Grapeskin extract: What It Is, Benefits, Dosage, and Sources

Grapeskin extract is a concentrated form of the compounds found in the outer layer of grapes. It's primarily recognized for its rich content of polyphenols, particularly anthocyanins and resveratrol, which are responsible for the color of red and purple grapes and are associated with various biological activities. Unlike grapeseed extract, which comes from the seed, grapeskin extract focuses on the compounds present in the skin itself. This article examines what grapeskin extract is, its potential benefits, typical dosages, and where it can be found.

Grape Skin Extract: An Overview

Grapeskin extract is derived from the skins of grapes, most commonly Vitis vinifera varieties, which include common wine grapes. The extraction process typically involves crushing the grapes, separating the skins, and then using solvents (like water or ethanol) to draw out the desired compounds. The resulting liquid is then concentrated and often dried into a powder form for use in supplements, food colorings, and other applications.

The primary components of interest in grapeskin extract are its polyphenols. These are plant compounds known for their antioxidant properties. Among these, anthocyanins are particularly prominent, giving red and purple grapes, and consequently their skins and extracts, their distinctive hues. Resveratrol, another well-known polyphenol, is also present in grapeskin, though often in smaller quantities compared to some other polyphenols.

The practical implications of understanding what grapeskin extract is extend to its diverse uses. In the food industry, it serves as a natural food coloring agent, often labeled as "enocyanin." Beyond coloring, its concentrated polyphenol profile makes it a subject of interest in dietary supplements aimed at supporting various aspects of health.

Consider the difference between a whole grape and grapeskin extract. A whole grape offers fiber, water, and a broader spectrum of nutrients in addition to the polyphenols in its skin. Grapeskin extract, by contrast, provides a highly concentrated dose of specific phytochemicals, often with the intent of maximizing the intake of these particular compounds for their potential health effects. This concentration can be beneficial for those looking to target specific pathways associated with these compounds, but it also means lacking the combined benefit of the whole fruit's nutritional matrix.

Health Effects of Grape Skin Extracts and Their Components

The health effects associated with grapeskin extracts largely stem from their rich polyphenol content. These compounds are studied for their antioxidant, anti-inflammatory, and potentially cardioprotective properties. It’s important to distinguish between the effects of whole grapes, grape juice, grapeseed extract, and grapeskin extract, as each can have a different profile of active compounds and concentrations.

Antioxidant Activity

Polyphenols, including anthocyanins and resveratrol found in grapeskin extract, are potent antioxidants. They help neutralize free radicals in the body, which are unstable molecules that can cause oxidative stress and cellular damage. Oxidative stress is implicated in the aging process and the development of various chronic conditions. By mitigating oxidative stress, grapeskin extract may play a role in cellular protection.

Anti-inflammatory Potential

Chronic inflammation is another factor in many long-term health issues. Some research suggests that the compounds in grapeskin extract may exhibit anti-inflammatory effects by modulating inflammatory pathways in the body. This is an area of ongoing research, with laboratory and animal studies showing promising results, though human studies are still exploring the extent and significance of these effects.

Cardiovascular Health

The potential benefits of grapeskin extract for cardiovascular health are frequently discussed. This is often linked to the "French paradox," where populations consuming diets rich in red wine (and thus grapeskin-derived compounds) appear to have lower rates of heart disease despite other dietary factors. Components like resveratrol and various flavonoids in grapeskin are thought to support cardiovascular function by potentially:

• Improving blood vessel function: Helping to maintain the elasticity of blood vessels.
• Supporting healthy blood pressure: Though this effect is typically modest and part of a broader healthy lifestyle.
• Reducing oxidative damage to LDL cholesterol: Which is a factor in plaque buildup in arteries.

Comparison of Grape-Derived Extracts

To clarify the distinct focus of grapeskin extract, a comparison with other common grape-derived products can be helpful:

This table illustrates that while all are grape-derived, grapeskin extract offers a unique profile, particularly in its anthocyanin content, which sets it apart from grapeseed extract's proanthocyanidins or isolated resveratrol supplements.

Health Benefits and Uses of Red Grape Skin

The red varieties of grapes are particularly valued for their skins due to their high concentration of anthocyanins, the pigments responsible for their vibrant red, purple, and blue colors. Beyond their aesthetic appeal as natural colorants, these compounds, along with other polyphenols present in red grape skin, contribute to a range of potential health benefits.

