Seeds left from winemaking, rich in proanthocyanidins.
Retina ClearIn plain words
Grape seed extract is standardized around oligomeric proanthocyanidins (OPCs), a family of polyphenols found in seeds and skins.
Retina ClearWhat the evidence shows
Most work is in cells and animals. Small human studies on screen-related eye tiredness and diabetic eye changes are preliminary and inconsistent.
In this capsule
It is on the list without an OPC percentage, which is the number that would tell you how strong it is.
Watch-outs: Usually tolerated. It may interact with blood thinners, so tell the person who prescribes them.
Common question
What is OPC and why does it matter?
It is the active compound family. Two grape seed products can differ hugely in OPC content.