In most cases natural estrogen cream is incorporated with estriols which are quickly absorbed into the body.
Phytoestrogens although from plant origin can also function much like the estrogens found in humans.
Estriol, aka E3, is one of the three major endogenous estrogens occurring naturally in the female human body.
There is a growing movement of research for sources of Natural Estrogen (mostly estriol) used in Natural Hormone replacement therapy.
Estrogen is essential in the reproductive function and cycle of a woman.