Make them from scratch, like other compounds.

Since proteins are made of amino acids, I'm gonna say, yes. . .Virginia, there is a need for protein. (though probably not as much as most of us eat. )  And, in reality, there are other protein sources than red meat. In fact, even things like apples have small amounts of protein.

Also, lest this post be too serious. . . When I say "essential,"  I mean like actually essential. . .not the way the doterra people use it.