Does grape juice require a hechsher?

[moew]

Does grape juice require a hechsher? Are they all pasteurized before anyone can touch it?

[ralph.lasry]

Kirkland grape juice

My apologies that your question has not been answered in a timely manner. It seems to have somehow fallen between the cracks. I’d like to take the opportunity to answer all you’re questions point by point. You ask if the Rav position is that most grape juice is cooked? That is correct but absolutely does NOT mean that All in fact are. Moreover there may be ample time to touch the juice prior to its cooking process. Therefore plainly put all grape juice needs supervision or the precise knowle…