Shikunshitokakeigairengyo

What is Shikunshitokakeigairengyo?

What is Shikunshitokakeigairengyo?

It is a Japanese Kampo herbal formula taken as a water extract. The name means Shikunshito with keigai and rengyo added. Shikunshito is an old blend used for weak digestion and low energy.

Keigai is the flower spike of Schizonepeta. Rengyo is the fruit of Forsythia. In Kampo they were added for long-running skin, nose and ear complaints in people seen as frail.

The formula sits on the list of Kampo medicines that Japan's health ministry (MHLW) allows insurance to cover. It is seldom stocked outside Japan.

Here is the honest verdict. There are no useful human trials of this exact formula. Long use inside a tradition is not proof that it works, and it is not proof that it is safe.

How does Shikunshitokakeigairengyo work?

How is it meant to work?

No one has shown how this formula acts in the body. The explanation offered for it is a traditional one, not a measured body process.

In Kampo terms, the base blend was said to build "ki" (vital energy) and steady the digestion. Keigai and rengyo were said to clear "heat" and move stuck discharge. These are old ideas, not test results.

Lab work exists on the single herbs, not on the finished formula. In test tubes and in animals, Forsythia extracts appear to damp some inflammation signals. Whether that happens in a person drinking the granules is not known.

One effect is real and well documented in people. Licorice root (kanzo) supplies glycyrrhizin, which can make the body hold sodium and lose potassium. That is a side effect, not a benefit, and it drives most of the cautions on this page.

What forms does Shikunshitokakeigairengyo come in?

How is it sold?

In Japan it is mostly a dried extract granule, packed in single sachets. A fine powder and a tablet form also exist.

Some practitioners still boil the raw dried herbs into a decoction (a strong tea). That form is less common now.

Outside Japan you are unlikely to find it in a shop. Imported granules and online sellers are the usual route, and quality control on those is uneven.

Where it comes from:

Where does it come from?

The parent formula, Shikunshito, appears in a Chinese Song dynasty text from around the 12th century. Japanese Kampo doctors later adopted it widely.

The modified version added keigai and rengyo. Practitioners used it for children and adults they judged to have weak digestion and poor stamina. Chronic weeping skin, runny nose and discharging ears were the typical targets.

It was carried into Japan's modern insurance formulary in the 20th century. That listing reflects traditional standing and manufacturing rules. It does not reflect trial results.

What does Shikunshitokakeigairengyo help with?

• Long-running skin eruptions in people with weak digestion: This was the main traditional target. Practitioners chose it for pale, tired patients with slow-healing weeping skin. No controlled human trial supports that use.
• Chronic ear discharge: Kampo texts described it for a long-running discharging ear in a frail child. There is no modern trial evidence. Ear discharge needs a doctor's assessment, since it can signal infection or damage.
• Chronic stuffy or runny nose: Keigai and rengyo were added partly for nose and sinus symptoms. Evidence in people is absent for this formula. Related Kampo blends have been studied more, but those results do not transfer.
• Poor appetite and low energy: This is the classic use of the Shikunshito base. It was given for weak digestion, loose stool and tiredness. Human trial data for the base formula is thin, and for this version there is none.
• Repeat boils and small skin infections: Rengyo was traditionally used to help the body settle recurring sores. Lab tests show some Forsythia compounds slow bacteria in a dish. Whether that helps a boil on skin is not established.

Which foods are rich in Shikunshitokakeigairengyo?

This is a multi-herb medicine, not a nutrient you get from food. No food supplies it. Do keep licorice sweets and licorice tea out of your diet while using it, since they add to the same risk.

What are the side effects of Shikunshitokakeigairengyo?

• Nausea or stomach discomfort
• Loose stool or mild belly pain
• Rash or itching
• Swollen ankles or puffy face
• Weight gain from fluid
• Rising blood pressure
• Low potassium (hypokalaemia), felt as muscle weakness or cramps
• Rare liver irritation, with yellow skin or dark urine
• Rare lung inflammation, with fever, dry cough and breathlessness

Good to know:

Most people who take it have no trouble. Mild stomach upset and rash are the usual complaints.

The licorice effects matter more. Fluid build-up, high blood pressure and low potassium can appear with higher amounts or long use. Older people and those on water pills are most at risk.

Liver and lung reactions are rare but serious. They are known across the Kampo class, not unique to this formula. Both need prompt medical care.

How much Shikunshitokakeigairengyo should you take?

• Recommended daily: Japanese extract granule packs usually carry an adult daily amount of roughly 5 to 7.5 grams. It is split across two or three servings. Child amounts are lower and are set by weight or age. That is what labels say. It is not advice for you. The herb list and strength differ between makers, so the pack figure is the only one that applies to that pack. In Japan this is handled as a prescribed medicine. A Kampo-trained doctor or pharmacist should set any amount, especially for a child.
• Best time of day: Kampo granules are traditionally taken between meals or shortly before them. Warm water is the usual carrier. Timing is a custom, not a proven factor. Taking it at the same times each day mainly helps you remember it.
• With or without food: It is usually taken on a fairly empty stomach, between meals. That is the standard Kampo habit. If it makes you feel sick, taking it with a little food is reasonable. Tell your prescriber if nausea keeps happening.
• Time to effect: No honest timeframe can be given, because the formula has not been tested in people. Traditional practice expects some change in digestion or energy within two to four weeks. It may also do nothing at all. If nothing has changed after a month, there is no reason to keep going.
• How long to take it: How long do people take it? Kampo practitioners usually review a formula after two to four weeks. If nothing has shifted, they change it. Long unbroken use matters here because of the licorice content. Problems with potassium and blood pressure build up over weeks to months. Anyone using it for long stretches needs blood pressure and potassium checks.