What is Lime?

Lime is the small, green, very sour citrus fruit of Citrus aurantifolia. In Twi it is called ankaa twadeɛ. Across West Africa the juice, the peel and the whole fruit are used in cooking and in home remedies.

It is a food first. The juice is sharp and acidic and carries vitamin C. In home use it is mixed with water, honey, ginger or herbal drinks for coughs, colds, fevers and upset stomach.

Here is the short verdict. Lime is a genuine source of vitamin C, and vitamin C prevents and treats scurvy. For colds, fever, malaria, skin problems and weight loss, good human evidence is thin or missing.

Long traditional use is not proof that something works. It is also not proof that it is safe. That caveat applies to every section below, so this page states it once.

One real hazard is worth knowing before you start. Lime juice or lime peel oil on skin, followed by sunlight, can cause a painful blistering burn. Lime juice must also never be put inside the vagina, a practice sometimes claimed to prevent pregnancy or infection.

How does Lime work?

Only one part of lime's action is settled in people: it supplies vitamin C, and vitamin C prevents and treats scurvy. Everything else below is less certain.

Lime juice is strongly acidic, mainly from citric acid. In test tubes, this acidity kills or slows several gut bacteria, including the one that causes cholera. Whether that protects a person who drinks it is not established.

The peel oil contains limonene and other aroma compounds. In laboratory tests these slow some bacteria and fungi. Skin and throat effects in people have not been shown.

Citrus juices raise the amount of citrate in urine. In small human studies with lemon juice, this changed the chemistry that lets some kidney stones form. Lime has been studied much less.

Lime also contains furanocoumarins, the compounds behind the grapefruit drug problem. In laboratory and some human studies, these block a gut enzyme called CYP3A4, which normally breaks down many medicines. That can raise drug levels in the blood.

The same furanocoumarins make skin react badly to sunlight. This effect is well documented in people and causes real burns.

What forms does Lime come in?

Most people use lime as fresh fruit, and that is the form behind almost all traditional use.

Common forms:

Fresh whole limes, squeezed for juice.

Bottled lime juice. It keeps less vitamin C than fresh juice, especially once opened.

Dried peel or fresh zest, used in cooking and in herbal mixes.

Lime essential oil, pressed from the peel. It is for scent and flavour use, not for swallowing.

Home preparations such as lime with honey, lime with ginger, or lime added to bitters and herbal drinks.

Soaps, creams and hair products containing lime oil or extract.

Capsules and powders of lime are sold, but there is no good human evidence that they do more than the fruit.

Where it comes from:

Lime has been grown and used in West Africa for centuries, after reaching the region through trade. In Ghana it is ankaa twadeɛ in Twi.

Healers and households used the juice for coughs, sore throats, fevers and poor appetite. It was often combined with ginger, honey, garlic or bitter herbs. The fruit was also rubbed on skin for blemishes and rinsed through hair for dandruff.

Lime was squeezed over food and into water where clean water was scarce. This use later drew research attention during cholera outbreaks.

Citrus fruit also has a famous place in sea travel. Ships carried lime and lemon juice against scurvy. Lime juice turned out to be the weaker of the two, and some crews still fell ill.

One traditional practice must be named plainly. Lime juice has been used in parts of West Africa as a vaginal wash, to try to prevent pregnancy or infection. Research found it damages the vaginal lining and does not work as claimed.

What does Lime help with?

