Grapevine (Vitis vinifera): A naturopathic guide to circulation, antioxidants, grape seed, red vine leaf and cardiovascular health

Vitis vinifera, commonly known as the grapevine or common grape vine, is one of the world's best-known cultivated plants.

Although grapes are widely recognised as a food, different parts of the grapevine have also attracted considerable interest in herbal medicine, nutrition and modern phytotherapy.

The fruit, skin, seeds and leaves contain different combinations of biologically active plant compounds, particularly polyphenols.

These include flavonoids, anthocyanins, proanthocyanidins and stilbenes such as resveratrol.

An important distinction must therefore be made when discussing the health effects of grapevine.

Different preparations have different compositions, evidence and potential uses.

Red vine leaf has a particularly established position in European herbal medicine. The European Medicines Agency has concluded that certain grapevine leaf preparations can be used for chronic venous insufficiency, which can cause swollen legs, heaviness, pain, tiredness, itching, tension and calf cramps.

Grape seed extract, meanwhile, is particularly rich in proanthocyanidins and other polyphenols and has been investigated for cardiovascular and vascular effects.

From a naturopathic perspective, grapevine therefore represents an interesting example of how different parts of the same plant can have distinct nutritional and phytotherapeutic applications.

In this guide, you will learn:

• What Vitis vinifera is.
• Which parts of the grapevine are used.
• What grapevine naturally contains.
• What grape polyphenols are.
• What proanthocyanidins are.
• What resveratrol is.
• Red vine leaf and circulation.
• Grapevine and chronic venous insufficiency.
• Grapevine and heavy or tired legs.
• Grapevine and swollen legs.
• Grapevine and varicose veins.
• Grapevine and capillary health.
• Grape seed extract and antioxidant activity.
• Grape seed extract and blood pressure.
• Grapevine and cardiovascular health.
• Grapevine and inflammation.
• Grapevine and blood sugar.
• Grapevine and skin health.
• Grapes as food.
• The difference between grapes, grape seed extract and red vine leaf.
• Potential interactions and side effects.
• Grapevine during pregnancy and breastfeeding.
• A naturopathic approach to circulation.
• Frequently asked questions.
• Practical considerations.
• Scientific references.

What is Vitis Vinifera?

Vitis vinifera is a woody climbing plant belonging to the Vitaceae family.

It is commonly known as the common grape vine or European grapevine.

The plant has been cultivated for thousands of years for its fruit.

Grapes can be consumed fresh, dried as raisins or processed into products such as grape juice and wine.

However, several other parts of the plant have also been investigated for their phytochemical composition.

These include:

• Leaves.

• Seeds.

• Grape skins.

• Stems.

• Fruit pulp.

• Pomace.

Different parts contain different concentrations and combinations of biologically active compounds.

This is why the term "grapevine extract" should not automatically be treated as referring to one single medicinal substance.

What does grapevine naturally contain?

Vitis vinifera contains numerous naturally occurring phytochemicals.

These include:

• Polyphenols.

• Flavonoids.

• Anthocyanins.

• Proanthocyanidins.

• Catechins.

• Quercetin.

• Phenolic acids.

• Stilbenes.

• Resveratrol.

Grape seeds and skins are particularly notable sources of phenolic compounds, although their exact composition varies.

Red vine leaves also contain flavonoids and anthocyanins that contribute to their characteristic colour and biological properties.

These compounds have attracted scientific attention primarily because of their antioxidant, vascular and inflammatory effects.

What are grape polyphenols?

Polyphenols are a large family of naturally occurring compounds produced by plants.

Within the grapevine, they help protect the plant from environmental stresses and pathogens.

Grape polyphenols include several different groups, particularly flavonoids, anthocyanins, proanthocyanidins and stilbenes.

Research has investigated these compounds for their potential effects on:

• Oxidative stress.

• Vascular function.

• Inflammatory signalling.

• Cellular protection.

• Cardiovascular physiology.

