Hi Rita - I'm taking this with a grain of salt, because I LOVE garlic, and of course I do know the nutrionalist's point of view that garlic is healthy and good for you.
Doug Graham says in the 80/10/10 diet that "Herbs and spices like garlic, onion, curry, cumin, ginger, cayenne, chili powder and oregano contain alkaloids and other toxic chemicals. These seasonings stimulate our taste buds and nerves while delivering toxins to out nervous system. Their use should be avoided, or at least minimzed. They act as irritants in the digestive tract, often causing the body to produce mucus for protection. They also function to disguise the bland or noxious taste of cooked foods and seduce us into consuming foods that would not attract us on their own." Graham, D. (2006). "The 80/10/10 Diet". p256
I've read on Harley's posts too that garlic has been called an exitotoxin.
Before anyone shoots me down; I'm just saying that these points of view exist. I do not necessarily subscribe to them.

All I've noticed is that since going predominantly raw, raw garlic gives me the worst indigestion I've ever experienced. It really hurts! I am wondering what anyone else might be experiencing with raw garlic. This pain used to happen to me when I was a teenager (and presumably less backlogged with toxic sludge!!LOLOL!!!!) when I ate raw garlic.
It's food for thought; if raw garlic gives me pain, then maybe there might be something in it that is toxic TO ME???
Best cheers, Niqi