Grapes contains resveratrol — it supposed to have a lot of healing properties, possibly treat cancer.
Resveratrol in Grape Skins Could Help Treat Cancer and More
http://articles.mercola.com/sites/articles/archive/2013/10/28/resveratrol-cancer-prevention.aspx
I don’t know about grape seeds, but here is a recent article on it:
Active component of grape seed extract effective against cancer cells
http://www.sciencedaily.com/releases/2013/12/131204181246.htm
My guess is that the 30 200 mg should be 30-200mg — it contains 30 mg of something combined with 200 mg of something else — one of which is probably grape seed extract.
Si, thanks for noting my typo. Using my iPhone today.