However, biological activity demonstrated in laboratory experiments should not automatically be interpreted as evidence that grape polyphenols can prevent or treat disease in humans.

The strength of clinical evidence differs considerably between different preparations and health conditions.

What are Proanthocyanidins?

Proanthocyanidins are polyphenolic compounds found in several plants.

Grape seeds are particularly rich in oligomeric proanthocyanidins.

These compounds have antioxidant properties and have been investigated for their potential effects on vascular and cardiovascular health.

Many commercial grape seed extracts are standardised according to their polyphenol or proanthocyanidin content.

This means that concentrated grape seed extract can provide quantities of these compounds substantially different from those obtained by simply eating grapes.

Therefore, whole grapes and concentrated grape seed supplements should not be considered nutritionally or pharmacologically identical.

What is Resveratrol?

Resveratrol is a naturally occurring stilbene produced by grapevines.

It is particularly associated with grape skins and has received substantial scientific attention because of its antioxidant and other biological activities.

Within the plant itself, resveratrol forms part of its defence response against certain environmental stresses and pathogens.

Experimental research has investigated resveratrol in relation to inflammation, cardiovascular physiology, metabolic health, ageing and numerous other biological processes.

However, many proposed health benefits of resveratrol originate from laboratory or animal research.

The presence of resveratrol in grapes should therefore not be interpreted as evidence that grapes or resveratrol supplements can prevent or cure serious diseases.

Red vine leaf and circulation

Red vine leaf is one of the most medically relevant parts of Vitis vinifera.

The European Medicines Agency recognises grapevine leaf preparations for circulatory conditions.

Certain preparations have a well-established use for chronic venous insufficiency.

This condition occurs when veins in the legs have difficulty returning blood efficiently towards the heart.

Symptoms may include:

• Heavy legs.

• Tired legs.

• Swelling.

• Pain.

• Itching.

• Tightness.

• Calf cramps.

The EMA concluded that evidence from clinical studies supports certain standardised dry red vine leaf extracts for this purpose.

Grapevine and chronic venous insufficiency

Chronic venous insufficiency develops when the venous circulation in the legs becomes less efficient.

Blood may accumulate within the lower extremities, contributing to increased venous pressure and swelling.

Symptoms can include:

• Ankle swelling.

• Heavy legs.

• Aching.

• Tiredness.

• Itching.

• Tightness.

• Cramps.

Clinical studies evaluated by the EMA found that orally administered standardised dry red vine leaf extract can reduce oedema in people with mild-to-moderate chronic venous insufficiency and may improve microvascular blood flow.

However, not every grapevine product has been demonstrated to provide these effects.

Evidence relates to particular medicinal preparations and should not automatically be transferred to ordinary grape leaves, homemade teas or unrelated supplements.

Grapevine and heavy or tired legs

A feeling of heaviness or tiredness in the legs can have many causes.

Venous circulation problems are one possibility.

The EMA recognises traditional grapevine leaf preparations for relief of discomfort and heaviness of the legs associated with minor venous circulation problems.

However, persistent leg symptoms should not automatically be attributed to poor circulation.

Musculoskeletal problems, medication, lymphatic disorders, neurological conditions and cardiovascular or kidney disorders can also contribute to lower-limb symptoms.

Persistent or unexplained symptoms therefore require appropriate assessment.

Grapevine and swollen legs

Leg swelling, medically described as oedema, occurs when excess fluid accumulates within tissues.

Venous insufficiency is one possible cause.

Standardised red vine leaf extract has been investigated specifically for oedema associated with chronic venous insufficiency.

The EMA assessment reports reductions in oedema and improvements in microvascular blood flow with certain oral extracts.

However, swollen legs can also indicate potentially significant medical conditions.

Sudden swelling of one leg, particularly when associated with pain, warmth, redness or breathlessness, requires urgent medical assessment because conditions such as deep-vein thrombosis must be excluded.

