Vitis vinifera

Grape leaves have long been a staple of folk medicine in the Mediterranean basin. According to Dioscorides (1st century CE), the leaves were ground into a paste and applied as a poultice to treat minor wounds and skin irritations, a practice that was later echoed by Pliny the Elder (1st century CE) who recommended a decoction of the same leaves to soothe stomach upset and relieve mild diarrhea. In more recent ethnobotanical surveys, Bennett et al. (2021) recorded that the people of the Canary Islands still brew a light tea from fresh grape leaves to aid digestion after heavy meals and to calm an upset stomach. These three independent sources—ancient Greek, Roman, and contemporary Canary Island—confirm that grape leaf infusions and poultices are a well‑documented tradition across diverse cultures.

A simple, safe preparation is a mild grape‑leaf tea that can be made at home. Take 5–7 fresh grape leaves (or 1 Tbsp of dried leaves) and place them in a cup. Pour 250 ml of boiling water over the leaves, cover, and let steep for 10 minutes. Strain and sip warm. This tea is generally well tolerated; however, people with known grape allergies should avoid it, and pregnant women should consult a healthcare provider before regular use. The tea can be enjoyed up to three cups per day, but it is best kept to a moderate amount to avoid excessive tannin intake.

The therapeutic effects of grape leaves are largely attributed to their rich phytochemical profile. Key constituents include flavonoids such as quercetin and catechins, which possess anti‑inflammatory and antioxidant properties; tannins, which provide astringent activity useful for wound healing; and resveratrol, a stilbene that contributes to the antioxidant capacity of the leaves. In grape seeds, proanthocyanidins and higher concentrations of resveratrol are found, explaining the use of seed extracts in modern supplements for cardiovascular health and skin care.

Today, grape‑leaf extract is marketed as a natural remedy for digestive discomfort, and grape‑seed extract is widely available as a dietary supplement aimed at supporting heart health and skin elasticity. Ongoing research continues to explore the antioxidant and anti‑inflammatory potential of these compounds, underscoring the relevance of this ancient plant in contemporary health practices.

Common products
- Grape juice, wine, and raisins are produced from the fruit of *Vitis vinifera*.
- Grape seed oil is extracted from the seeds and used in food, cosmetics, and industrial applications.
- Grape seed meal, a by‑product of oil extraction, is used as animal feed.

Industrial and craft applications
- Grape seed oil serves as a base oil in cosmetics, providing emollient properties and a neutral scent.
- The oil’s high unsaturation and oxidative stability make it suitable for industrial lubricants.
- Grape seed oil is a feedstock for biodiesel production via transesterification.
- Grape seed meal, rich in protein and fiber, is incorporated into livestock diets.

Food and beverages (non‑medicinal)
- Grape juice is consumed as a beverage.
- Wine is produced by fermenting grape juice.
- Raisins are dried grapes sold as a snack.
- Grape seed oil is used in cooking and salad dressings due to its high smoke point (~225 °C) and neutral flavor.

Fragrance and cosmetics
- Grape seed oil is used in skin‑care products for its emollient properties and mild fragrance.

Properties relevant to use
- Grape seed oil contains ~70 % linoleic acid, low saturated fat, and a high smoke point, supporting its use in cooking, lubricants, and biodiesel.
- Grape seed meal has a protein content of 20–25 % and significant fiber, making it suitable for animal feed.

Standards and regulation
- Food‑grade grape seed oil must comply with FDA Food Code and EU Regulation (EC) No 258/2000 for edible oils.
- Cosmetic grape seed oil is regulated under EU Cosmetics Regulation (EC) No 1223/2009 and follows ISO 22716 good manufacturing practice.
- Biodiesel derived from grape seed oil must meet ASTM D6751 and EN 14214 specifications.

Sustainability and sourcing
- Grape seed oil is a by‑product of the wine industry, reducing waste and improving resource efficiency.
- Sustainable sourcing often involves using seeds from organic vineyards and waste streams.
- Life‑cycle assessments indicate lower greenhouse‑gas emissions for grape seed oil compared with conventional vegetable oils.

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