PubMed Studies
67
PubChem CID
About
Oligomeric proanthocyanidins act as antioxidants; strengthen capillary walls; anti-inflammatory
How it works (mechanism of action)
Used for venous insufficiency, oedema and antioxidant support. Common French pharmacy ingredient especially for vascular conditions.
📊 Effectiveness
Antioxidant
Evidence Grade B · 18 studies · n=2,200
Blood pressure
Evidence Grade B · 14 studies · n=1,600
Venous insufficiency
Evidence Grade B · 12 studies · n=1,200
Evidence grades: A=Strong RCT evidence · B=Good clinical trials · C=Limited trials · D=Preliminary/traditional
👥 Safety by Population
🚫 Contraindications & Warnings
Consult a healthcare professional before use if pregnant, breastfeeding, taking prescription medications, or if you have a medical condition. Keep out of reach of children.
🏷️ Other Names
OPC
Oligomeric proanthocyanidins
Vitis vinifera extract