Grapevine preparations should never be used to delay appropriate investigation of unexplained swelling.

Grapevine and varicose veins

Varicose veins are enlarged and often twisted superficial veins, commonly affecting the legs.

They can be associated with:

• Aching.

• Heaviness.

• Swelling.

• Itching.

• Skin changes.

Chronic venous insufficiency and varicose veins are closely related but are not identical conditions.

Red vine leaf preparations may help relieve some symptoms associated with chronic venous insufficiency.

However, they do not physically remove varicose veins or correct significantly damaged venous valves.

Grapevine and capillary health

Capillaries are the smallest blood vessels in the circulatory system.

Their walls allow the exchange of oxygen, nutrients and metabolic products between blood and surrounding tissues.

The EMA recognises traditional grapevine leaf preparations for symptoms associated with skin capillary fragility.

Polyphenols within grapevine have also attracted interest for their interactions with vascular tissues.

However, unexplained recurrent bruising or bleeding should not simply be interpreted as "weak capillaries."

Grape seed extract and antioxidant activity

Grape seeds contain substantial concentrations of polyphenols, particularly proanthocyanidins.

These compounds demonstrate antioxidant activity.

Oxidative stress occurs when the balance between reactive molecules and antioxidant defence mechanisms becomes disrupted.

Laboratory research suggests grape polyphenols can influence oxidative processes and cellular defence mechanisms.

However, antioxidant activity measured in laboratory experiments does not necessarily translate directly into prevention or treatment of disease.

The human body has complex endogenous antioxidant systems, and health outcomes cannot be predicted solely from the antioxidant capacity of an extract.

Grape seed extract and blood pressure

Grape seed extract has been investigated for potential effects on blood pressure.

A meta-analysis of sixteen randomised controlled trials involving 810 participants reported reductions in systolic and diastolic blood pressure, although the authors emphasised the need for larger and longer-term trials.

A later systematic review and meta-analysis involving nineteen controlled trials found a statistically significant reduction in diastolic blood pressure but not a statistically significant overall reduction in systolic blood pressure. Considerable heterogeneity existed between studies.

These findings suggest potential cardiovascular effects but do not establish grape seed extract as a replacement for antihypertensive medication.

People taking blood-pressure-lowering medication should discuss concentrated grape seed supplements with an appropriate healthcare professional.

Grapevine and cardiovascular health

Grape-derived polyphenols have been extensively investigated in cardiovascular research.

Potential mechanisms explored include effects on:

• Oxidative stress.

• Vascular function.

• Blood pressure.

• Endothelial function.

• Inflammatory pathways.

Clinical findings remain mixed.

For example, an earlier meta-analysis found modest reductions in systolic blood pressure and heart rate but no significant effects on lipid levels or C-reactive protein.

A later analysis found reductions in diastolic blood pressure and heart rate but no significant overall effect on flow-mediated dilation or systolic blood pressure.

Therefore, grape seed extract should not be described as a treatment for cardiovascular disease.

Grapevine and inflammation

Inflammation is a normal biological response to infection, tissue damage and other physiological challenges.

Polyphenols derived from Vitis vinifera have demonstrated anti-inflammatory activity in experimental research.

Resveratrol and other grape-derived compounds can interact with several cellular signalling pathways associated with inflammatory responses.

However, much of this research involves laboratory or animal models.

It would therefore be inappropriate to conclude that grapevine supplements can treat inflammatory diseases based solely on these mechanisms.

Clinical evidence must be considered separately for each condition and preparation.

Grapevine and blood sugar

Grape polyphenols have also been investigated in relation to glucose metabolism and insulin sensitivity.

Experimental studies have suggested possible antidiabetic mechanisms involving certain grape-derived compounds.

However, these findings do not mean that grapevine extracts can replace established diabetes management.

Whole grapes also naturally contain sugars.

For most people, whole grapes can form part of a balanced diet, but portion size and total carbohydrate intake may be relevant for people managing diabetes.

