People often want, and try, to do that, but then fall back into something closer to their real self.
It's very common in video game RPGs that track moral choices. For example Mass Effect, where a lot of people try to make a Renegade character and take the evil choices. But then end up choosing many of the nicer options as they keep playing. Or have to keep reminding themselves that they're intentionally playing differently.
The vast majority is synthesized. Often from a wood byproduct.
They were probably referring to the old "it's made from beaver anuses" joke. Where in reality castoreum is extracted from an organ under skin near the tail. And is still used in very small amounts in some applications.