The chemicals and medicines we test on animals reacts differently on every species. In fact, it has been proven that no two species even metabolize any given drug in the same way. Results gained from animal testing can be incorrect and misleading. In many cases, not only are the results wrong, but the opposite can be true for humans; a drug may cure a disease in lab animals but have an adverse effect when used in treating people for the same symptoms. Thus, such research is not only irrelevant when applied to humans, but can also be dangerous by providing a false sense of security. Only the study of human patients will ultimately lead to valid research.
Vivisection reduces sentient beings to the status of tools, to be used for the benefit of others and disposed of. Animal testing is also incomprehensibly cruel, which cannot be justified by the results gained through its use, no matter how valuable. Furthermore, the tests done on animals are seldom of any real benefit; results are almost characteristically useless or even misleading when applied to humans. There is no excuse to perpetuate the cruelty we submit our animal subjects to. Continuing such experimentation has no point and is completely