Concentrated extracts should be considered separately from whole fruit.

Grapevine and Skin Health

Vitis vinifera ingredients are widely used within cosmetic and dermatological formulations.

Grape seed, grape skin and other extracts contain polyphenols with antioxidant and anti-inflammatory properties.

A review of Vitis vinifera as a cosmetic raw material identified flavonoids, catechin derivatives, anthocyanins and stilbenoids among its important constituents.

Potential cosmetic applications have been investigated in relation to oxidative stress, skin ageing and pigmentation.

However, cosmetic activity should not be confused with treatment of dermatological disease.

Grapes as food

Whole grapes are foods rather than concentrated herbal extracts.

They provide:

• Water.

• Natural carbohydrates.

• Fibre.

• Vitamins and minerals.

• Various polyphenols.

Eating whole fruit also provides a complex food matrix that differs considerably from taking isolated or concentrated phytochemicals.

From a naturopathic nutritional perspective, grapes can form part of a varied diet alongside other fruits, vegetables, whole grains, legumes, nuts, seeds and appropriate protein sources.

The potential health effects of whole grapes should not be confused with the pharmacological effects investigated using concentrated grape seed or red vine leaf extracts.

Grape seed extract

Grape seed extract is produced by concentrating compounds found within grape seeds.

It is particularly associated with proanthocyanidins.

Commercial products vary in:

• Extraction method.

• Concentration.

• Polyphenol content.

• Proanthocyanidin content.

• Dose.

This makes direct comparison between supplements difficult.

Research findings from a standardised extract cannot automatically be applied to every grape seed supplement available commercially.

Red vine leaf extract

Red vine leaf extract is prepared from the leaves of Vitis vinifera.

It should be distinguished from grape seed extract.

The medicinal evidence for red vine leaf is particularly associated with venous circulation.

Certain standardised preparations have been recognised by the EMA for chronic venous insufficiency.

This does not mean that eating grapes or taking grape seed extract provides the same effect.

The plant part, extraction method and standardisation matter.

Grapevine versus Resveratrol supplements

Resveratrol is one constituent found within grapes and grapevine tissues.

A concentrated resveratrol supplement is therefore not equivalent to:

• Eating grapes.

• Drinking grape juice.

• Taking grape seed extract.

• Taking red vine leaf extract.

Each provides a different chemical profile.

This distinction is particularly important when interpreting scientific research.

Evidence involving purified resveratrol cannot automatically be used to claim that all grapevine products produce the same effects.

Grapevine and wine

Wine is produced through fermentation of grapes and contains some grape-derived polyphenols.

However, wine also contains alcohol.

The presence of polyphenols such as resveratrol does not make alcohol necessary for cardiovascular health.

People should not begin drinking wine in order to obtain grape polyphenols.

Polyphenols can be obtained from grapes and numerous other plant foods without exposure to alcohol.

Grapevine and medication interactions

Concentrated herbal extracts can have biological effects and should therefore be considered carefully alongside medication.

Particular caution may be appropriate for people using:

• Blood-pressure-lowering medication.

• Medicines affecting blood clotting.

• Multiple cardiovascular medicines.

• Diabetes medication.

The relevance depends on the specific extract, dose, medication and individual circumstances.

Whole grapes consumed as ordinary food are a different exposure from concentrated supplements.

Grapevine during pregnancy and breastfeeding

Safety depends on the preparation.

Ordinary grapes consumed as food are different from concentrated botanical extracts.

For grape seed extract specifically, NCCIH states that little is known about safety during pregnancy or breastfeeding.

Concentrated supplements should therefore not automatically be assumed safe simply because they originate from grapes.

Pregnant or breastfeeding individuals should seek appropriate professional advice before using concentrated grapevine extracts medicinally.

Grapevine in a naturopathic approach

From a naturopathic perspective, Vitis vinifera can be considered within a broader approach to vascular and metabolic wellbeing.

The appropriate preparation depends on the objective.

