Leave it to pharmaceutical companies to entice people to forget about enjoying a nice glass of wine and just popping a pill instead.
Basically, white wines are produced by green grapes. Red wines by red/purple grapes, blush wines like a white zinfandel are produced by removing the skins of red grapes before fermenting the wine.
They must have tons of this stuff they aren't using. I am sure it gets resold for some purpose, but this probably could be more profitable.