<<Disclaimer: Verify this information before applying it to your situation.>>

> >Wine is not safe because the yeast used in fermenting the wine may contain
> >gluten.  Best to take grape juice unless you know the brand of wine used is
> >GF.
>
> This must be a misunderstanding. The yeast that ferments wine grows
> naturally on the grapes, it is not added by the vintner. During the
> prohibition people bought grape juice, which had all its yeast bacteria
> killed by pasteurization, and made wine by adding sugar and yeast, but
> this
> is not a respectable way of making wine.

Here's my two cents worth:

It is my understanding that here in the Napa Valley all of the wineries
add yeast to the wine to stimulate fermentation.  My family owns a
winery and we add yeast, and the many wineries I've toured all mentioned
adding yeast.

I would definitely confirm with the winery that their yeasts do not
contain gluten before going ahead and drinking their wine.

Elissa in California