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

In summary of the responses I received--

St. John's Wort is an herb.  In it's pure form, it is gluten free.

When it is extracted, it can be in either a grain alcohol, or glycerin
base. It is also available in pill & capsule form.

Since we know that grain alcohol is off limits, pills can be iffy, your
best choices are either the glycerin base extract, or the dried herb
used as a tea or capsules containing only the herb (as a single
ingredient).

Celestial Seasonings makes capsules (powdered SJW) with "St. Johns Wort"
listed as the only ingredient.(Wal-Mart, Shopko)
There are other brands that are gluten free as well, check w/ the
manufacturer.

*No $ ties

~Fran
Western Oregon