Educational information, not medical advice — ask your doctor or midwife.
Perejil is parsley, the leafy green herb Petroselinum crispum. In Latin American homes it is both a kitchen herb and a home remedy. People use it as a tea, a fresh juice, a chewed sprig, or a handful in soup.
Most people meet parsley as food, and as food it suits almost everyone. The remedy use is a different thing. Strong teas, seed preparations and parsley essential oil can cause real harm.
Here is the honest verdict. Good human studies on parsley as a medicine are almost absent. Long use in a tradition tells you that people trusted it, not that it works and not that it is safe.
The short answer: no one has shown how parsley works in people, because few studies have looked.
Parsley seed and oil hold two compounds called apiol and myristicin. In animal studies these appear to speed up urine flow. In rodents they also appear to make the womb contract.
That second effect sits behind the tradition's use to end a pregnancy. It is also why high doses are dangerous. Severe bleeding, liver injury and kidney injury have been reported in people who took large amounts.
The leaf holds flavonoids, a group of plant pigments. In test tubes these mop up free radicals (unstable molecules). In cell studies they damp down some markers of swelling.
Whether any of that happens inside your body is unknown. Lab activity is not the same as a health effect. Nothing here has been confirmed in a proper human trial.
Perejil is sold and used in several forms, and they are not equally safe.
- Fresh or dried leaf, used as food and in soups. - Leaf tea, made from fresh or dried leaves. - Fresh leaf juice, often blended with water or lime.
- Capsules or tablets of dried leaf, sold as a supplement. - Seed tea and seed extract, which are far stronger. - Essential oil, which is very concentrated.
The last three carry the most risk. Seed and oil hold the most apiol. Never swallow parsley essential oil.
Strength varies a lot between products. Herbal supplements are not checked before sale the way medicines are. Two bottles with the same label can hold different amounts.
Parsley crossed to the Americas with Spanish settlers. It moved into kitchen gardens and into home healing fast. Healers treated it as a cooling, cleansing herb.
Home tradition used perejil tea for puffy ankles and slow urine. Some used it for period pain or a late period. A chewed sprig was the standard fix for bad breath.
It also had a darker role. Strong parsley preparations were used to end pregnancy. Hospitals across Latin America have recorded poisonings and deaths from that use.
Call emergency services at once if anyone has swallowed parsley essential oil, or taken parsley seed or extract to end a pregnancy. This is a poisoning, even if they feel fine at first.
Get urgent care for any of these:
- Vaginal bleeding, cramping or bleeding in pregnancy. - Yellow skin or eyes, or dark urine. - Passing very little urine, or none. - Vomiting that will not stop, or bad stomach pain. - A fast heartbeat, fainting or confusion.
Stop and see your doctor for milder signs: a new rash, swelling that is getting worse, burning urine with fever, or odd bruising while on a blood thinner (anticoagulant).
In the United States, the United Kingdom and the European Union, parsley is an ordinary food herb and seasoning. Parsley supplements are sold without the testing a medicine needs, so strength and purity vary. Apiol-rich parsley oil is controlled or restricted in some countries because of past poisonings.
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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