Non-GMO Validated Dietary Supplement Suitable for Vegetarians SoyLife? Isoflavones are unique polyphenol compounds which are found in the soybean plant. Research suggests that soy protein and soy isoflavones may reduce the frequency and severity of hot flashes during menopause. Source Naturals Genistein Soy Complex contains 40 mg of SoyLife? isoflavones per serving which are naturally occurring and come from non-GMO soy.