Red and purple grapes owe much of their nutritional interest to polyphenolic compounds such as resveratrol, anthocyanins, and proanthocyanidins, which are concentrated in the skins and seeds. Research suggests that regular consumption of red and purple grapes or their juice may support cardiovascular health by helping to maintain healthy blood pressure, improving endothelial function, and reducing markers of oxidative stress. Studies also indicate potential benefits for cognitive function, with some evidence pointing to improved memory and attention in older adults, as well as protective effects on eye health related to the antioxidant activity of grape-derived flavonoids. While findings are promising across these areas, much of the research is still evolving, and whole grapes or minimally processed grape juice remain the most commonly studied forms.
Compare this supplementThese are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Extract | 250–500 mg | Daily | anti-inflammatory effects | Based on clinical trials using polyphenol-rich grape extract standardized for OPCs |
| Extract | 150–300 mg | Daily | antioxidant support and general health | Common in clinical trials using standardized grape seed or grape skin extract |
| Extract | 200–400 mg | Daily | blood pressure regulation | Based on RCTs examining grape seed extract effects on cardiovascular markers |
| Extract | 200–300 mg | Daily | cognitive function | Based on RCTs examining grape polyphenols and memory in older adults |
| Extract | 100–250 mg | Daily | eye health and oxidative stress reduction | Common in trials using grape seed extract for visual fatigue and retinal protection |
| Powder | 5–10 g | Daily | antioxidant and metabolic support | Used in studies utilizing whole grape powder supplementation |