Educational information, not medical advice — ask your doctor or midwife.
Arnica-do-campo is a South American plant used on the skin for bruises and sore muscles. It must never be swallowed. Taken by mouth it is treated as toxic, and no safe amount by mouth has been worked out.
Its botanical name is Solidago chilensis. It is a goldenrod, not the true arnica of Europe. People in Brazil call it Brazilian arnica because it was used for the same complaints.
The leaves and flowering tops are made into washes, oils, creams and tinctures for external use. Long traditional use is not proof that it works, and it is not proof that it is safe. Human evidence for any benefit is very thin.
The short answer is that nobody has shown how it works in people. Most of what is claimed comes from lab dishes and rodents.
In cell studies, extracts of the plant damp down some inflammation signals. In rats, gels made from it reduced paw swelling and helped wounds close faster. Whether any of that happens on human skin is not established.
Folk users said it drew out bruising and eased sore muscles. That idea has not been tested in a good human trial.
Goldenrods also act as a water pill (diuretic) when swallowed. That is part of why the plant is unsafe by mouth, not a reason to drink it.
Every common form is meant for the skin only.
You may see it as a cream, gel or ointment. It is also sold as an infused oil.
Dried leaves and flowers are sold loose for washes and compresses. Alcohol tinctures are common in Brazilian markets.
Some shops sell teas and capsules. These are for swallowing, and that is exactly what makes them dangerous. Do not use them.
Homeopathic pills labelled arnica are a different product made by heavy dilution. Do not treat this page as advice about those.
Arnica-do-campo has a long record in Brazilian folk medicine. Healers used it on bruises, knocks, sprains and aching joints.
The name arnica came from the European plant. Settlers and local healers matched this goldenrod to the same jobs, so the name stuck. Related goldenrods were used in similar ways across Latin America.
Brazil's health ministry later listed Solidago chilensis among plants of interest to the public health service. That listing marked it for study and for careful topical use. It was never a sign that drinking it is safe.
Some reactions to Arnica-do-campo need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
If anyone swallows arnica-do-campo, treat it as a poisoning. Call your poison centre or emergency number straight away, even if the person seems fine.
Get emergency help now for any of these signs:
Repeated vomiting, bad stomach pain or diarrhoea. Dizziness, confusion or fainting. A fast, slow or irregular heartbeat.
Also get emergency help for trouble breathing, or swelling of the lips, face or tongue.
For skin use, stop at once if you get a rash, blisters or burning. See a doctor if the skin does not settle within a day or two.
See a doctor anyway if a bruise spreads without cause, or if a sprain is not improving after a few days.
In Brazil, Solidago chilensis sits on the health ministry's list of plants of interest to the public health service, and skin products are sold under ANVISA rules. In the United States, the United Kingdom and the European Union it is not approved as a medicine, and it is sold only as an herbal product.
Talk to a doctor, pharmacist or physiotherapist before you swap anything. These are options to raise with them, not changes to make alone.
For a fresh knock or sprain, ask about ice packs, rest and a support bandage. These are cheap and well tested.
Ask a pharmacist about a licensed pain gel, such as one with ibuprofen or diclofenac. Also ask whether a plain pain reliever (analgesic) by mouth suits you.
For a joint or muscle that keeps hurting, ask your doctor for a referral to a physiotherapist.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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