Will Falconer, DVM Moderator
Yes, understand the opinions, I myself had this fear when I started applying using Transfer Factor for my immune challenged patients. Dr. Rick Bennett straightened me out, letting me know about stimulated = balanced immune systems.
And the possibility is there that you had a bad reaction to the herb in some way, unrelated to your immune system. Herbs are really complex characters, and many have toxic potential. It's one main reason I'm a homeopath: safe medicine and no chance of toxicity from the remedies themselves.