What is Rikkunshito?

Rikkunshito is a classic Japanese Kampo herbal formula composed of eight medicinal plants working together to support digestive function. It has been used in Japan for hundreds of years and is now one of the most clinically studied Kampo formulas in modern medicine. In Japan, it is a government-approved prescription medicine for gastrointestinal conditions.

How does Rikkunshito work?

Rikkunshito works by boosting levels of a gut hormone called ghrelin, which plays a big role in triggering hunger and keeping food moving through the stomach at a healthy pace. It also helps calm nausea signals and reduce inflammation in the stomach lining. Several of its plant ingredients work together to relax stomach tension, improve the coordination of digestion, and support the gut-brain connection.

What forms does Rikkunshito come in?

In Japan it is most commonly dispensed as a standardized granule powder (the TJ-43 extract) taken dissolved in warm water. Capsule forms are available in international markets. Traditional practitioners may prepare it as a boiled decoction from raw herbs, which is considered the most potent delivery method.

Where it comes from:

Rikkunshito traces back to the Chinese formula Liu Jun Zi Tang (Six Gentlemen Decoction), developed during the Song Dynasty (circa 10th–13th century CE). Japanese Kampo practitioners adapted and refined it over centuries. Today it is one of the most prescribed Kampo medicines in Japan and has been the subject of over a hundred clinical studies, particularly for cancer-related nausea and functional dyspepsia.

What does Rikkunshito help with?

• Nausea and vomiting: Rikkunshito reduces nausea by calming overactive stomach signaling and supporting smoother movement of food through the digestive tract. It has shown particularly strong results for people dealing with chronic or treatment-related nausea where standard medicines fall short.
• Functional dyspepsia (chronic indigestion): This is the condition Rikkunshito is best studied for. It helps relieve that uncomfortable feeling of fullness, bloating, and stomach pain that comes after eating even small amounts, by improving how the stomach expands and empties.
• Poor appetite and early fullness: By stimulating ghrelin — the hormone that signals hunger — Rikkunshito can reignite appetite in people who feel full after just a few bites. This makes it especially valuable for older adults and those recovering from illness.
• Chemotherapy-related nausea: Several clinical trials have shown Rikkunshito helps reduce nausea and appetite loss caused by chemotherapy drugs like cisplatin. It appears to work alongside standard anti-nausea medications rather than replacing them.
• GERD and acid reflux symptoms: Rikkunshito can ease reflux-related discomfort by improving the coordination of the lower esophagus and stomach, helping food move down more efficiently and reducing the backwash of acid.
• Gastroparesis (slow stomach emptying): By supporting the natural rhythm of stomach contractions and promoting ghrelin activity, Rikkunshito helps food move through the stomach at a healthier pace in people whose stomachs empty too slowly.
• Cachexia and cancer-related appetite loss: In patients losing dangerous amounts of weight due to cancer, Rikkunshito has shown promise for improving appetite and slowing weight loss, largely through its ghrelin-boosting effects.
• Postoperative digestive recovery: After abdominal surgery, the gut often needs help getting back on track. Rikkunshito is used in Japanese clinical practice to speed the return of normal digestion and reduce post-surgical nausea.
• Stress-related stomach upset: Stress frequently disrupts the gut-brain connection and slows digestion. Rikkunshito helps buffer this by supporting the signaling pathways between the brain and stomach that get disrupted under chronic stress.
• IBS-related bloating and discomfort: While less studied than its effects on functional dyspepsia, Rikkunshito's anti-spasmodic and motility-supporting properties may help ease bloating and cramping patterns common in irritable bowel syndrome.

What can Rikkunshito help prevent?

• Chemotherapy-induced appetite loss progression (evidence from oncology trials)
• Weight loss and nutritional decline in cancer patients receiving cisplatin-based therapy

Which foods are rich in Rikkunshito?

1. Fresh ginger: Contains the same bioactive compounds (gingerols, shogaols) found in Rikkunshito's ginger component; supports nausea relief and digestive motility on its own.
2. Mandarin/tangerine peel (dried Chenpi): Dried citrus peel is a direct component of Rikkunshito (Chinpi) and contains hesperidin and nobiletin, which support ghrelin release and digestive function.
3. Licorice root tea: Licorice root (Kanzo) is one of Rikkunshito's eight herbs; glycyrrhizin from licorice supports the anti-inflammatory and gut-calming effects of the formula.
4. Ginseng tea or broth: Panax ginseng (Ninjin) is a core ingredient in Rikkunshito; consuming ginseng independently supports appetite, energy, and digestive tone via overlapping pathways.
5. Jujube (red dates): Ziziphus jujuba (Taiso/jujube) is one of the eight herbs in Rikkunshito and is widely available as a food; supports digestive calm and provides adaptogenic support.

Practical Tips:

Rikkunshito is a multi-herb formula not concentrated in any single everyday food, but several of its eight component herbs — ginger, dried citrus peel, licorice, ginseng, and jujube — are available as foods or teas. Eating a warm, lightly spiced, easily digestible diet (congee, broths, steamed vegetables, small frequent meals) also supports the same digestive goals Rikkunshito targets. Avoid cold, raw, greasy, or highly processed foods while using this formula, as these are considered in Kampo to counteract its warming digestive effects.

What are the side effects of Rikkunshito?

• Mild stomach upset or loose stools (usually early and temporary)
• Skin rash or allergic reaction (uncommon)
• Elevated blood pressure with prolonged high-dose use (licorice-related pseudoaldosteronism)
• Low potassium levels with long-term use: watch for muscle weakness or cramps
• Rare cases of drug-induced liver injury at non-standard doses (monitor liver enzymes in long-term users)
• Not well studied in pregnancy: use with caution and consult a practitioner

Good to know:

Rikkunshito has a strong safety record in clinical trials and decades of Japanese medical use. Most people tolerate it very well at standard doses. Rare but notable concerns involve the licorice component with long-term use.

How much Rikkunshito should you take?

• Recommended daily: 7.5 g/day of the standardized TJ-43 granule extract, divided into three doses of 2.5 g each; some clinical protocols use 15 g/day for cancer-related indications
• Best time of day: 30 minutes before each meal (three times daily) — this timing aligns with Kampo tradition and is used in most clinical trials
• With or without food: Take on an empty stomach before meals; dissolve granules in warm (not hot) water for best absorption
• Time to effect: Nausea and appetite: noticeable improvement within 1–2 weeks; chronic dyspepsia: 4–8 weeks for full benefit
• How long to take it: Most clinical trials run 4–12 weeks; long-term use beyond 3 months should be supervised by a practitioner familiar with Kampo, particularly to monitor blood pressure and potassium with the licorice component