Skin Health and Anti-Aging

The antioxidant properties of grapeskin extract are often highlighted in discussions about skin health. Oxidative stress from UV radiation and environmental pollutants can contribute to premature skin aging, characterized by fine lines, wrinkles, and loss of elasticity. By combating free radicals, grapeskin extract may help protect skin cells from this damage. Some cosmetic formulations incorporate grapeskin extracts for their antioxidant and anti-inflammatory properties, aiming to support skin vitality. However, topical application may have different effects than ingestion, and strong clinical evidence for significant anti-aging effects from supplements is still developing.

Cognitive Function

Preliminary research, primarily in animal models and in vitro studies, suggests a potential link between polyphenols, including those found in grapeskin extract, and cognitive function. These compounds may support brain health by reducing oxidative stress and inflammation in neural tissues, and by potentially improving blood flow to the brain. While intriguing, more human clinical trials are necessary to confirm these effects and understand their practical implications for cognitive health in humans.

Vision Support

Anthocyanins, abundant in red grapeskin, are also found in other dark-colored berries like blueberries and bilberries, which are often associated with vision support. These compounds are thought to contribute to eye health by protecting retinal cells from oxidative damage and potentially improving night vision and adaptation to darkness. While the evidence is stronger for other anthocyanin-rich berries, the presence of these compounds in grapeskin extract suggests a similar potential, warranting further investigation.

Natural Food Coloring (Enocyanin)

One of the most established and widespread uses of grapeskin extract is as a natural food coloring, often referred to by its E-number E163 or as "enocyanin." This application leverages the stable, vibrant colors provided by anthocyanins. It's used in a variety of food and beverage products, including:

• Yogurts
• Jams and jellies
• Fruit preparations
• Confectionery
• Beverages (juices, soft drinks)
• Some dairy products

The use of grapeskin extract as a food coloring is driven by consumer demand for natural ingredients and a move away from artificial dyes. Its safety profile is generally considered good, making it a preferred choice for many food manufacturers.

Grape Skin Extracts: Benefits and Use

The diverse array of polyphenols in grapeskin extract contributes to its broad spectrum of potential benefits and applications. While many benefits are still under investigation, the existing body of knowledge points to several areas where grapeskin extract is being explored.

Blood Sugar Regulation

Some studies suggest that polyphenols in grapeskin extract may influence glucose metabolism. This could involve mechanisms such as improving insulin sensitivity, reducing glucose absorption in the gut, or protecting pancreatic cells from oxidative damage. These findings are primarily from animal and in vitro studies, and human research is needed to determine if grapeskin extract can play a significant role in managing blood sugar levels, particularly for individuals with metabolic conditions. It is not a substitute for conventional treatments for diabetes or other blood sugar disorders.

Gut Microbiome Health

Emerging research highlights the connection between dietary polyphenols and gut health. Polyphenols are often poorly absorbed in the upper digestive tract, allowing them to reach the colon where they can interact with the gut microbiota. This interaction can lead to the production of beneficial metabolites and may influence the composition of the gut microbiome, potentially promoting a healthier gut environment. A balanced gut microbiome is increasingly linked to overall health, including immune function and metabolic health.

Athletic Performance and Recovery

The anti-inflammatory and antioxidant properties of grapeskin extract have led to interest in its potential role in athletic performance and recovery. Intense exercise can induce oxidative stress and inflammation, which may contribute to muscle fatigue and delayed recovery. Some theories suggest that supplementation with polyphenols could help reduce exercise-induced cellular damage and inflammation, potentially aiding in faster recovery and improved performance. However, human studies in this area are still limited and often yield mixed results.

Culinary and Beverage Applications (Beyond Coloring)

While primarily known as a food coloring, grapeskin extract is also being explored for its functional properties in food and beverages. For example, some functional food products or specialized beverages might include grapeskin extract not just for color, but also for its antioxidant profile, aiming to create a "healthier" or "fortified" product. Its slight astringency and flavor profile, though subtle in highly refined extracts, can also be considered in certain formulations.

Regulatory Status: 21 CFR 73.170 -- Grape skin extract (enocianina)

The regulatory status of grapeskin extract is an important aspect, particularly concerning its use in food and dietary supplements. In the United States, the Food and Drug Administration (FDA) regulates food additives and color additives.

