I’m not a scientist or qualified with any reliable technical knowledge about this, but I am aware that there’s a lot of plants that have chemicals in them that are identical to or closely related to the chemicals that are found in the human body.

I want to say that this is because we share some common chemistry with plants and that the mechanisms by which these hormones are created are some of the easier mechanisms for earth compatible biology to pull off.

After all, it does make sense that living creatures would adapt to eat foods that work with their bodies.