Olive (leaf and oil)

What is Olive (leaf and oil)?

What is olive, and what is it used for?

Olive is a tree grown across southern Europe and the Middle East. Its fruit is pressed for olive oil. Its leaves are dried for teas, capsules and liquid drops.

Olive oil is an everyday food. Olive leaf is sold as a health product. People take leaf products hoping to help blood pressure, cholesterol and the immune system.

Here is the short verdict. Olive oil, eaten in place of other fats, has good human evidence for heart health. Olive leaf has only small, early human trials.

Long use in European folk medicine is not proof that a remedy works. It is also not proof that it is safe. Both points matter here, because the leaf is far less tested than the oil.

This page covers both parts of the plant. Where the oil and the leaf differ, we say which one we mean.

How does Olive (leaf and oil) work?

How is olive thought to work?

The clearest effect comes from swapping other fats for olive oil. Olive oil is rich in a fat called oleic acid. Diets high in it are linked to better blood fat levels in people.

Olive oil and olive leaf also hold plant compounds called polyphenols. In lab studies, these mop up damaging molecules and calm signs of inflammation. Whether that changes health in people is a separate question.

EU regulators allow one food claim here. Olive oil polyphenols help protect blood fats from damage by oxygen. That claim rests on short human studies of blood markers, not on long-term illness.

Olive leaf is said to relax blood vessels and slow sugar uptake from the gut. Most of that work is in cells and in animals. The few human trials are small, so treat the idea as unproven.

Olive leaf also slows some bacteria and viruses in test tubes. No good human trial shows it treats an infection.

What forms does Olive (leaf and oil) come in?

What forms does it come in?

- Extra virgin olive oil, the least processed cooking and salad oil. - Refined or "light" olive oil, lower in polyphenols. - Whole olives, table olives and olive paste.

- Olive leaf tea, loose or in bags. - Olive leaf capsules and tablets, often standardised for oleuropein. - Olive leaf liquid extract and tincture.

- Olive oil skin and hair products, soaps and massage oils. - Olive oil ear drops sold in pharmacies for ear wax.

The food forms are the best tested. Leaf products are the least tested.

Table olives are salty. If you watch your salt for blood pressure or heart failure, count them in.

Where it comes from:

What did tradition claim?

The olive has been farmed around the Mediterranean for thousands of years. Greek and Roman writers wrote about the oil for food, lamps, skin and massage. The branch stood for peace, and the oil was used in religious rites.

Folk healers in Greece (ελιά), Croatia (maslina), Italy and Spain brewed the leaves as a bitter tea. It was taken for fevers, for "cleaning the blood" and later for high blood pressure.

In 19th-century Europe, olive leaf preparations were tried against malaria and other fevers. Oleuropein was isolated from the leaf in the 20th century, which renewed interest in it.

Olive oil was also a home remedy. People rubbed it on dry skin, used it to loosen ear wax, and swallowed it for constipation. These were household habits, and this page describes them rather than recommends them.

What does Olive (leaf and oil) help with?

