Educational information, not medical advice — ask your doctor or midwife.
Shikunshito is a Japanese Kampo herbal formula of six herbs. It is used for weak digestion, poor appetite and low energy. Its old name is Four Gentlemen Decoction.
It is one of Japan's ministry-approved Kampo formulas, sold as Tsumura 75. Kampo practitioners give it to people who tire easily, eat little and feel bloated. It is treated as a gentle tonic blend, not as a treatment for one named disease.
Here is the honest verdict. Good human trials of this exact formula are very few. Its standing rests on long traditional use, and traditional use is not proof of effect.
One herb in it needs respect. Licorice can raise blood pressure and drop potassium, so this is not a blend to take casually or for months on end.
Kampo theory holds that the formula warms and strengthens the spleen and stomach, which that tradition sees as the core of digestion.
In animal and cell studies, parts of the blend appear to speed stomach emptying and calm gut inflammation. Ginseng compounds have been shown in animals to act on appetite signals. Whether any of this happens in people taking the formula is not established.
One effect in humans is well known, and it is a risk rather than a benefit. Licorice contains glycyrrhizin, which blocks an enzyme called 11-beta-HSD2.
Blocking that enzyme can cause pseudoaldosteronism (a salt and water imbalance that acts like a hormone disorder). The body then holds on to salt and loses potassium. That can raise blood pressure and weaken muscles.
Most people take it as a granule packet, the standard form in Japan. Tsumura 75 is the ministry-approved extract granule.
You can also find tablets, capsules and loose herbs for a decoction (a tea made by boiling). The boiled decoction is the classical form.
Granules dissolve in hot water and are usually taken warm. Strength varies between brands, so read the label each time you switch products.
The recipe first appears in a Chinese text of 1078, the Taiping Huimin Heji Jufang, as Si Jun Zi Tang.
It became a base formula that many later recipes were built on. Japanese Kampo took it up and still uses it for the pattern it calls qi deficiency.
Japan's health ministry later approved it as a standard extract granule, listed as Tsumura 75. That approval covers manufacture and reimbursement, not proof of benefit in trials.
Stop the formula and see a doctor if your face, hands or ankles swell, or your blood pressure climbs.
Get medical help the same day for muscle weakness, bad cramps, or a heartbeat that races or feels irregular.
See a doctor promptly for yellow eyes, dark urine, or new breathing trouble. Also get checked if your appetite loss, weight loss or diarrhoea lasts more than two weeks.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Shikunshito is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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