For example, red vine leaf is more relevant to evidence surrounding chronic venous insufficiency, whereas grape seed extract has been studied more extensively for polyphenols and cardiovascular parameters.

A naturopathic assessment may consider:

• Circulation.
• Leg swelling.
• Physical activity.
• Body weight.
• Blood pressure.
• Blood glucose.
• Cardiovascular risk.
• Medication.
• Hydration.
• Diet.
• Smoking.
• Occupational sitting or standing.
• Mobility.
• Medical history.

The objective should not simply be to recommend a plant extract.

It should be to understand why symptoms are occurring and determine whether herbal support is appropriate.

Grapevine should not replace the foundations of circulatory health

Good circulation depends on numerous physiological and lifestyle factors.

Important foundations can include:

• Regular physical activity.
• Walking.
• Avoiding prolonged immobility.
• Maintaining an appropriate body weight.
• Balanced nutrition.
• Adequate hydration.
• Smoking cessation.
• Appropriate blood-pressure management.
• Diabetes management where relevant.
• Medical treatment of significant venous disease.

For people with venous insufficiency, additional interventions such as compression therapy may be recommended depending on clinical assessment.

Grapevine preparations should therefore complement appropriate care rather than replace investigation or treatment.

Practical considerations for using Grapevine

From a naturopathic and evidence-informed perspective, consider the following:

• Identify which part of Vitis vinifera is being used.
• Do not assume red vine leaf and grape seed extract have identical effects.
• Choose standardised preparations when the evidence relates to a standardised extract.
• Follow the instructions supplied with the specific product.
• Do not replace prescribed cardiovascular medication with grapevine supplements.
• Discuss concentrated extracts with a healthcare professional if you take medication.
• Investigate persistent or unexplained leg swelling.
• Seek urgent assessment for sudden one-sided leg swelling associated with pain, warmth or redness.
• Do not assume varicose veins can be eliminated with herbal supplements.
• Remember that antioxidant activity does not automatically equal disease prevention.
• Distinguish evidence from laboratory studies from evidence in humans.
• Do not use wine as a health strategy for obtaining resveratrol.
• Consider exercise, nutrition, body weight, smoking, blood pressure and glucose control as part of cardiovascular health.
• Seek professional advice during pregnancy or breastfeeding.
• Use grapevine preparations as part of an appropriate wider health strategy rather than as a substitute for medical assessment.

Vitis vinifera is considerably more than the plant that produces grapes.

Its fruit, skin, seeds and leaves contain diverse phytochemicals, including flavonoids, anthocyanins, proanthocyanidins and stilbenes such as resveratrol.

However, one of the most important principles when evaluating grapevine is recognising that different parts of the plant are not interchangeable.

Red vine leaf has a particularly relevant place within European herbal medicine for venous circulation. The EMA recognises certain preparations for chronic venous insufficiency and traditional use for symptoms associated with minor venous circulation problems.

Grape seed extract represents a different phytotherapeutic preparation.

It is particularly rich in polyphenols and proanthocyanidins and has been investigated for cardiovascular parameters including blood pressure. Meta-analyses suggest potentially modest effects, although results vary and further high-quality research remains necessary.

Resveratrol represents another component of the grapevine story.

Its biological properties have generated extensive research interest, but experimental findings should not be transformed into claims that grapevine or resveratrol can cure cardiovascular disease, cancer, diabetes or other serious conditions.

From a naturopathic perspective, the value of grapevine lies in using the appropriate plant preparation for the appropriate purpose while maintaining realistic expectations.

For venous health, this also means considering movement, body weight, prolonged standing or sitting, cardiovascular health and appropriate medical evaluation.

For general nutritional health, whole grapes can simply form part of a varied plant-rich diet.

Grapevine therefore demonstrates an important principle of evidence-informed herbal medicine: the therapeutic potential of a plant depends not only on its name, but also on the plant part, preparation, concentration, dose and quality of clinical evidence.