• Heart and blood vessel health (olive oil in the diet): This is the strongest use, and it is about the oil, not the leaf. Large trials and long-term studies link a Mediterranean-style diet rich in extra virgin olive oil with fewer heart attacks and strokes. The diet as a whole was tested, so the oil is one part of the result. Olive oil is not a treatment for heart disease. It does not replace blood pressure or cholesterol medicine.
• High blood pressure: Folk healers used olive leaf tea for "pressure" long before it could be measured well. Small human trials of olive leaf extract show modest drops in blood pressure over about 6 to 8 weeks. The trials are few, short and small. That is early evidence, not proof. If you already take blood pressure medicine, adding olive leaf may push your pressure too low. Talk to your doctor first.
• Blood cholesterol: Swapping butter or lard for olive oil tends to improve blood fats in people. This effect is well documented for the oil as part of the diet. The size of the change depends on what the oil replaces. Olive leaf has shown small changes in blood fats in a few trials. The evidence is weak and not consistent.
• Blood sugar and type 2 diabetes: Tradition used the bitter leaf tea for "sugar sickness". In cells and animals, olive leaf compounds slow the breakdown of starch and may improve how the body handles insulin. A few small human trials show mild drops in average blood sugar. This is not enough to call it a treatment. Never stop or cut your diabetes medicine to try olive leaf.
• Dry skin and massage: Olive oil has been used as a skin oil for centuries, and it does soften dry skin for a time. But studies in babies and in people with eczema suggest olive oil can weaken the skin barrier. It is not a good choice for infant massage or for eczema-prone skin. For those uses, a plain fragrance-free moisturiser is a better bet.
• Constipation: A spoon of olive oil is an old home remedy for a sluggish gut. Small studies in people on dialysis and in older adults suggest olive oil can help stools pass more easily. The evidence is limited and the effect is mild. Large amounts can cause loose stools and stomach cramps.
• Softening ear wax: Warm olive oil drops are a standard home step for hard ear wax, and pharmacies sell them. Trials show oil drops soften wax and can make syringing easier. They do not always clear the ear on their own. Do not put anything in your ear if the eardrum may be burst, or if you have pain, discharge or grommets (small ear tubes).
• Colds and immune support (traditional use): Olive leaf is widely sold for winter bugs. That claim rests on lab work, not on people. In test tubes, olive leaf compounds slow some bacteria and viruses. There is no good human trial showing it prevents or shortens a cold. Treat this use as unproven.

Which foods are rich in Olive (leaf and oil)?

1. Extra virgin olive oil
2. Table olives, green and black
3. Olive paste and tapenade
4. Olive leaf tea

Practical Tips:

Extra virgin oil holds the most polyphenols and has the peppery catch at the back of the throat. Store it dark and cool, and use it within a few months of opening. Table olives are salty, so count them if you watch your salt.

What are the side effects of Olive (leaf and oil)?

• Stomach upset or nausea
• Heartburn or reflux
• Loose stools after large amounts of oil
• Headache
• Dizziness or light-headedness if blood pressure drops
• Signs of low blood sugar if you take diabetes medicine
• Skin rash or itch from olive oil on the skin
• Worse dry skin or eczema when oil is used as a moisturiser
• Rare allergic reaction in people allergic to olive

Good to know:

How common and how serious is this?

Olive oil as food is very well tolerated. Most problems are mild: a loose stool, reflux, or extra calories.

Olive leaf causes side effects in a small number of people. Stomach upset and headache are the ones reported most.

The serious risks are not from the plant itself. They come from blood pressure or blood sugar falling too far when leaf products are added to medicine. Allergy to olive is uncommon but real.

How much Olive (leaf and oil) should you take?

• Recommended daily: What do labels usually say? This is what products carry, not advice for you. Your needs may differ, so check with a pharmacist or doctor. - Olive leaf capsules often carry 500 mg to 1,000 mg a day, split into one or two doses. - Many are standardised to about 16 to 20 percent oleuropein. - Olive leaf tea is usually one cup made from a teaspoon of dried leaf. - The EU food claim for olive oil polyphenols is based on about 20 g of oil a day. That is roughly four teaspoons. Diet guidance often suggests two to three tablespoons of olive oil a day, used in place of other fats. Olive oil is still high in calories.
• Best time of day: Does timing matter? Not much. Olive oil fits with meals, as a dressing or in cooking. Olive leaf capsules are usually taken once or twice a day. Some people find the tea too bitter at night.
• With or without food: With food or without? Take olive leaf capsules with food. That lowers the chance of nausea or stomach upset. Olive oil is food, so it goes with meals by nature. Drinking it neat on an empty stomach has no proven extra benefit.
• Time to effect: How fast would anything happen? Olive oil for constipation may work within a day or two. Ear drops usually need several days of use. Blood pressure and blood fat changes, where they happen at all, took weeks in trials. Diet effects on heart risk build over years. It may also do nothing. Many people see no change at all, and that is a normal outcome.
• How long to take it: How long do people take it? Olive oil is a food. People eat it for life, as part of a normal diet. Olive leaf is different. Most trials ran only 6 to 8 weeks, so long-term safety is not known. If you are using leaf products for blood pressure or blood sugar, do not treat them as a long-term fix on your own. Review it with your doctor.