check your blood pressure and your blood potassium, because of the licorice in it.