Wild strawberry

What is Wild strawberry?

Wild strawberry is a small, low plant of the rose family. It grows all over Scandinavia on forest edges, meadows, banks and old road verges. The berries are tiny, deep red and very strongly scented.

The berry is an ordinary food, not a drug. The dried leaves, and sometimes the roots, were brewed as a folk tea in Nordic homes. Dried leaf tea is still sold today.

Here is the honest verdict. There is almost no human evidence that wild strawberry leaf or berry treats any illness. Long traditional use is not proof that it works, and it is not proof that it is safe.

As food, the berry suits most people. The main real risk is allergy, which is common enough to take seriously. Everything else on this page should be read as tradition, not as medicine.

How does Wild strawberry work?

No one has shown how wild strawberry works in people. The trials have not been done.

The leaves are rich in tannins, which taste drying in the mouth. In test tubes, tannins bind to proteins and tighten surface tissue. That is the likely reason folk healers used leaf tea for loose stools and sore mouths.

Lab tests show that leaf and berry extracts mop up free radicals (unstable molecules that can damage cells). Some cell and animal work suggests they calm inflammation. Whether any of that happens in your body is not known.

The folk idea that the tea is a water pill has not been tested in people. Nothing in the plant is known to act like a prescription diuretic (water pill).

One effect is plain and real. The fresh berries carry vitamin C, and vitamin C is a nutrient your body needs. That is nutrition, not a drug action.

What forms does Wild strawberry come in?

You will meet wild strawberry in these forms: - Fresh berries, picked or bought, eaten as food - Jam, syrup, juice and dried berries - Dried leaf, loose or in tea bags - Leaf as one part of a mixed herbal tea - Tincture (an alcohol extract) of the leaf, less common - Root decoction (a boiled root brew), mostly historical - Berry extract in skin creams and lip balms

Two points about the leaf are worth knowing. Leaf sold for tea should be fully dry and smell clean. Half-wilted leaves can grow mould, so they should not be brewed.

Garden strawberry (Fragaria x ananassa) is a different, larger species. Most published research uses the garden type, not the wild one.

Where it comes from:

Wild strawberry was one of the best-loved wild foods of the Nordic countries. Children threaded the berries onto grass stalks, the Swedish smultronstra.

Folk healers in Sweden, Norway and Finland dried the leaf and brewed it as tea. They gave it for loose stools, sore mouths and as a mild water pill. The root was boiled for much the same reasons.

Carl von Linne, the Swedish botanist, wrote that eating strawberries eased his gout. That was one man's account of his own body, not a study.

The berries also carried meaning beyond health. They were a summer treat tied to midsummer, and a sign of good forest ground.

In lean war years, dried leaf was used to stretch scarce black tea. None of this history tells you whether the plant treats anything.

What does Wild strawberry help with?

• Mild, short-lived diarrhoea (leaf tea): This is the main Nordic folk use of the leaf. Healers brewed dried leaf for loose stools in adults and older children. The idea rests on tannins, which tighten tissue in test tubes. No human trial has tested wild strawberry leaf for diarrhoea. Fluids and salts are what actually matter in diarrhoea. Tea is not a substitute for rehydration or for medical care.
• Sore mouth, gums or throat (leaf tea as a rinse): Cooled leaf tea was swilled or gargled for mouth sores and raw gums. The drying, tannin-rich taste is the basis of the claim. There is no human trial behind it. Any comfort may come simply from a warm or cool rinse. See a dentist or doctor for mouth sores that last more than two weeks.
• Gout and joint aches (historic claim): Linne's note about strawberries easing his gout is the famous source. It spread widely in Nordic and wider European writing. There is no controlled trial of wild strawberry for gout. Gout is driven by uric acid, and strawberries have not been shown to lower it in people. Gout is treatable with proven medicines. Do not swap them for fruit or tea.
• Fluid retention and 'cleansing' (folk water-pill claim): Leaf tea was drunk in spring as a cleansing brew. Some accounts say it made people pass more water. Any drink can raise urine output simply because it is fluid. No study shows that this plant acts as a diuretic in people. Swelling in the legs or belly can signal heart, kidney or liver trouble. That needs a doctor, not a tea.
• Vitamin C in the diet: This one is real, and it is food, not medicine. Fresh wild strawberries are a decent source of vitamin C. Vitamin C prevents and treats scurvy, a disease of severe vitamin C lack. Wild berries were one summer source of it in old Nordic diets. A mixed diet with fruit and vegetables covers this for nearly everyone today.

Which foods are rich in Wild strawberry?

1. Fresh wild strawberries
2. Garden strawberries
3. Strawberry jam and syrup
4. Dried wild strawberry leaf tea
5. Mixed Nordic forest berry blends

Practical Tips:

Wild strawberry is a food first and a folk remedy second.

Fresh berries hold the most vitamin C. Jam and syrup add a lot of sugar and lose much of that vitamin in cooking.

If you pick your own, rinse the berries and pick away from busy roads and sprayed fields.

What are the side effects of Wild strawberry?

• Itchy lips, mouth or throat (oral allergy, common in people allergic to birch pollen)
• Hives, rash or swelling
• Rare but serious whole-body allergic reaction
• Nausea or stomach ache from strong leaf tea
• Constipation if you drink a lot of tannin-rich tea
• Less iron absorbed when tea is drunk with meals
• Loose stools or wind from eating a very large amount of berries

Good to know:

Most people eat wild strawberries with no trouble at all.

Allergy is the one real risk, and it is well documented. In Nordic countries it often shows up as an itchy mouth in people allergic to birch pollen. A severe whole-body reaction is rare, but it does happen.

Leaf tea side effects are usually mild and come from the tannins. Nausea and constipation are the ones people report most.

How much Wild strawberry should you take?

• Recommended daily: The berries are food. Eat them as you would any fruit. Dried leaf tea labels in Europe usually give about 1 to 2 grams of leaf per cup. Many suggest up to about three cups a day. That is what a label carries. It is not advice for you, and it is not a tested dose. No amount of leaf or berry has been shown to treat anything. Ask a pharmacist or doctor before you use the tea as a remedy.
• Best time of day: Time of day does not matter for the berries or the tea. One timing point is worth knowing. If you take iron tablets, keep tannin-rich tea a couple of hours away from them.
• With or without food: Berries go with or without food, as you like. Strong leaf tea sits better with or after a meal. On an empty stomach, tannins can cause mild nausea in some people. If your meal is your main iron source, drink the tea at another time.
• Time to effect: Be honest with yourself here: it may do nothing. Folk accounts say an astringent tea settles loose stools within a day. No trial supports that, so treat it as unproven. A mouth rinse either feels soothing straight away or it does not. Vitamin C from the berries is absorbed within hours, but you will not feel it happen.
• How long to take it: Folk use of the leaf tea was short. People drank it for a few days while a problem lasted, not all year. There is no safety data on drinking strong leaf tea daily for months. Tannin-heavy teas can cut iron uptake over time. Diarrhoea that runs past two days in an adult needs a doctor. In a young child or an older person, get help sooner.