An interesting essay on why animal testing is insufficient-
"There are plenty of examples of substances that have appeared to be safe in animals and turned out to be toxic in humans, and vice versa. It wasn't long ago that six men in England who volunteered for an experiment to test a drug designed to treat diseases such as rheumatoid arthritis, leukemia and multiple sclerosis by dampening the body's immune reaction, ended up in hospital, some suffering permanent organ damage. Mice, rats, rabbits and monkeys had shown no ill effects at all
There are also cases of substances that cause problems in animals, but not in humans. If we used dogs as the standard animal to test food components, we could say good-bye to chocolates. This delicacy is highly poisonous to dogs! Twenty-five grams of chocolate, a quarter of a chocolate bar, can kill a dog within a few hour.
Viagra raises another interesting point. When it was tested in beagles, it caused severe stiffness. Not where it counted, but in the neck. Researchers referred to this as "beagle pain syndrome." They also found that Viagra constipated mice and caused the livers of rats to swell."
BTW, I learned how to do blue links!!!! (finally)