Is Prometrium a natural form of progesterone? Is it bio-identical?

Prometrium is a bio identical hormone and so is progesterone cream the only difference is that progesterone cream is absorbed directly into your blood stream and prometrium gets filtered by your liver...I've taken both and prefer the progesterone cream...its faster acting and is absorbed right into your blood stream.

Prometrium contains progesterone which is made from a starting material from a plant source and is chemically identical to progesterone of human ovarian origin. It is bioidentical.

The progesterone cream that your pharmacist has made differs from the progesterone in Prometrium in that the ingredients are not subject to the same rigorous quality assurance standards that standard commercially available hormonal preparations have to meet.

mayoclinic.com/health/bioidentical-hormones/an01133