Ninjinto is a four-herb Kampo formula that has been used in Japanese and classical Chinese medicine for over a thousand years. Its name means literally 'ginseng decoction,' reflecting ginseng's central role in the blend. The formula also contains Atractylodes rhizome, dried ginger, and processed licorice — a quartet specifically designed to warm the digestive center and rebuild depleted energy.

The formula works by warming what traditional medicine calls the 'middle burner' — the stomach and spleen system responsible for digesting food and producing energy. Ginseng supports stress resilience and digestive enzyme activity, Atractylodes helps regulate gut motility and fluid balance, dried ginger stimulates circulation and soothes nausea, and licorice harmonizes the herbs together while supporting the gut lining. Together they address the root pattern of cold, weakness, and digestive sluggishness rather than just individual symptoms.

In Japan, Ninjinto is most commonly prescribed as a standardized granule extract (e.g., Tsumura Ninjinto Extract Granules), making dosing consistent and convenient. Traditional practitioners may prepare it as a decocted tea from whole herbs. Tablets and powders are also available from some manufacturers.

• Chronic nausea and vomiting
• Poor appetite and digestive weakness
• Fatigue and low energy
• Cold hands and feet with digestive symptoms
• Irritable bowel and loose stools
• Chemotherapy-related nausea and fatigue
• Post-illness recovery and weakness
• Functional dyspepsia (stomach discomfort without clear cause)

• Nutritional decline during chemotherapy (supportive evidence for maintaining appetite and weight during cancer treatment)

Ninjinto is a multi-herb formula not found in food. To support the same digestive-warming, energy-building goals, focus on warm, cooked, easy-to-digest foods: slow-cooked soups and congees, ginger tea, cooked root vegetables (sweet potato, carrot, parsnip), bone broth, and mild spices like cinnamon and cardamom. Avoid raw, cold, or heavily processed foods, which burden digestive function — especially if you tend to feel cold or fatigued after eating.

• Elevated blood pressure (with prolonged high-dose use, due to licorice)
• Low potassium levels (with extended use, due to licorice)
• Mild digestive upset or bloating in some users
• Headache (occasionally, usually early in use)
• Insomnia or restlessness if taken in the evening (ginseng stimulating effect)
• Skin rash (rare allergic reaction)

• Recommended daily: Standard Japanese Kampo dosing: 7.5 g/day of Tsumura Ninjinto Extract Granules (equivalent to 15 g of raw herbs), divided into 2–3 doses. Traditional decoction: 9–15 g of combined dried herbs boiled in water, taken in divided doses.
• Best time of day: Take before or between meals — traditionally 30 minutes before eating — to support digestive preparation. Avoid taking ginseng-containing formulas late in the evening if you are sensitive to its energizing effect.
• With or without food: Best taken before meals or on a relatively empty stomach for maximum absorption and digestive benefit, though it can be taken with a small amount of warm water or food if stomach sensitivity is a concern.
• Time to effect: Acute nausea and digestive discomfort: days to 1–2 weeks. Fatigue and constitutional improvement: 4–8 weeks of consistent use.
• How long to take it: For acute digestive or nausea complaints, use for 2–4 weeks and reassess. For chronic fatigue or constitutional weakness, 2–3 months is a typical course. Extended use beyond 3 months should be monitored by a practitioner, particularly regarding blood pressure and potassium levels due to licorice content.