What is Robinia pseudacacia?

Robinia pseudacacia is a single homeopathic remedy — one drug, not a blend — made from the black locust tree. Its Latin name is Robinia pseudoacacia, and it is also known as yellow locust or black locust. Homeopaths use it mainly for sour stomach: burning heartburn, acid rising into the throat, and vomiting of sour fluid.

The remedy is made by soaking fresh bark or young shoots in alcohol, then diluting that liquid over and over, shaking it at each step. This is called serial dilution. At the common strength of 30C, essentially none of the original plant remains in the pellet or drop you take.

Here is the honest verdict up front: trial evidence does not separate homeopathic remedies from placebo (a dummy treatment), and no human trial of Robinia itself has been published. Long use inside a tradition is not proof that something works. This page reports the tradition and the evidence as two separate things.

How does Robinia pseudacacia work?

Homeopathy runs on an idea, not a proven mechanism. The idea is that a substance which causes symptoms in a healthy person can, once heavily diluted, prompt the body to correct those same symptoms in a sick person.

Raw black locust bark causes nausea, sour vomiting, stomach burning and weakness. Homeopaths therefore match diluted Robinia to people whose main complaint is sour vomiting and acid heartburn.

No accepted physical or chemical explanation supports this. At 30C there is essentially no source material left to act on the body. Benefit that people report may come from placebo, from natural recovery, or from other changes they made at the same time.

What forms does Robinia pseudacacia come in?

You will usually meet Robinia as small sugar pellets or as liquid drops in alcohol.

Typical over-the-counter potencies are 6C, 12C and 30C, and sometimes 6X or 30X. Higher potencies such as 200C are normally given by a practitioner. Robinia also turns up inside combination acid-stomach products alongside other remedies.

Mother tincture and very low decimal potencies are made from the raw bark and are practitioner-only. Keep pellets away from heat and strong smells, and tip them from the cap rather than handling them, which is the usual traditional advice.

Where it comes from:

Black locust is a North American tree, widely planted for timber and for its scented white flowers.

Robinia entered homeopathic practice in the United States in the mid-1800s, after provings — the homeopathic practice of giving a substance to healthy volunteers and writing down what they feel. It has stayed in homeopathic reference books ever since as a smaller remedy for hyperacidity (too much stomach acid).

Its standing sits inside homeopathy only. Herbalists do not use black locust internally, because the raw plant is poisonous.

What does Robinia pseudacacia help with?

• Heartburn and acid reflux: This is the classic reason homeopaths reach for Robinia. Books describe intense burning behind the breastbone with sour fluid coming up, worse lying down at night. No clinical trial has tested Robinia for reflux, so this rests on tradition alone.
• Sour belching and acid indigestion: Homeopathic sources describe a very sour taste, sour belches and a burning stomach after eating. The remedy is chosen by matching that symptom picture, not by any measured effect on stomach acid. There is no human evidence behind it.
• Sour vomiting in infants and young children: Older materia medica mentions babies who bring up sour, curdled milk and whose skin and nappies smell sour. This use is traditional and untested. Persistent vomiting in a baby needs a doctor, not a remedy trial.
• Headache that comes with an acid stomach: Homeopaths link Robinia to a dull headache that arrives together with acid and nausea, often at night. This pairing comes from proving records of the 1800s. No study has looked at it.
• Night-time stomach acid and burning: Symptoms said to fit Robinia are worse on lying down and often wake the person around midnight. That is a traditional prescribing clue only. If acid wakes you regularly, it is worth having the cause checked.
• Wind and colicky stomach pain: Some sources mention bloating, rumbling and cramping wind alongside the acid picture. It is a secondary traditional use. No trial supports it.

Which foods are rich in Robinia pseudacacia?

1. Black locust flowers: the only part traditionally eaten, fried as fritters in parts of Europe and Asia; the bark, seeds and leaves are poisonous
2. Acacia honey: made by bees from black locust flowers; it is a food, contains no remedy and has no homeopathic action

What are the side effects of Robinia pseudacacia?

• No effect at all: the most common outcome
• A brief flare of heartburn or nausea in the first day or two, which homeopaths call an aggravation
• Bloating or loose stools in people who react badly to lactose (milk sugar) in the pellets
• Extra sugar intake, which matters if you have diabetes
• Mouth or stomach irritation from the alcohol in liquid drops
• Nausea, vomiting, diarrhoea, weakness or an irregular heartbeat if raw plant material is swallowed, such as from bark, seeds or an undiluted tincture

Good to know:

At 30C, side effects are very unlikely, because there is essentially nothing in the pellet to cause one.

The complaints that do come up usually trace back to the carrier rather than the remedy — sugar, milk sugar or alcohol. A short worsening of symptoms is sometimes reported in the first couple of days.

The larger risk is different. Treating ongoing heartburn with Robinia can delay finding a real cause, such as an ulcer or a problem in the food pipe. Raw black locust is genuinely poisonous, so anything that is not a properly diluted remedy carries real danger.

How much Robinia pseudacacia should you take?

• Recommended daily: There is no established effective dose, because no trial has shown that Robinia does anything. Common label practice for 6C to 30C is 3 to 5 pellets, or about 5 drops, two or three times a day. Homeopathic custom gives children the same number of pellets as adults. Follow the label on the product you actually bought. Do not use the mother tincture or very low potencies on your own. Those can still contain material from a poisonous tree.
• Best time of day: Homeopathic custom is to dose between meals, roughly 15 to 30 minutes before or after food. For acid that bothers you at night, an evening dose is the usual choice. There is no evidence that timing changes the outcome.
• With or without food: Take it between meals, on a clean mouth. Traditional advice is to avoid coffee, mint and strong flavours right around the dose, though there is no evidence these matter.
• Time to effect: Homeopathic sources claim relief within minutes to a few hours for sudden heartburn. No trial supports that timing. If two or three days bring no change, it is not working for you.
• How long to take it: Keep any trial short. A few days is enough for sudden heartburn, and about two weeks is the limit for a recurring problem. If nothing has changed by then, stop. Heartburn that keeps coming back needs a proper diagnosis rather than a longer run of pellets.