Lime

Overview

Lime is a small, round, intensely tart citrus fruit, usually picked and used while still green, prized for its sharp acidity and distinctive aroma. The name "lime" most commonly refers to Citrus aurantiifolia (the key lime) and the more widely sold Citrus latifolia (the Persian or Tahiti lime). Across the world's cuisines — from Mexican and Southeast Asian cooking to Caribbean and Indian food cultures — lime is a foundational souring and flavoring ingredient, squeezed over dishes, blended into drinks, and used as zest. Like other citrus fruits, it contributes citric acid, aromatic peel oils, and a modest amount of vitamin C. This page is educational and does not recommend lime as a treatment for any condition.

A point of frequent confusion is worth settling up front: the citrus fruit lime described here is entirely different from "lime blossom" or "linden flower," which come from the unrelated Tilia tree and are used as an herbal tea. This page covers only the green citrus fruit. As with lemon, lime's popular reputation often leans on vitamin C and "detox" or "cleanse" narratives that go well beyond the evidence; the sections below separate the ordinary food from the marketing claims.

What it is

Lime is the fruit of small evergreen citrus trees in the Rutaceae family. Two types dominate commerce: the key lime (Citrus aurantiifolia), smaller, seedier, more aromatic, and more acidic; and the Persian or Tahiti lime (Citrus latifolia), larger, seedless, and the most common supermarket lime. Like other citrus, a lime has three functionally distinct parts: the juicy, highly acidic pulp and juice; the bitter white pith; and the thin green outer peel or zest, which concentrates fragrant essential oils including limonene. Limes are typically harvested and used while green and unripe; left to ripen, they turn yellow and lose some of their characteristic tartness.

Nutritionally, lime juice supplies citric acid (the source of its sourness), a modest amount of vitamin C (ascorbic acid), small quantities of potassium, and various plant flavonoids. It is important to distinguish the whole fruit from concentrated derivatives: lime essential oil is a potent extract of the peel oils, and "lime" as a fragrance or flavoring is not the same as the fresh fruit. To repeat the key disambiguation, the citrus fruit lime is unrelated to linden flower (also sold as lime blossom), a Tilia tree flower used as a calming herbal infusion. The two share a name in some regions but are botanically and culinarily distinct.

Traditional use (educational)

Lime has deep roots in the food and home traditions of tropical and subtropical regions worldwide. In Mexican, Southeast Asian, Caribbean, Indian, and Middle Eastern cuisines, lime juice and zest are everyday souring agents, used to brighten foods, balance rich or spicy dishes, and flavor drinks. Beyond cooking, lime — like lemon — has appeared in folk household routines as a cleaning and freshening agent and as a flavoring for water and teas. Warm or cool lime drinks, sometimes sweetened with honey or sugar, are common comfort beverages in many cultures.

Historically, limes hold a notable place in the story of scurvy prevention: British naval provisioning of citrus (which at times relied heavily on limes) gave rise to the nickname "limey." This reflects the vitamin C content of citrus fruit generally rather than any property unique to lime, and indeed limes were later found to be a less reliable vitamin C source than lemons in some preserved forms. Dried whole limes (sometimes called black limes or loomi) are a distinctive ingredient in Persian and Gulf cooking, prized for their deep, tangy, fermented-tasting flavor. These traditional and culinary contexts are offered for educational and cultural background only and do not establish that lime treats or prevents any condition.

What research says

As with lemon, there is little direct clinical research on whole lime as an intervention, and most relevant evidence concerns its components (vitamin C, citrus flavonoids, citrate) or citrus fruit consumption within broader dietary patterns. The evidence can be grouped into distinct tiers:

• Lab/in vitro: Laboratory work has characterized lime's chemistry — the antioxidant behavior of vitamin C and flavonoids, and the properties of peel oils such as limonene — describing chemical activity in controlled settings rather than effects in people.
• Animal: Some animal and laboratory studies have examined citrus-derived compounds for various biological activities; such findings are preliminary and do not translate directly to human outcomes or to eating the fruit.
• Human and population: Most human evidence treats citrus or vitamin C intake as part of overall diet rather than isolating lime. Vitamin C's role in preventing deficiency (scurvy) is firmly established, and citrate from citrus is studied in the context of urinary chemistry and kidney-stone risk, an area of ongoing scientific interest. These do not show that lime specifically provides extra benefit in well-nourished people.
• Traditional/cultural: The use of lime drinks for refreshment and comfort during illness rests on cultural practice and the general value of fluids, not on controlled trials demonstrating a medicinal effect.

Limitations: Popular claims that lime "detoxifies," "alkalizes," or "burns fat" lack credible support; the body regulates its own pH and clearance independently of dietary acidity. Where benefit is plausible, it generally reflects overall fruit and vitamin C intake rather than lime as a singular agent.

