Educational information, not medical advice — ask your doctor or midwife.
Wild grape is the wild form of the grapevine, Vitis vinifera subsp. sylvestris.
It is a climbing woody vine of river woods in Europe and west Asia. German sources call it Wilde Weinrebe.
It is the wild parent of every wine and table grape. The plant is now rare in the wild and protected in several European countries. Most products sold as "vine leaf" or "grape seed" come from the farmed vine, not the wild one.
Folk users took the red autumn leaves, the fruit, the seeds and the spring sap. The leaves were the main part used, mostly for tired, heavy, swollen legs.
The honest verdict: red vine leaf extract has real but modest trial support for leg swelling, and those trials used cultivated vine. Long use in tradition is not proof that a plant works, and it is not proof that it is safe.
The short answer is that the leaf extract seems to act on small blood vessels, and the rest is unproven.
Vine leaves are rich in flavonoids. In lab and animal work, these appear to make tiny blood vessels less leaky. Less leaking would mean less fluid in the tissue, which fits the leg swelling results seen in people.
In small human trials, red vine leaf extract cut leg volume and eased heaviness. So the effect on swelling is shown in people, even if the exact pathway is not settled.
Grape seed compounds called OPCs are strong antioxidants in test tubes. Antioxidant power in a dish does not tell you what happens in a body. Claims about ageing, cancer or heart disease based on this lab work are not proven.
Resveratrol, from grape skin, has a large animal literature and a thin human one. In people, the doses used in lab studies are far higher than you get from food or most capsules.
Tannins in leaf and seed bind protein. In test tubes this makes tissue firmer and slows gut secretion, which is the old reason for using leaf tea in diarrhoea. That use has not been tested properly in people.
Dried red vine leaf, loose or in teabags, is the classic European form.
Standardised red vine leaf extract in tablets or capsules is the form used in trials. Labels often name it as AS 195.
Grape seed extract capsules, sold on OPC content.
Resveratrol capsules, usually made from grape skin or Japanese knotweed.
Gels and creams for the legs, often sold with horse chestnut.
Food forms: fresh grapes, raisins, juice, wine, vinegar, grape seed oil and stuffed vine leaves.
True wild grape is almost never the source. It is scarce, protected in many places, and gathering it may be illegal.
European folk medicine used the vine for centuries, and wrote about it long before anyone measured anything.
The red leaves were gathered in autumn and brewed as a tea for heavy, aching legs and visible veins. Leaf poultices were laid on bruises and sore joints.
The watery sap that drips from a cut spring vine was called vine tears. It was dabbed on sore eyes and on skin blemishes. That use is not supported and is not advised now.
Unripe fruit juice, known as verjuice, was used for sore throats and as a cooling drink in fever. Dried fruit was given for a dry cough and as a gentle laxative.
Leaf and unripe fruit were also used for loose bowels, on the strength of their dry, astringent taste. Monastic and household herbals across Germany, France and Italy repeat these uses.
In the twentieth century German makers turned the old leaf tea into a standardised extract and tested it. That is where the modern evidence comes from.
See a doctor before you start if your legs swell, so the cause can be checked. Stop and get medical help if any of these happen.
One leg swells suddenly, or turns red, warm or painful. This can mean a clot.
You get a rash, hives, swollen lips or face, or trouble breathing.
You bruise easily, bleed from the gums or nose, or see blood in stool or urine.
You get an open sore or broken skin on the lower leg.
You feel short of breath or your chest hurts. Call emergency services for these.
Grapes, vine leaves and grape products are ordinary foods. Red vine leaf and grape seed extracts are sold as food supplements in the UK, the EU and the US, not as licensed medicines. Some German red vine leaf products are registered as traditional herbal medicines. The wild subspecies itself is rare and legally protected in parts of Europe, so picking it may be an offence.
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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