Estrogen replacement therapy can help to reduce hair thinning that has been caused by an estrogen deficiency, alopecia, or by the onset of menopause. Products that contain animal or synthetic estrogen may also aid in restoring the growth of hair already lost as a result of hormonal deficiencies or an immune disease, such as alopecia, according to Dr. Loren Pickart, a biochemist in Bellevue, Washington.

On the Other: It is Not Effective for All Types of Hair Loss

Estrogen cannot fully restore the hair of those who have suffered more severe hair loss, according to Dr. Pickart. Additionally, estrogen treatments and estrogen replacement therapy will not help to restore hair in cases in which the cause of hair loss is not related to hormonal issues. Thus for many men, hair loss caused by aging will not be restored by estrogen.

Bottom Line

In general estrogen treatments are effective for hair restoration for women who have experienced hair loss or thinning as a result of alopecia, menopause, or hormonal deficiencies. However, while estrogen can restore hair, the relative effectiveness of estrogen used to replace and restore hair loss and thinning will vary widely across individuals based on numerous factors including genetics and lifestyle.

Source:

SkinBiology.com: Estrogen and Hair Growth