Animals equipped with poison usually provide superior gall-bladders, though you have to be extremely careful with the injection because of the poison. Since the old times, the gall-bladder of bear and wild boar was frequently used, but nowadays it is hard to find one. Ox bezoar is the gallstone of a sick ox. You can buy ox bezoar at local butchery, but you have to be careful about distinguishing fakes from originals. Rounded bezoar is expensive, easy to fake, and easy to be fooled.
Granule shapes are long with holes.
These are less expensive, hard to fake, and, most of all, more effective as an injection. Ox bezoar injection is very mild, and there are no side efffects even if you inject in overdoses. The recipe of ox bezoar injection is same as that of the garlic injection which will be explained later. You can either make it combined with garlic, or make it separately. Store the finished injection in freezer and dilute whenever you need it.