Goshajinkigan

What is Goshajinkigan?

Goshajinkigan (GJG) is a traditional ten-herb Kampo formula that has been used in Japan and China for centuries to support what East Asian medicine calls 'kidney yang' — the body's warming, activating energy tied to aging, nerve health, and lower body vitality. It is one of the most widely prescribed Kampo formulas in Japanese clinical practice today, available as a standardized extract through licensed Kampo practitioners and in some integrative oncology settings. The formula builds on the classical Chinese prescription Jinkigan (Shen Qi Wan) with the addition of Achyranthes and Plantago to strengthen its action on the lower limbs and urinary tract.

How does Goshajinkigan work?

The formula works through several overlapping pathways. Its herbs collectively support healthy nerve signaling, reduce oxidative stress in nerve tissue, and promote circulation to the extremities — which explains why it's used for both neuropathy and cold, weak legs. Rehmannia and Cornus provide antioxidant and anti-inflammatory support, while processed aconite is thought to improve peripheral blood flow and reduce pain signaling. Plantago seed and Alisma support fluid metabolism, which is why the formula is effective for urinary discomfort as well.

What forms does Goshajinkigan come in?

In Japan, GJG is most commonly prescribed as a standardized hot-water extract granule (Tsumura formulation, TJ-107), which is the form used in most clinical trials. Tablet and capsule forms are available in integrative health settings. Traditional decoction involves simmering the raw herbs — this is closer to the classical preparation but less convenient. Granules dissolve in hot water and are taken two to three times daily.

Where it comes from:

The formula originates from the Song Dynasty Chinese medical text 'Jisheng Fang' (1253 CE), where it was described as a treatment for kidney deficiency with lower body weakness, urinary difficulty, and painful joints. It was adopted into Kampo practice in Japan and has been in continuous clinical use for over 750 years. Today it is one of approximately 150 standardized Kampo formulas reimbursed under Japan's national health insurance system.

What does Goshajinkigan help with?

• Chemotherapy-induced nerve pain (CIPN): This is the most clinically studied use of GJG. When chemotherapy drugs like oxaliplatin damage the nerves in the hands and feet, GJG has been shown to reduce tingling, numbness, and pain — especially when started early in treatment. It appears to protect nerve tissue from oxidative damage caused by these drugs.
• Diabetic neuropathy and nerve pain: GJG has been studied for the nerve pain, tingling, and numbness that develop in people with long-term diabetes. The formula's combination of antioxidant and circulation-supporting herbs may help protect and repair the small nerve fibers most affected by high blood sugar over time.
• Overactive bladder and frequent urination: GJG is one of the most commonly prescribed Kampo formulas for urinary urgency, frequent nighttime urination, and difficulty fully emptying the bladder — particularly in older adults. Clinical trials have found improvements in urinary frequency and quality of life comparable to some conventional medications.
• Cold, weak, or numb legs (lower body circulation): In Kampo tradition, GJG is specifically directed at the lower half of the body — the legs, lower back, and feet. It is used when people feel persistent coldness, weakness, or heaviness in their legs, especially in older adults. The formula's warming herbs support circulation to the extremities.
• Urinary incontinence in older adults: Several Japanese clinical trials have looked at GJG for urge urinary incontinence — the sudden, hard-to-control need to urinate. Results suggest it can meaningfully reduce accidental leakage episodes and is generally well tolerated in the elderly population who often take multiple medications.
• Oxaliplatin neuropathy (cancer treatment side effect): Oxaliplatin, used in colorectal cancer treatment, causes particularly severe nerve pain in the hands and feet. GJG has been specifically trialed in colorectal cancer patients receiving this drug, with results showing reduced severity of nerve symptoms without interfering with chemotherapy effectiveness.
• Age-related lower body weakness and fatigue: In Kampo medicine, the kidney system governs aging, bone strength, and lower body vitality. GJG is a go-to formula for older adults experiencing a cluster of symptoms — lower back fatigue, leg weakness, reduced energy — that traditional medicine links to declining kidney vitality.
• Lower back pain and kidney deficiency (Kampo): GJG is traditionally indicated for lower back pain that is accompanied by fatigue, cold extremities, and urinary changes — the classic signs of what Kampo calls kidney yang deficiency. It addresses the root pattern rather than just the pain symptom.

What can Goshajinkigan help prevent?

• Progression of chemotherapy-induced peripheral neuropathy when started early in treatment
• Worsening of urinary urgency episodes in adults with overactive bladder

Which foods are rich in Goshajinkigan?

1. Black sesame seeds: A traditional kidney-nourishing food in East Asian medicine, supports the same 'kidney yin and yang' pathway that GJG targets; rich in zinc, antioxidants, and healthy fats that support nerve and hormonal health.
2. Walnuts: Long used in Chinese medicine to support kidney yang and lower back strength; provide omega-3 fatty acids and polyphenols that support nerve tissue health — a core target of GJG.
3. Black beans: Deeply pigmented legumes traditionally associated with kidney support in East Asian dietary therapy; provide magnesium, B vitamins, and antioxidants that support nerve and circulatory health.
4. Goji berries (wolfberries): Closely related to one of GJG's key ingredient families (Lycium); support antioxidant protection of nerve tissue and are used in traditional kidney-nourishing dietary prescriptions alongside GJG-type formulas.
5. Warming spices (cinnamon, ginger): Cinnamon is one of GJG's ten ingredients and supports peripheral circulation; ginger similarly promotes blood flow to the extremities. Including both in the diet supports the formula's warming circulatory goals.

Practical Tips:

Goshajinkigan is a multi-herb formula with no single food equivalent. The dietary pattern that best supports its goals is the traditional East Asian longevity diet: emphasizing dark-colored vegetables, fermented foods, warming spices, and moderate amounts of high-quality animal protein (particularly bone broth and fish), while avoiding cold, raw, and processed foods that traditional medicine considers taxing to kidney vitality and digestive warmth.

What are the side effects of Goshajinkigan?

• Nausea or stomach upset (most common, especially on empty stomach)
• Loose stools or mild diarrhea
• Loss of appetite
• Skin rash (rare allergic response)
• Palpitations at high doses (due to aconite alkaloid content: rare at standard doses)
• Elevated liver enzymes (very rare; reported in isolated cases with long-term use)

Good to know:

GJG is considered well tolerated in clinical trials, with most adverse effects being mild and digestive in nature. The presence of processed aconite means this formula should be used under professional guidance rather than self-prescribed at high doses.

How much Goshajinkigan should you take?

• Recommended daily: Standard Japanese clinical dose: 7.5 g per day of the standardized Tsumura extract granule (TJ-107), typically divided into two to three doses. This is equivalent to approximately 15 g of the raw herb combination daily.
• Best time of day: Traditionally taken before meals — typically 30 minutes before breakfast, lunch, and dinner when using the three-times-daily dosing schedule.
• With or without food: Traditionally taken before meals on a relatively empty stomach to maximize absorption. If stomach upset occurs, taking with a small amount of warm food or dissolving granules in warm water can help.
• Time to effect: Urinary symptoms: 2 to 4 weeks. Neuropathy and nerve pain: 4 to 12 weeks of consistent use.
• How long to take it: Clinical trials have used GJG continuously for 12 to 24 weeks. For ongoing conditions like overactive bladder or diabetic neuropathy, long-term use under practitioner guidance is common in Japan. For chemotherapy support, it is typically used throughout the duration of treatment. Periodic reassessment every 3 months is recommended.