Under 21 CFR 73.170, "Grape skin extract (enocianina)" is listed as a color additive exempt from certification. This means that it is approved for use as a color additive in certain foods and beverages without requiring batch-by-batch certification by the FDA, provided it meets specific purity and identity specifications.

Key points from this regulation generally include:

• Identity: The regulation specifies that grape skin extract is obtained by the aqueous extraction of the pigment from the pomace (the solid remains of grapes after pressing for juice or wine) of grapes (Vitis vinifera L.).
• Purity Specifications: It must meet certain purity criteria, including limits on heavy metals and other impurities, to ensure its safety for consumption.
• Permitted Uses: The regulation outlines the specific foods and beverages where grapeskin extract can be used as a color additive. These typically include beverages, confectioneries, dairy products, and other food items, often with limitations on the maximum amount that can be added.
• Labeling: When used as a color additive, it must be declared on the food label by its common name "grape skin extract" or "enocyanin."

This regulatory framework allows for the widespread use of grapeskin extract as a natural coloring agent in the food industry, providing a clear guideline for manufacturers and assurances of safety for consumers. For dietary supplements containing grapeskin extract, the regulatory pathway is different, falling under the regulations for dietary ingredients, which generally require that the ingredient be safe and that the manufacturer substantiate any claims made about the supplement.

The Benefits of Grape Skin Extract: A Summary

The potential benefits of grapeskin extract are multifaceted, primarily stemming from its rich concentration of polyphenols like anthocyanins and resveratrol. These compounds collectively offer a range of biological activities that are of interest for human health.

Key Benefits

• Antioxidant Support: Grapeskin extract is a powerful source of antioxidants, which help protect the body's cells from damage caused by free radicals. This can contribute to overall cellular health and may play a role in slowing aspects of aging.
• Anti-Inflammatory Properties: The polyphenols in grapeskin extract are observed to have anti-inflammatory effects, potentially helping to modulate the body's inflammatory responses. Chronic inflammation is a factor in many health conditions, so this property is significant.
• Cardiovascular Health: Research suggests that grapeskin extract may support heart health by contributing to healthy blood vessel function and offering protection against oxidative stress relevant to cardiovascular disease.
• Natural Food Coloring: Beyond its health-related benefits, grapeskin extract is a widely used and FDA-approved natural food coloring agent (enocyanin), providing vibrant red and purple hues to various food and beverage products.
• Potential for Skin and Cognitive Health: While more research is needed, early studies indicate potential roles for grapeskin extract in supporting skin vitality and cognitive function, mainly through its antioxidant and anti-inflammatory mechanisms.
• Metabolic and Gut Health (Emerging Research): There's growing interest in how grapeskin extract might influence blood sugar regulation and positively interact with the gut microbiome, though these areas require further strong human studies.

Dosage and Sources

Dosage: There is no universally established recommended daily allowance (RDA) for grapeskin extract, as it is not an essential nutrient. Dosages in supplements can vary widely, typically ranging from 100 mg to 500 mg per day, and sometimes higher depending on the concentration of active compounds (e.g. standardized to a certain percentage of polyphenols or anthocyanins).

• Important Note: The appropriate dosage can depend on the specific formulation, the concentration of active compounds, and the intended use. It's crucial to follow the manufacturer's recommendations on supplement labels and, ideally, consult with a healthcare professional before starting any new supplement, especially if you have existing health conditions or are taking other medications. Self-prescribing high doses without professional guidance is not recommended.

Natural Sources:

The most direct natural source of grapeskin extract compounds is, of course, grapes themselves, particularly red and purple varieties.

• Whole Grapes: Eating whole grapes provides the full spectrum of nutrients, including the polyphenols in the skin, fiber, and vitamins.
• Red Wine: Red wine contains compounds extracted from grape skins during fermentation. However, the alcohol content and potential negative health effects of excessive alcohol consumption must be considered.
• Grape Juice (from red/purple grapes): Juices made from whole grapes, including the skins, will contain some of these beneficial compounds, though often in lower concentrations than an extract.
• Dietary Supplements: These are the most concentrated source for those seeking higher doses of grapeskin extract. They are available in various forms, such as capsules, powders, and liquids. When choosing a supplement, look for products from reputable manufacturers that provide information on the standardization of their extract (e.g. "standardized to 20% anthocyanins").