• Vitamin C intake and scurvy prevention: This is the one settled use. Vitamin C prevents and treats scurvy, and lime juice supplies it. Fresh juice is a better source than bottled, since vitamin C breaks down with heat, light and time. Lime holds less vitamin C than lemon or orange, so it is a useful source rather than an outstanding one.
• Coughs, colds and sore throat: Tradition used lime with honey or ginger for coughs and colds. The honey part has some trial support for easing night-time cough in children over one year. Lime itself has not been tested for this. A warm, sweet drink may soothe the throat for a short time, but there is no evidence it shortens a cold.
• Indigestion, nausea and poor appetite: Sour drinks were used to settle the stomach and wake up appetite. Human trials on lime for these problems are essentially absent. For some people the acid makes heartburn and reflux worse rather than better.
• Fever and malaria (traditional use): Lime appears in many West African fever and malaria mixtures. Laboratory studies have tested citrus extracts against malaria parasites, with mixed results. There is no human trial showing lime treats malaria. Malaria can kill, so suspected malaria needs a test and proper medicine, not a home drink.
• Food and water hygiene during cholera outbreaks: This has the most interesting evidence after vitamin C. Lime juice kills the cholera bacterium in test tubes and in food. In an outbreak in Guinea-Bissau, people whose rice sauce contained lime juice were less likely to fall ill. That study was observational, so it suggests protection but does not prove it. Lime is not a substitute for clean water, handwashing or vaccination.
• Kidney stone prevention: Citrus juice raises citrate in the urine, and citrate can make some stones less likely to form. Most of the small human studies used lemon juice, not lime. Whether lime helps people who form stones is not established. Anyone with repeat stones should be guided by a doctor.
• Skin blemishes and dandruff (traditional use): Lime juice has long been rubbed on spots, dark marks and the scalp. Laboratory tests show lime oil slows some skin bacteria and fungi. No trial shows this works on human skin. This use also carries the clearest risk on the page, because lime juice plus sunlight can burn the skin badly.

Which foods are rich in Lime?

1. Fresh limes and fresh lime juice
2. Lime zest
3. Bottled lime juice
4. Limeade and lime cordial
5. Lime pickle and lime marmalade
6. Dishes dressed with lime, such as ceviche, salsa and pepper sauces
7. Herbal drinks and bitters made with lime

Practical Tips:

Lime is an everyday food, and food use is the best-studied way to have it.

Fresh juice holds more vitamin C than bottled. Heat, light and long storage all reduce it. Squeeze limes close to when you will use them.

Lime cordials and sweetened drinks are mostly sugar. They are not a good way to get vitamin C.

What are the side effects of Lime?

• Tooth enamel wear from frequent neat juice
• Heartburn or reflux, or worse symptoms if you already have it
• Stinging in the mouth, especially with mouth ulcers
• Stomach pain or loose stools with large amounts
• Phytophotodermatitis: a burn-like blistering rash where juice met skin that was then exposed to sun
• Dark patches on skin that can last months after such a burn
• Skin irritation or rash from lime peel oil
• Eye pain and injury if juice is splashed into the eye
• Allergic reaction, which is uncommon

Good to know:

In normal food amounts, lime is well tolerated by most people. The usual problems are minor: sour mouth, heartburn and, over time, worn tooth enamel.

The serious reaction is the sun-triggered skin burn. It is not rare in people who handle limes outdoors, and it can blister and leave dark marks for months.

Swallowed lime essential oil and lime juice used inside the vagina cause real harm. Those are not normal food uses.

How much Lime should you take?

• Recommended daily: Lime is a food, not a measured medicine, so there is no set daily amount. This page does not tell you how much to take. For scale only: home use in West Africa is usually the juice of half to one lime in a cup of water, tea or food. That is a culinary amount, not a treatment plan. Bottled lime juice is labelled as a food. It carries no medicinal dose. Lime capsules and powders have no tested dose either. Two limits are worth knowing. Do not sip neat juice all day, because the acid wears tooth enamel. Lime essential oil is not for swallowing at any amount.
• Best time of day: Time of day makes little difference for taste or for vitamin C. Two timing points do matter. Avoid lime juice late at night if you get acid reflux, since lying down can make it worse. Never put juice or peel oil on your skin before going into the sun. Wash your hands and skin well after squeezing limes outdoors.
• With or without food: Taking lime with food, or diluted in water, is gentler on the stomach and teeth. Neat juice on an empty stomach can sting and can trigger heartburn. After a sour drink, rinse your mouth with plain water. Wait about 30 minutes before brushing, since brushing straight away rubs acid into softened enamel.
• Time to effect: A warm lime drink may soothe a sore throat within minutes, but that comfort is brief. If you are low in vitamin C, signs such as bleeding gums and tiredness improve over days to a few weeks once intake rises. For colds, fever, skin marks or weight, there is no expected timeline, because there is no good evidence of effect. It may do nothing at all.
• How long to take it: As a food and flavouring, lime can be part of the diet for life. There is no known time limit for normal culinary use. As a home remedy for a cough or cold, people usually use it for a few days. If symptoms last more than a week, or get worse, see a doctor instead of continuing. Daily neat juice over months is the pattern that damages teeth. Heavy long-term use has no evidence behind it.