Thanks Jotini and AoD,
Jotini- I bought grapeseed extract from Holland & Barrett in the past- do you think that would be from concord grapes?
I also asked for grape juice from the supermarket tonight so that's ashame it's not concord! will try Welch's! I just looked up Welch's website and there are lots of different juices- is it the purple grape juice that's effective?
Also is there a paper that shows that Concord grapes work but not other varieties?
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