Safety & interactions

Lime in ordinary culinary amounts is considered safe for most people, and the main practical considerations mirror those of other acidic citrus. Its high acidity means frequent or prolonged exposure of teeth to lime juice can contribute to enamel erosion over time, so continuously sipping acidic lime drinks is generally discouraged; using a straw and rinsing with water afterward are common practical suggestions. For some people, acidic foods including lime can aggravate acid reflux, heartburn, or indigestion, though tolerance varies considerably between individuals.

A distinctive caution specific to lime is phytophotodermatitis: lime peel and juice contain furanocoumarins (psoralens), and when lime juice contacts the skin and that skin is then exposed to sunlight, it can trigger a delayed burn-like rash and lingering dark pigmentation — sometimes called "margarita dermatitis" because it is associated with handling limes outdoors. Washing the skin and avoiding sun exposure after contact reduces this risk. While lime contains furanocoumarins, the clinically significant grapefruit–drug interaction is most strongly associated with grapefruit; anyone specifically advised to avoid citrus with a medication should still follow that guidance. Concentrated lime essential oil is a separate, far more potent product with its own (including photosensitizing) considerations and should not be equated with the fruit.

Who should be cautious

People who experience acid reflux, gastroesophageal discomfort, or frequent heartburn may find acidic foods including lime contribute to their symptoms and may wish to adjust intake to their own tolerance. Those with sensitive teeth or enamel wear may want to be mindful of how often and how they consume acidic lime drinks, and people with canker sores or mouth irritation may find acidic juice stings during a flare. Anyone who handles large quantities of limes outdoors — bartenders, cooks, and gardeners — should be aware of the phytophotodermatitis risk and wash their hands and skin afterward.

People with citrus allergies should avoid lime. As with any dietary question that goes beyond ordinary culinary use, individuals managing specific medical conditions, taking medications with dietary restrictions, or who are pregnant or breastfeeding and uncertain are best served by discussing their particular situation with a qualified healthcare professional. Lime is a food, not a substitute for medical care of persistent symptoms.

Quality & sourcing considerations

Choosing good limes is largely a matter of feel and appearance: look for fruit that is firm, glossy, and heavy for its size (heavier limes tend to be juicier), with smooth, brightly colored skin and no soft spots, dryness, or mold. Thin-skinned limes generally yield more juice than thick-skinned ones. Because the zest is widely used and concentrates surface oils, many people prefer thoroughly washed or organically grown limes when zesting, to limit residues from waxes or agricultural treatments.

Fresh-squeezed lime juice retains more vitamin C and a brighter, more aromatic flavor than bottled juice, which is pasteurized and may contain preservatives; vitamin C declines with heat, light, and storage time regardless of source. Whole limes keep for a week or more at room temperature and longer refrigerated, while cut limes and fresh juice are best refrigerated and used within a few days. Lime zest can be dried or frozen to extend its use, and dried whole limes (loomi) are a shelf-stable specialty ingredient in their own right. As with any whole food, "quality" here means freshness, flavor, and food safety rather than any standardized health potency.

FAQs

Is lime the same as linden or "lime blossom" tea?
No — this is a common and important mix-up. The citrus lime described here is the green, tart fruit. "Lime blossom" and "linden flower" refer to the dried flowers of the Tilia tree, an unrelated plant used as a calming herbal infusion. They share a name in some regions but are botanically and culinarily different; see linden flower for that herb.

Is lime water good for you?
Lime water is a refreshing, low-calorie way to flavor plain water and add a small amount of vitamin C, which may help some people drink more fluids. Claims that it detoxifies, alkalizes, or boosts metabolism are not supported by evidence, since the body manages its own pH and waste clearance regardless of lime intake. It's a fine drink for taste and hydration, not a health treatment.

Why does handling limes sometimes cause a skin rash?
Lime peel and juice contain natural compounds called furanocoumarins. When lime juice gets on the skin and that skin is then exposed to sunlight, it can cause a delayed, sometimes severe rash and dark patches — a reaction called phytophotodermatitis (sometimes "margarita dermatitis"). Washing lime juice off the skin and avoiding sun exposure afterward reduces the risk.

Does lime help with a cold?
Lime drinks can be a soothing, palatable source of fluids and a little vitamin C during a cold, but there is no strong evidence that lime prevents, shortens, or cures one (see cold and sore throat). Any general benefit is most plausibly tied to overall fluid and vitamin C intake rather than to a specific effect of lime.

Is lime juice as acidic as lemon?
Yes, broadly — both are highly acidic citrus juices with similar low pH, and the same dental-enamel and reflux considerations apply to each. Lime tends to taste sharper and more bitter, while lemon is a touch less so, but for practical purposes their acidity is comparable.

References

• Phytophotodermatitis from making sangria: a phototoxic reaction to lime and lemon juice — CMAJ, 2015, via PMC / National Library of Medicine
• Vitamin C — MedlinePlus Medical Encyclopedia — U.S. National Library of Medicine
• Detoxes and Cleanses: What You Need To Know — National Center for Complementary and Integrative Health
• Vitamin C — Health Professional Fact Sheet — NIH Office of Dietary Supplements