Beastmilk was founded in 2010 by Mat McNerney, Johan Snell, Valtteri Arino and Paile in Helsinki, Finland.
The band name came about because McNerney and Snell read White Stains by Aleister Crowley, and wanted to have a dialogue about what it means to be a man and go through all these male emotions.
It was sort of a conversation on what is your father’s milk, what is your mother’s milk and so on.[better source needed]
It also came out of Snell's interest in liquids and how it affects society. The band later self-released a demo, White Stains on Black Tape, in the same year.
The demo was well received including from musicians Fenriz of Darkthrone and Nate Newton of Converge.
On April 2, 2012, Beastmilk released an EP Use Your Deluge under Finnish label Svart Records. On June 2013, the band went to Salem, Massachusetts to record their debut full-length Climax, with Converge guitarist Kurt Ballou at his own recording studio GodCity Studio. Climax was released on November 29, 2013 under the Magic Bullet Records label.