They're not related but they share one important characteristic: soy isoflavone and resveratrol both contain phytochemicals, or plant-based chemicals, that provide health benefits. Soybeans contain isoflavones called phytoestrogens. Resveratrol and soy isoflavones affect the hormone estrogen in the body, but in different ways. Both phytochemicals are also being studied for other health benefits.
Soy Isoflavone Benefits
Research studies produce mixed results, but soy isoflavones may help lower cholesterol levels, prevent the growth of hormone-related cancers such as breast and prostate cancer, reduce the risk of osteoporosis and decrease symptoms of menopause. The studies that show a reduction in cholesterol indicate that soy isoflavones may lower total cholesterol by 7 percent to 9 percent if you eat 31 g to 47 g of soy protein daily, according to the University of Maryland Medical Center.
Resveratrol Benefits
Studies available as of May 2011 involved laboratory cultures and animals, so little is known about how resveratrol affects people, according to the Linus Pauling Institute. In lab studies, it performs as an antioxidant, reduces cholesterol, helps slow the growth of cancer and may inhibit processes leading to stroke or atherosclerosis. Like soy isoflavone, resveratrol affects estrogen in the body. However, under different circumstances, it may either increase or decrease estrogenic activity.
Sources
Resveratrol is found in grape skins, red wine, purple grape juice, peanuts, blueberries and cranberries. Soy isoflavones may be obtained from any soy product, including soybeans, miso, tempeh, soy milk and tofu. The Linus Pauling Institute notes that the isoflavone content of soy foods often varies significantly among brands, but the highest concentration is generally found in miso, boiled or roasted soybeans and tempeh. Resveratrol and soy isoflavone supplements are also available.
Considerations
Women with a history of estrogen-sensitive cancers, such as breast, ovarian and uterine cancers, should not consume any phytoestrogens until they talk to their health-care provider. Neither resveratrol or soy isoflavones have been studied for their safety in women who are pregnant or breast feeding. Soy isoflavones may increase your risk of hypothyroidism. Always consult your physician before taking phytochemicals if you're on prescription medications. Soy isoflavones may interfere with tamoxifen, and resveratrol may increase the risk of bleeding if you take warfarin, clopidogrel or dipyridamole.
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