Soy. This contains phytoestrogens (estrogen-like substances from a plant). Some research has shown that soy food products can help with mild hot flashes. Other research suggests that women who have been diagnosed with estrogen-dependent breast cancer should be cautious with their soy intake. Eating large amounts of soy products could be harmful for women with this type of breast cancer.
Other sources of phytoestrogens. The active ingredients in most dietary supplements for menopause are phytoestrogens — chemicals found in plants that may act like the estrogen produced naturally in the body. These include herbs, such as black cohosh, wild yam, dong quai, and valerian root.
Bioidentical hormone therapy. Bioidentical hormones are custom-mixed formulas containing various hormones that are chemically identical to those naturally made by your body. These over-the-counter products are marketed as being tailored to a woman’s individual hormone needs. There are two main types of Bioidentical hormones:

1. Those that are FDA-approved and commercially available with a prescription
2. Those that are mixed on an individual basis for women in compounding pharmacies, which are NOT FDA-approved

It is important to know that alternative therapies can affect medical care by introducing personal belief systems that are not typically a part of the doctor-patient relationship.

Source: http://www.womenshealth.gov/menopause/treatment/