Comparison Of Estrogen And Progesterone

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A reason could be that the body already produces enough estrogen but now if you add progesterone it will shut off the secretion of the gonadotropins. If you were to add both estrogen and progesterone you would be adding to the estrogen. When estrogen levels are high it promotes the synthesis of more estrogen. High estrogen plus increasing progesterone cause the LH surge so this is possibly the reason as to why taking a contraceptive with just progesterone might be more affective then one with both progesterone and estrogen.
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