Educational information, not medical advice — ask your doctor or midwife.
Shimotsuto is a herbal mix used in Kampo, the herbal medicine of Japan. It is made from four dried roots, boiled as a tea or taken as granules. The name means "four substance drink".
It is given for tiredness, pale skin, dry skin and period problems. In Kampo terms, it is for people said to be low in "blood". That idea is not the same as a blood test result.
It sits on the Japanese health ministry's list of 148 Kampo formulas paid for by national health insurance. But long use in a tradition is not proof that a remedy works. Human trials of this mix are few and weak, so we cannot say how well it works.
The honest answer is that no one has shown how it works in the body.
In Kampo, the four roots are said to build and move "blood". Two of them are said to feed it. The other two are said to keep it flowing.
Lab work gives a few hints. Peony root and angelica root slow clotting in the test tube. Some parts appear to calm swelling in cells.
None of that has been shown to matter in people who take the formula. Treat the lab findings as a reason to be careful, not as proof of benefit.
Most people take it as extract granules. A sachet of powder is stirred into hot water and drunk.
You can also find it as tablets or capsules, which are easier to carry but taste less strong. Some pharmacies sell the raw cut roots for boiling at home, which takes about 30 to 40 minutes.
In Japan, brands made to the national standard are tightly checked. Products bought outside Japan vary a lot in strength, so check the label for the herb amounts.
Shimotsuto began in China as Si Wu Tang, written down in a Song dynasty formula book from about 1107.
Japanese doctors took it up and it became one of the base formulas of Kampo. Many other Kampo mixes are built by adding herbs to these four roots.
It is still in daily use in Japan, Korea and China, which is why its traditional standing is strong even though the trial record is not.
See a doctor straight away if your skin or the whites of your eyes turn yellow, your urine goes dark, or you feel deeply tired for no reason. These can be signs of liver trouble.
Get urgent help if you bleed and it will not stop, if you bruise for no reason, or if you pass black or bloody stools.
Book a normal appointment if a rash spreads, if your periods get heavier or more painful, or if tiredness keeps getting worse. Heavy periods and lasting tiredness need a blood test, not a herb.
Also tell your doctor before any operation that you take this mix.
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 Shimotsuto 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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