Actually, Colloidal Silver mutes the body's immune response to poison ivy. The urushinol is harmless to the body; it is the inflammation from the immune system that is so uncomfortable. So try Colloidal Silver topically for relief.
By the way, visit http://www.naturalnews.com
for lots of natural health info. They also have streaming radio, videos, podcasts, and a weekly telecon featuring a holistic doctor or other health advocate. All free!
If you would like a chance to ask health questions directly, Ron Schneider, a nobel-prize nominated immuno-enzymologist, holds free telecons each Wednesday evening where he passionately dispenses information about how to face health challenges without drugs. The phone number is listed on his site, http://www.enrichinggifts.com.