If you've ever wondered where soy milk comes from, look no further. A Soy Cow is the source of soy milk. PETA tells you to drink soy milk because it is more humane, but in actuality, they are terribly, terribly misleading. Soy milk actually comes from soy cows. If taking regular milk from non-soy cows is cruel, then taking milk from soy cows is brutal.