Potential Side Effects

Grapeskin extract is generally considered safe when consumed in typical dietary amounts or as directed on reputable supplements. However, potential side effects can occur, particularly with higher doses or in sensitive individuals:

• Digestive Upset: Some people may experience mild digestive issues like stomach upset, nausea, or diarrhea.
• Allergic Reactions: Individuals with grape allergies should avoid grapeskin extract. Symptoms can include rash, itching, or swelling.
• Blood Thinning: Due to the potential for some grape compounds to have mild blood-thinning effects, individuals on anticoagulant medications (blood thinners) or those with bleeding disorders should exercise caution and consult a healthcare professional before using grapeskin extract supplements.
• Interactions with Medications: Grapeskin extract, like many supplements, could potentially interact with certain medications. It's always advisable to discuss supplement use with a doctor or pharmacist to avoid adverse interactions.

FAQ

What is grape skin extract used for?

Grape skin extract is primarily used for its potential health benefits, stemming from its rich antioxidant and anti-inflammatory polyphenol content. These include supporting cardiovascular health, providing antioxidant protection against cellular damage, and potentially contributing to skin and cognitive health. Additionally, it is widely used as a natural food coloring agent (enocyanin) in the food and beverage industry due to the vibrant pigments (anthocyanins) found in red and purple grape skins.

Who should not take grapeseed extract?

While the question specifically asks about grapeseed extract, it's important to clarify that grapeskin extract and grapeseed extract are distinct, though both come from grapes.

For grapeseed extract, individuals who should generally exercise caution or avoid it include:

• People on blood-thinning medications (anticoagulants): Grapeseed extract may have mild blood-thinning effects, potentially increasing the risk of bleeding.
• Individuals with bleeding disorders: For the same reason as above.
• Those undergoing surgery: It's often recommended to stop taking grapeseed extract at least two weeks before surgery to minimize bleeding risk.
• People with grape allergies: As it's derived from grapes.
• Pregnant or breastfeeding women: Due to insufficient research on safety in these populations, it's generally advised to avoid use.
• Children: Lack of sufficient research on safety and appropriate dosing.

For grapeskin extract, similar precautions apply, particularly regarding blood-thinning potential and allergies, due to shared compounds and origin. Always consult a healthcare professional before starting any new supplement.

What's the grapeseed trick for wrinkles?

The "grapeseed trick for wrinkles" typically refers to the use of grapeseed oil or grapeseed extract in skincare products or as a dietary supplement. Grapeseed oil is rich in linoleic acid and vitamin E, which are beneficial for skin hydration and barrier function. Grapeseed extract, with its high concentration of proanthocyanidins (powerful antioxidants), is believed to help protect skin from oxidative damage that contributes to aging and wrinkles.

The "trick" isn't a miraculous overnight fix, but rather the consistent application of grapeseed oil or products containing grapeseed extract, combined with a healthy lifestyle. The idea is that the antioxidants help neutralize free radicals that break down collagen and elastin, thus potentially maintaining skin elasticity and reducing the appearance of wrinkles over time. However, scientific evidence for dramatic wrinkle reduction from either topical or oral grapeseed products alone is not extensive, and results can vary widely. It's often part of a broader skincare regimen rather than a standalone solution.

Conclusion

Grapeskin extract offers a concentrated source of beneficial polyphenols, primarily anthocyanins and resveratrol, derived from the outer layer of grapes. Its appeal lies in its potential antioxidant and anti-inflammatory properties, which are being explored for their roles in cardiovascular health, skin vitality, and even cognitive function. Beyond its use in dietary supplements, grapeskin extract is a well-established and FDA-approved natural food coloring agent, providing a safe alternative to synthetic dyes.

While promising, it's important to approach claims about grapeskin extract with a balanced perspective. Much of the research is still evolving, and results from in vitro or animal studies do not always translate directly to humans. For those considering grapeskin extract as a supplement, understanding its potential benefits, typical dosages, and possible side effects, along with consulting a healthcare professional, is a prudent next step. As a natural component of grapes, it contributes to the overall health benefits associated with consuming these fruits, offering a targeted approach to harnessing some of their most active compounds.