Educational information, not medical advice — ask your doctor or midwife.
Peanut (Arachis hypogaea) is a legume that ripens underground. It is kin to beans and peas, not to tree nuts. In the Caribbean it is known as pistach in Haiti and maní in Cuba.
The first thing to know is the risk. Peanut is one of the most common causes of severe food allergy. For an allergic person, a trace amount can set off a reaction that threatens life.
For everyone else, peanut is food first and home remedy second. Eating nuts as part of a normal diet is linked with better heart health.
The folk uses below are far less well tested. Long use in a tradition is not proof that a remedy works. It is not proof that it is safe.
Most of what peanut does, it does as food. It is dense in protein, fat and fibre, so it makes a meal more filling.
Peanuts are rich in unsaturated fat. Studies that follow people for years link regular nut eating with less heart disease. That kind of study shows a pattern, not a cause.
In lab and animal work, peanut compounds such as plant sterols and resveratrol appear to shift cholesterol handling and inflammation. Whether that matters at normal eating amounts in people is not established.
Early feeding in babies works in a different way. Eating peanut early seems to teach the young immune system to accept it. A large trial in people showed this cuts the chance of peanut allergy.
Peanut oil on skin acts as an emollient, meaning it softens skin and slows water loss. That is a physical effect, not a drug effect.
Peanut turns up in many forms. The common ones are these:
Raw or roasted kernels, plain or salted.
Peanut butter, smooth or crunchy.
Peanut flour and low-fat peanut powder.
Peanut oil, also called arachis oil, refined or cold-pressed.
Boiled peanuts, peanut soups and stews.
Caribbean sweets and drinks, such as peanut brittle and peanut punch.
Peanut oil used as a carrier in some injected and skin medicines.
A licensed peanut powder for allergy treatment, given only by specialists.
Refined peanut oil has most of the protein stripped out. Most allergic people tolerate it, but cold-pressed oil is riskier. If you are allergic, treat any peanut oil as unsafe unless your doctor says otherwise.
Peanut came from South America and spread through the Caribbean long before Europeans arrived. It later moved with the Atlantic slave trade to West Africa and back again.
In Haitian and Cuban homes it was both a staple and a strength food. Peanut punch and peanut soup were given to people seen as thin, tired or recovering.
Healers also used the oil. It was rubbed on dry skin, scalp and sore joints. Peanut drinks were given for dry cough and to nursing mothers.
These uses were common and well known. They were never tested the way medicines are tested.
Some reactions to Peanut need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Call emergency services at once, and use an adrenaline auto-injector if you have one, for any of these after peanut:
Swelling of the lips, tongue or throat.
Trouble breathing, wheeze or a tight chest.
Widespread hives, sudden vomiting, faintness or collapse.
See your doctor within days, rather than as an emergency, for a mild rash or itch after peanut, ongoing stomach upset, or blood sugar that drifts after a big diet change. Ask for allergy testing before trying peanut again.
Peanut is an ordinary food and is sold freely across the Caribbean, the United States, the United Kingdom and the European Union. Food law in the US, UK and EU requires peanut to be declared on labels as a major allergen. A peanut powder for allergy treatment is a prescription medicine in the US and EU.
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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