As of our last update in September 2021, there is limited research on the specific benefits of sour grape juice, also known as unripe grape juice or green grape juice. Most of the available studies focus on the benefits of red and purple grape products due to their higher concentration of antioxidants like resveratrol and flavonoids.

However, sour grape juice may still offer some health benefits similar to those of ripe grape products:

1. **Antioxidants**: While not as concentrated as in ripe grapes, sour grapes also contain antioxidants that can help combat oxidative stress and reduce damage caused by free radicals in the body.

2. **Vitamins and Minerals**: Sour grape juice contains vitamins and minerals like vitamin C, vitamin K, and potassium, which are essential for various bodily functions.

3. **Digestive Health**: Sour grape juice may aid in digestion, especially if it is made from unripe grapes that still have high levels of pectin, which can be beneficial for gut health.

4. **Hydration**: Like any fruit juice, sour grape juice can contribute to your daily fluid intake, helping to keep you hydrated.

5. **Potential Anti-Inflammatory Effects**: Some studies suggest that compounds found in grapes may have anti-inflammatory properties, which could potentially benefit overall health.

Keep in mind that the majority of research has been conducted on ripe grapes and grape products, so more studies are needed to determine the specific health benefits of sour grape juice. Additionally, fruit juices, including sour grape juice, contain natural sugars, so it's essential to consume them in moderation to avoid excessive sugar intake. As with any dietary changes or additions, it's always a good idea to consult with a healthcare professional or a registered dietitian for personalized advice.

Sour grape juice can be a versatile ingredient in cooking and can add a unique flavor to a variety of dishes. Here are a few ways you can use sour grape juice in your culinary creations:

1. **Marinades:** Sour grape juice can be used as a base for marinades for meat, poultry, or even tofu. The acidity in the juice helps tenderize the protein and imparts a tangy flavor. Combine the sour grape juice with some olive oil, herbs, garlic, and other seasonings of your choice for a delicious marinade.

2. **Sauces:** Sour grape juice can be reduced and used to make a flavorful sauce for savory dishes. For example, you can reduce the juice with some sugar or honey, add some spices like cinnamon or cloves, and create a sweet and tangy sauce that pairs well with grilled meats, roasted vegetables, or even desserts like cheesecake.

3. **Vinaigrettes:** Sour grape juice can be a unique and tasty addition to salad dressings and vinaigrettes. Mix it with olive oil, Dijon mustard, a bit of honey or agave syrup, and some herbs for a refreshing dressing for your salads.

4. **Beverages:** Sour grape juice can be used to make refreshing beverages like mocktails or spritzers. Mix it with sparkling water, a splash of lemon or lime juice, and some fresh mint leaves for a delightful and non-alcoholic drink.

5. **Baking:** Sour grape juice can be used in certain baking recipes that call for acidic ingredients, such as certain cakes, muffins, or even certain sauces used in desserts.

6. **Jelly and Preserves:** Sour grape juice can be used to make delicious jellies and preserves. The natural acidity in the juice helps with the preservation process and gives the spreads a tangy flavor.

However, keep in mind that the specific type of sour grape juice you have may vary in intensity and sweetness, so it's a good idea to taste it first to determine how it might work in different dishes. Additionally, if a recipe calls for grape juice, you may need to adjust the sweetness or tartness in the dish depending on the variety of grape juice you're using.