Helps Reduce the Frequency of Hot Flashes Associated with Menopause Non-GMO Soy Source Naturals Eternal Woman™ is a revolutionary line designed so that menopausal women may experience the Freedom to Change™ naturally. Source Naturals Hot Flash® formula may help minimize the body’s often dramatic response to declining levels of estrogen. Hot Flash formula includes non-GMO soy isoflavones, which clinical research has shown may reduce the frequency and severity of hot flashes.