In brief: OPC is a collective term for oligomeric proanthocyanidins, often derived from grape seeds. Antioxidant activity in the laboratory is not the same as clinical benefit.
What do human studies show?
| Outcome | Interpretation |
|---|---|
| Blood pressure | Small reductions in meta-analyses |
| Blood lipids | Mixed results |
| CRP | No clear effect |
| Anti-ageing | Not established |
Meta-analyses of randomised trials show small blood-pressure effects but do not support broad heart-health or anti-ageing claims.[1]
Safety
People using blood-pressure medicines or anticoagulants should discuss supplementation professionally.
FAQ
Is OPC vitamin C?
No.
Does OPC reliably lower blood pressure?
Not in everyone.
Is grape seed extract the same as grape juice?
No.
Does OPC slow ageing?
Not established.
Conclusion
OPC is interesting, but small effects on individual markers are not proof of comprehensive health protection.
