Educational information, not medical advice — ask your doctor or midwife.
Pelos de elote is corn silk, the soft thread bundle inside a fresh ear of corn (Zea mays). In Latin American homes it is dried and brewed as a tea. It is used most often for urinary complaints and for puffiness from held fluid.
Each silk thread is the stigma of the corn flower. It catches pollen so one kernel can form. Cooks pull the silks off when they shuck corn, then dry them in the shade.
The honest verdict on evidence: human proof is thin. Most of what we know comes from animal and test tube work. Long use in a tradition is not proof that something works, and it is not proof that it is safe.
That said, corn silk tea is close to a food. For most healthy adults it is a mild drink, not a strong drug. The cautions below matter most if you take other medicines or have kidney or heart problems.
The main claim is that corn silk makes you pass more urine. In rats, corn silk extract raised urine output. Whether a cup of tea does the same in people is not established.
In test tube work, corn silk flavonoids mop up free radicals. In animal studies, some extracts lowered blood sugar and blood fats. These are lab and animal findings, not proven effects in humans.
Corn silk also holds a fair amount of potassium. Part of any water-shifting effect may simply come from drinking a lot of warm fluid. That is a plain explanation that trials have not ruled out.
Corn silk is sold and used in a few simple forms.
- Loose dried silk, brewed as a tea - Fresh silk, simmered in water at home - Tea bags, often blended with other herbs - Liquid extracts and tinctures in alcohol - Capsules of dried powdered silk
In Mexico and Central America the loose dried silk is still the common form. It is sold in markets and herbal stalls by weight. Commercial capsules give no clear advantage, and their strength is rarely stated well.
Corn silk has a long place in Latin American home medicine. Healers and home cooks brewed it for mal de orín, a burning feeling when passing urine. It was also given for swollen ankles and for what people called kidney gravel.
The remedy travelled with corn itself. Turkish, Chinese and North American herbal books all list corn silk for urinary complaints. Several national pharmacopoeias have included it as a mild water-shifting herb.
In the 19th and early 20th century, Western doctors sometimes used corn silk preparations for bladder irritation. That use faded as modern drugs arrived. The household tea stayed.
Stop and see a doctor if you get a fever, chills, or pain in your back or side. These can mean a kidney infection.
Also see a doctor if you see blood in your urine, or if burning lasts more than two days.
Get urgent care for swelling of the lips, face or throat, a spreading rash, or trouble breathing. Severe muscle weakness, bad cramps or a thumping heartbeat also need same-day care.
In the United States corn silk is sold as a herbal tea and dietary supplement. The FDA has not approved it to treat any disease. In the UK and EU it is sold as a food and herbal tea, and in several countries it appears in official herbal lists as a mild water-shifting herb.
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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