Ninjin Yoei-to (NYT) is a 12-herb Kampo formula whose name roughly translates to 'Ginseng Nourishing the Vital' — capturing its core purpose of replenishing qi (vital energy) and blood in people who are depleted. It has been prescribed in Japan and China for centuries, and today is one of the most widely studied Kampo formulas in modern Japanese clinical medicine. The formula is standardized and officially covered by Japan's national health insurance under the designation TJ-108.

NYT works through multiple pathways at once: the ginseng and astragalus component supports energy metabolism and immune function, the rehmannia and angelica combination traditionally nourishes blood and supports red blood cell production, and the polygala and schisandra herbs act on the nervous system to support memory and emotional balance. This broad, multi-herb synergy is the hallmark of Kampo — rather than targeting one mechanism, the formula gently supports several systems that tend to decline together during prolonged illness, aging, or physiological stress.

In modern Japan, NYT is almost universally taken as Tsumura TJ-108, a standardized freeze-dried granule dissolved in warm water — typically 7.5 g/day divided into 2–3 doses. Traditional practitioners still occasionally prescribe the raw decocted form. Outside Japan, the formula may be available as loose herbs for decoction or in capsule/extract form from specialist TCM suppliers.

• Fatigue and low energy (post-illness, post-surgery)
• Chemotherapy-related fatigue and anemia
• Age-related memory loss and mild cognitive impairment
• Anemia and low red blood cell counts
• Depression and low mood
• Appetite loss and unintentional weight loss
• Weakness and physical frailty in older adults
• Cold sensitivity (feeling cold all the time)
• Night sweats and dry skin after illness
• Immune system recovery after illness or treatment

• Progression of mild cognitive impairment (emerging evidence from Japanese longitudinal studies)
• Chemotherapy-induced anemia deterioration (supported by clinical trials in cancer patients)

Ninjin Yoei-to is a multi-herb formula and is not found in food. However, you can support the same energy-restoring and blood-nourishing goals through your diet. Foods particularly aligned with NYT's actions include: (1) Bone broth and organ meats — rich in iron, B12, and collagen to support blood production and recovery; (2) Beets and dark leafy greens (spinach, chard) — provide folate and iron to support red blood cell health; (3) Black sesame seeds and black beans — used in East Asian medicine as blood-tonifying foods that complement NYT's rehmannia-angelica action; (4) Goji berries — contain polysaccharides that support immune function and are traditionally paired with similar Kampo herbs; (5) Walnuts — support brain health through omega-3s and are a traditional cognitive food in Chinese medicine; (6) Warming spices (ginger, cinnamon) — echo NYT's warming, circulation-supporting properties. Avoid excessive raw, cold, or heavily processed foods during a course of NYT, as these can counteract its warming and digestive-supporting effects according to Kampo dietary principles.

• Mild nausea or stomach discomfort (especially when starting — usually resolves within 1–2 weeks)
• Reduced appetite initially (uncommon, often temporary)
• Fluid retention or bloating (related to licorice's aldosterone-like effect)
• Elevated blood pressure with long-term use at full doses (licorice-related)
• Low potassium symptoms — muscle weakness, fatigue, irregular heartbeat — with extended high-dose use
• Allergic skin reactions (rare — rash, itching)
• Liver enzyme elevation (very rare — reported in isolated Kampo case reports, not specifically linked to NYT in trials)

• Recommended daily: 7.5 g/day of standardized Tsumura TJ-108 granules, divided into 2–3 doses (most common clinical protocol in Japan). For traditional decoction, approximately 15–20 g of raw herbs per day is typical.
• Best time of day: Divided doses — one in the morning, one before or after dinner. Some practitioners recommend a third dose at midday for more severe fatigue.
• With or without food: Traditionally taken 30 minutes before meals or on an empty stomach to maximize absorption. If digestive discomfort occurs, taking with food is acceptable.
• Time to effect: Fatigue and energy: 4–8 weeks. Cognitive effects: 8–16 weeks. Blood count improvement: 4–12 weeks.
• How long to take it: Typically used for 3–6 months continuously in clinical trials. For ongoing conditions like age-related fatigue or cognitive support, long-term use under practitioner guidance is common in Kampo practice. Not typically cycled, but annual reassessment with a practitioner is recommended.