Educational information, not medical advice — ask your doctor or midwife.
Hierba del sapo is a Mexican herb sold mainly as a tea for kidney stones, gallstones and high blood fats. Its botanical name is Eryngium heterophyllum. The Spanish name means toad herb.
It is a spiky, thistle-like plant from dry parts of northern Mexico and the US Southwest. Healers brewed the whole plant, root included. It is still sold loose in Mexican markets and online.
Here is the honest verdict. Almost no human research exists, so no health claim about it is proven. Long traditional use is not proof that it works, and it is not proof that it is safe.
No one has shown how this plant acts in the human body. The ideas below come from animal and test-tube work only.
In rats, extracts have lowered blood fats in a few small studies. Some rodent work also points to more urine being passed. That is a water pill (diuretic) effect.
In theory, more urine could help wash out tiny grit in the kidney. That step has not been tested in people.
In test tubes, extracts of related Eryngium plants slow the growth of stone crystals. Whether this happens inside a human kidney is unknown. Treat all of this as a starting point, not a result.
The usual form is the dried whole plant, sold loose by weight for tea.
- Dried stems, leaves and root for brewing. - Capsules of milled plant powder. - Liquid extracts and tinctures made with alcohol.
- Mixed kidney or cholesterol formulas that also hold other herbs. - Fresh plant, in some Mexican markets.
Blends are a real problem for a buyer. You cannot tell how much of each herb you are getting. Labels often leave out the plant part and the extract strength.
The plant grows wild in northern and central Mexico and the US Southwest. Local healers used it long before anyone wrote it down.
Mexican folk medicine treated it as a remedy for stones and for fatty blood. Market sellers offered it for gallstones, kidney grit and gout. It also went into mixes said to cleanse the blood.
Twentieth-century Mexican herbal books listed it widely, and it remains a market staple today.
Stop taking it and see a doctor if you feel dizzy, very thirsty or weak.
Get urgent care the same day for any of these:
- Severe pain in your back, side or upper belly. - Fever or shaking chills with that pain. - Yellow skin or yellow eyes. - Blood in your urine, or passing little or no urine.
Call emergency services for swelling of the lips, face or throat, or trouble breathing.
In Mexico it is sold freely as a herbal remedy and in open markets. In the United States, the United Kingdom and the European Union it may be sold as a food supplement. No medicines agency has approved it to treat any illness.
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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