What is Shishihakuhito?

What is Shishihakuhito? It is a Japanese Kampo formula with a long history. It blends three plants: gardenia fruit (shishi), phellodendron bark (ohaku) and licorice root (kanzo).

Old texts used it for yellow skin and yellow eyes (jaundice) with a feeling of inner heat. It was also used for hot, red, itchy skin.

Japan's Ministry of Health, Labour and Welfare (MHLW) lists 148 Kampo formulas. The national health insurance (NHI) plan pays for these. This formula is on that list, so a Japanese doctor can prescribe a set-strength extract.

It is one of the less-used formulas. Only a few makers produce it.

Here is the honest verdict on proof. We found no published human trial of this formula, so its evidence grade is insufficient. What stands behind it is long recorded use in the Chinese and Japanese herb traditions.

Long use is not proof that something works. That point holds for everything below, and we do not repeat it in each part.

One thing matters more than any dosing detail. Yellow skin or yellow eyes can mean the liver or bile ducts are in trouble. It always needs a doctor, not a herb you buy on your own.

How does Shishihakuhito work?

How is it thought to work? In Kampo theory the formula clears "damp-heat" from the body. Kampo doctors link damp-heat to yellow skin, dark urine, restlessness and hot itchy rashes.

That is a traditional model of the body. It is not a description of measured biology.

Lab and animal work gives partial hints, not proof. Geniposide from gardenia has been studied for bile flow and swelling in animals. Berberine from phellodendron calms swelling and fights germs in the test tube.

None of this has been tested in people taking Shishihakuhito. Effects seen in a dish or a rodent often do not carry over. Treat any mechanism you read here as an idea still to be tested.

The best-understood ingredient action is an unwanted one. Glycyrrhizin from licorice can make the body hold on to sodium and lose potassium. Doctors call this pseudoaldosteronism (a licorice effect that copies a hormone problem).

The result can be higher blood pressure, swelling and weak muscles.

What forms does Shishihakuhito come in?

What forms does it come in? In Japan it usually comes as a dried extract granule. The granules come in single-dose sachets, given on prescription.

Some makers supply a fine powder or a tablet.

Outside Japan you may find a loose crude-herb mix. You simmer that mix to make a decoction (a herbal tea). You may also find imported granules sold under the Chinese name.

Quality and herb ratios vary by supplier. Products sold under the Chinese name may hold different amounts of licorice.

Where it comes from:

Where does it come from? The formula appears in the Shang Han Lun, a Chinese medical classic from about 200 CE. There it is called Zhi Zi Bai Pi Tang, and it was given for fever with yellow skin.

Japanese doctors took up the Shang Han Lun formulas in the Edo period (1603-1868). The Japanese name Shishihakuhito comes from that line.

Today it lives on as a minor Kampo prescription, still on the official list.

What does Shishihakuhito help with?

• Yellowing of the skin and eyes (jaundice): This is the classical indication, going back to the Shang Han Lun. There are no human trials of the formula for it. Jaundice is a symptom, not a diagnosis. It can come from hepatitis (liver inflammation), a blocked bile duct, gallstones, some medicines or blood disorders, and some of these get worse quickly. Anyone with new yellow skin or eyes needs tests, not a self-chosen herb.
• Hot, red, itchy skin and eczema-type rashes: This is the most common modern Kampo use. Practitioners pick it for skin that feels hot and inflamed rather than dry and pale, often in a person who also feels flushed or agitated. The support here is practitioner experience and case description only. We found no controlled trial comparing it with a placebo or with standard eczema treatment.
• Itching without an obvious rash: Some Kampo texts list it for itching with a heat pattern, sometimes together with other formulas. Evidence is traditional and anecdotal. Persistent itching with no rash can signal liver, kidney or thyroid problems, or iron deficiency. That is worth a blood test before trying herbs.
• Restlessness with a sensation of inner heat: Gardenia fruit is the classical ingredient for "vexation" or agitated heat in both Chinese and Japanese practice. This is a pattern description, not a recognised medical diagnosis. No human study has measured mood, sleep or agitation in people taking this formula.

Which foods are rich in Shishihakuhito?

1. Licorice sweets, licorice tea and licorice-flavoured drinks: they contain the same glycyrrhizin as the kanzo in this formula, so they add to the total
2. Gardenia (kuchinashi) yellow colouring in Japanese sweets, pickles and rice dishes — a small dietary source of the same pigment
3. Potassium-rich foods such as bananas, potatoes, beans and leafy greens — helpful while you use licorice-containing formulas, though they do not cancel the risk

Practical Tips:

Cut out licorice sweets and licorice tea while taking this formula, since the doses add together.

What are the side effects of Shishihakuhito?

• Nausea, stomach discomfort or loss of appetite
• Loose stools or diarrhoea, from the bitter gardenia and phellodendron
• Skin rash, redness or itching as an allergic reaction
• Swelling of the ankles or face, weight gain and rising blood pressure (signs of licorice-related fluid retention)
• Muscle weakness, cramps or numbness (possible signs of low potassium in the blood)
• Very rarely, severe muscle breakdown (rhabdomyolysis) with dark urine and intense muscle pain
• Rarely, a rise in liver blood-test values or drug-induced liver inflammation
• With long-term use, bowel pain and constipation from hardening of the veins in the bowel wall

Good to know:

How common and how serious? Mild stomach upset is the most likely problem and usually settles when you stop.

The serious risk to know about is pseudoaldosteronism, a licorice effect where the body holds sodium and loses potassium. It shows up as swelling, weight gain, high blood pressure and muscle weakness, and low potassium can disturb the heart's rhythm. It is well documented from Kampo formulas containing kanzo, and it is more likely in older people, in women, at higher doses and with long use.

These effects reverse when the formula is stopped, but that only helps if you notice them. Weigh yourself and check your blood pressure if you use it for more than a couple of weeks.

How much Shishihakuhito should you take?

• Recommended daily: How much is used? Follow the label or your prescriber, because brands differ. There is no dose established by clinical research. Typical Japanese granule extract dosing for an adult is about 5 to 7.5 g of granules per day, split into two or three doses. A classical decoction uses roughly gardenia fruit 1.5 to 3 g, phellodendron bark 2 to 3 g and licorice root 1 to 1.5 g per day, simmered in water. Keep a running total of all the licorice you take. If you use another Kampo formula containing kanzo, a licorice supplement or licorice sweets, the glycyrrhizin adds up and so does the risk of low potassium.
• Best time of day: When do you take it? Traditionally in two or three doses spread across the day, before or between meals.
• With or without food: With or without food? The usual Kampo instruction is on an empty stomach, about 30 minutes before a meal, with warm water. If it upsets your stomach, taking it with food is acceptable and may help.
• Time to effect: How soon? There is no reliable data. Kampo practitioners usually expect some change in skin itching or heat within several days to two weeks, and treat no response by that point as a sign the formula is the wrong fit.
• How long to take it: How long? Use it short-term and reassess. Two weeks is a reasonable checkpoint; if nothing has changed, stop and get a different opinion. Avoid months or years of continuous use. Long-term gardenia intake has been linked to mesenteric phlebosclerosis, a slow hardening of the veins in the bowel wall that can cause pain, stubborn constipation and, rarely, bowel blockage needing surgery. If you stay on it under supervision, ask for blood pressure and blood potassium checks.