aksmith:

I have never heard of any deleterious properties of juniper berries. I use these because the recipe in my cookbook calls for them. I have many recipies in many cookbooks -- mostly game recipies -- that call for juniper berries. I bought my juniper berries in a grocery store, and the juniper berries had a major brand name of spices on it. I figure that is enough assurance of safety for me. Besides, I figure smoking 4 packs of cigarettes a day, drinking two quarts of Ol' Gran Dad bourbon per day, and driving 120 MPH zig-zagging in and out of rush hour traffic will kill me before the juniper berries!!!

Seriously, I haven't heard of any dangers associated with juniper berries but am not going to worry about it until there is a warning on the spice bottle or they pull the spice form the shelves. Also, I'm not eating game with juniper berries in it all the time either.