Precursors (sterols) to progesterone and estrogen are found in wild yams and soy but the human body does not have the ability to convert these sterols to hormones. Through a simple process (hydrolysis) these chemicals are converted into progesterone, estrogen and testosterone capable of being processed by the body. They are considered "natural" because they are derived from a natural plant (organic) source and are structurally identical to the hormones biologically made in the body.

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