Educational information, not medical advice — ask your doctor or midwife.
Alchemilla arvensis is a small wild plant of the rose family, used in European folk herbalism as a tea for urinary complaints. Most people know it as parsley piert. Many botanists now file it under the name Aphanes arvensis.
It is a low, bushy annual with tiny green flowers. It grows on dry soil, bare ground, walls and arable fields across Europe and western Asia. The dried stems and leaves were the part used.
Here is the honest verdict on the evidence. There are no good human trials of this plant for any health use. Long use in old herbals is not proof that it works, and it is not proof that it is safe.
No one has shown how, or whether, parsley piert works in the body. There is no published human mechanism work on this species.
The old explanation was simple. Herbalists said the plant made you pass more urine, and that this flushed out grit and "stone". That idea has not been tested in people.
Like many plants in its family, it contains tannins. In test tubes, tannins bind to proteins and give a drying, puckering effect on tissue. Whether that happens anywhere in the urinary tract after you drink a tea is unknown.
So treat any mechanism story you read about this herb as a guess, not a finding.
It is sold mainly as a dried loose herb for tea.
Forms you may meet:
- Dried cut herb, brewed as an infusion. - Tea bags, often blended with other urinary herbs.
- Liquid tincture in alcohol. - Capsules of powdered herb, which are uncommon.
It is a niche product. Labels vary widely, and the plant is sometimes mislabelled with the name of the larger garden lady's mantle, Alchemilla vulgaris. Check the Latin name on the pack.
Parsley piert has a long record in British and northern European folk medicine, from the 1600s onward.
Culpeper and later herbal writers listed it for "gravel" and "the stone", meaning grit and stones in the kidney or bladder. It was also written up as a plant that increased the flow of urine. Country people sometimes ate the young leaves in salads or pickled them.
It stayed in minor British herbals into the twentieth century, usually in blends with other urinary herbs. It never became a major remedy, and it never entered mainstream medicine.
Stop taking it and see a doctor if you get a rash, swelling of the face or lips, or trouble breathing. That can be an allergic reaction.
Get urgent medical care for any of these:
- Severe pain in your back or side - Blood in your urine - Fever or chills with urinary symptoms - Being unable to pass urine - Burning on passing urine that lasts more than two days
Also see your doctor if swelling in your legs or belly does not settle. That needs a proper cause found, not a herbal tea.
In the UK and EU it is sold as a food supplement or herbal tea. It holds no licence as a medicine, so no health claims are approved for it.
In the United States it is a dietary supplement. The FDA does not review it for safety or effect before sale.
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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