Ninjinyoeito

What is Ninjinyoeito?

Ninjinyoeito is a Kampo herb formula from Japan. It is a fixed blend of 12 herbs, led by ginseng. Kampo doctors give it to people who feel worn out and weak after an illness.

In Kampo it counts as a single drug. You take the whole formula as one product. You do not mix it with other Kampo formulas unless a doctor says to.

Its old name means 'Ginseng Nutrition-Nourishing Decoction'. The classic uses are weakness with poor appetite and anaemia (too few red blood cells) after being ill. Long use in Japan is not proof that it works; that is a separate question from tradition, and human trial proof here is thin.

How does Ninjinyoeito work?

No one has shown clearly how it works in the body.

Kampo explains it in its own terms. The formula is said to build up 'qi' (energy) and 'blood' when both run low. That language describes a pattern of symptoms, not a measured process.

In modern terms, ginseng and astragalus have been studied in labs for effects on tiredness and immune cells. Rehmannia and angelica are used in blends aimed at low blood counts. Most of this work is in test tubes and animals, so it does not tell you what happens in a person.

One part is well understood. Licorice root contains glycyrrhizin, which can make the body hold on to sodium and lose potassium. That is why the blend can raise blood pressure in some people.

What forms does Ninjinyoeito come in?

In Japan it is mostly sold as dried extract granules or powder in sachets. Doctors there can prescribe it, and pharmacies stock it.

Outside Japan you may find capsules, tablets or loose herbs. The classic form is a decoction, which means the herbs are boiled in water and the liquid is drunk.

Strength differs a lot between brands. Check the label for the amount of licorice or glycyrrhizin, and count any other licorice you take.

Where it comes from:

The recipe comes from a Chinese book of set formulas from the Song era, around the year 1100. In Chinese medicine it is called Renshen Yangrong Tang.

Japanese Kampo doctors took it up and still use it. Today it is an approved Kampo prescription in Japan, often given to older or frail patients.

What does Ninjinyoeito help with?

• Tiredness and weakness after an illness or surgery: This is the main Kampo use. It is given when someone eats little, tires fast and is slow to bounce back. Small Japanese studies have looked at tiredness during cancer care, but they are few and small, so the evidence stays weak.
• Poor appetite with weight loss: Kampo texts pair this formula with a weak stomach and no hunger. Some Japanese reports describe better appetite and weight in frail patients. These are mostly case reports, which cannot show cause and effect.
• Anaemia (too few red blood cells): Tradition uses it for pale skin, dizziness and weakness that Kampo calls 'blood deficiency'. That is not the same as a blood test result. Anaemia has causes such as iron loss or bleeding that need testing and proper treatment, so see a doctor first.
• Cold hands and feet with pale skin: A classic Kampo picture for this formula. No human trial has tested it for this on its own.
• Night sweats and dry cough in a frail person: Old texts list these signs. Modern proof is missing. A cough that will not go away needs a doctor, not a herb blend.
• Low mood and poor sleep during a long recovery: Kampo links these to weak qi and blood. A few small Japanese studies have looked at apathy in older patients, but they are small and not easy to check, so treat this as tradition rather than proof.

Which foods are rich in Ninjinyoeito?

This is a prepared herb formula, not a nutrient found in food. Licorice sweets and licorice tea count towards your licorice load, so skip them while you take it.

What are the side effects of Ninjinyoeito?

• Upset stomach, nausea or loose stools
• Poor appetite or a bloated feeling
• Rash or itching
• Pseudoaldosteronism (a salt and potassium imbalance), a licorice reaction that raises blood pressure, drops potassium and causes swelling and weight gain
• Low potassium, which can bring muscle cramps, weakness and an odd heartbeat
• Myopathy, meaning muscle damage with weakness and pain, linked to the same licorice effect
• Liver injury, which is rare, and may show as yellow eyes or skin, dark urine and deep tiredness
• Interstitial pneumonia, a rare lung reaction with fever, dry cough and shortness of breath

Good to know:

Most people who take it have no problem. Mild stomach upset is the usual complaint.

The serious effects are rare but real, and they are why this is not a casual daily supplement. Most of them trace back to the licorice in the blend.

Your risk goes up with a long course, a high dose, older age, or other licorice from sweets, teas or a second Kampo formula. Swelling of the legs, quick weight gain, muscle weakness or cramps are early warning signs.

Stop the formula and get medical advice if any of those show up.

How much Ninjinyoeito should you take?

• Recommended daily: No safe dose is set for use on your own. In Japan, doctors commonly prescribe about 7.5 g of the dried extract granules per day, split into two or three doses. Other brands and forms differ, so follow the label and a practitioner. Because of the licorice, the dose is not open-ended. Do not double up with other licorice products.
• Best time of day: In Japan it is usually taken two or three times a day, spaced out. Many people take a dose in the morning and one in the late afternoon.
• With or without food: The Kampo habit is to take it before meals or between meals, with warm water. If it upsets your stomach, take it with food.
• Time to effect: Kampo sources expect small changes in appetite and energy over one to three weeks. Nothing about that timing has been proven in trials.
• How long to take it: Kampo practice is to check progress after two to four weeks. If nothing has changed by then, stop and rethink. Long daily use raises the chance of a licorice reaction, so anyone taking it for months should have blood pressure and potassium checked.