why worry about animal testing?

Help me find the mistake(s) in my reasoning in this argument that we consumers shouldn't be worried about animal testing.

(1) A corporation would never sell something that
would be harmful to consumers. (premise)
(2) If a product isn't harmful to humans, then it's
not harmful to animals. (premise)
(3) We can consume only products that a corporation
makes available. (obvious)
(4) We cannot consume a product that is harmful
to animals. (1, 2, 3)
(conclusion) We consumers shouldn't be worried
about animal testing. (4)