Is there any reason for a human woman to use non-human hormones?

Premarin is the prototypical example, a mixture of around 30 different compounds, some of which resemble human estrogens (estradiol, estrone, estriol), many of which do not.

What conceivable reasons could there be to use a non-human form of a hormone over the human form? There are several theoretical reasons:

--The non-human form has been shown to be superior in some way

--The non-human form is cheaper to produce, reducing the cost

--Human women prefer the non-human form


Have any of these potential reasons ever played out in real life? NO, absolutely not.

There's one reason why non-human forms of hormones may be preferred over human forms that I've not listed: Non-human forms are more profitable and/or possess greater patent protection.

Well, that might explain it all.