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bulletWhat is it?
Soy isoflavones are phytochemical constituents of soybeans, a legume that has served as the basis for various foods in many Southeast Asian countries for thousands of years. The major isoflavones in soy are genistein and daidzein. Soyfoods also contain other valuable constituents, including protein, saponins, and phytosterols.
On This Page
What Is It?
Benefits and Uses
Recent Findings
Optimal intake
Safety
Benefits and uses: Genistein and daidzein have been well researched by scientists for their antioxidant and estrogenic properties. Isoflavones may reduce the risk of hormone-dependent cancers, such as breast and prostate cancer, as well as other cancers. A review study of soy research found that 65 percent of 26 animal-based cancer studies showed a protective effect of soy or soy isoflavones. Human research and population studies also suggest that soy can protect against cancer as well as heart disease. The mild estrogen activity of soy isoflavones may ease menopause symptoms for some women, without creating estrogen-related problems, and may help regulate hormone levels in premenopausal women. Soy isoflavones may also play a beneficial role in preventing osteoporosis and autoimmune conditions.
Daily requirement: There is no deficiency as such, but people who do not consume soy foods will not gain the benefits of soy.
Deficiency risk factors: Soy contains a compound called phytic acid that can interfere with mineral absorption.
Optimal intake: The ideal intake of soy is not known. Researchers suggest that the equivalent of one serving of soy foods per day supports good health, and the benefits increase as soy intake increases.
Food sources: High levels of soy-based isoflavones are found in roasted soy nuts, tofu, tempeh, soy milk, and some soy protein isolates. Other soyfoods include soy flour, miso, and soy sauce.
Recent findings: A number of new studies have confirmed anti-cancer effects, more so for genistein than daidzein. Studies have also determined that soy isoflavones can help prevent bone-loss when calcium is deficient, and they can improve blood fat and cholesterol profiles and thus reduce the risk of heart disease.
Safety: Soy products and cooked soybeans are very safe at a wide range of intakes. A small percentage of people, however, has allergies to soybeans and should, therefore, avoid soy products. Certain constituents in soy interfere with thyroid function but the clinical importance of this problem remains unclear.
What types of soy isoflavone products are available? Soyprotein powders contain isoflavones. Special soy isoflavones supplements are also available in capsules and tablets. Some provide added digestive enzymes.
 
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Opti Soy Protein - A full 25 gms of non-GMO heart healthy soy protein. Fat 1.5 gms-No Cholesterol, Carbs 1 gm. Every serving contains 25 vitamins and minerals including 100% of the RDA of Vitamin A, C, E, and Folic Acid. Rich source of naturally occurring phytosterols, saponins and the valuable isoflavones genistein and daidzein (minimum 50 mg per serving).  Excellent for vegetarian diets and cooking (contains no animal products) and aspartame free. 
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Nature's Way standardized Soy Isoflavone is a technically advanced herbal extract standardized to 40% isoflavones to provide the natural ratios of the key isoflavones in a convenient once-daily dosage.
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References
Wei, H., et al., "Antioxidant and antipromotional effects of the soybean isoflavone genistein," Proc Soc Exp Biol Med (1995), 208:124–29
Arora, A., et al., "Antioxidant activities of isoflavones and their biological metabolites in a liposomal system," Arch Biochem Biophys (1998), 356(2):133–41
Messina, M.J., et al., "Soy intake and cancer risk: a review of the in vitro and in vivo data," Nutri Cancer (1994), 21:113–31
Messina, M., "To recommend or not to recommend soy foods," J Am Diet Assoc (1994), 94(11):1253–54
Menon, L.G., et al., "Effect of isoflavones genistein and daidzein in the inhibition of lung metastasis in mice induced by B16F-10 melanoma cells," Nutr Cancer (1998), 30(1):74–77
Onazawa, M., et al., "Effects of soybean isoflavones on cell growth and apoptosis of the human prostatic cancer cell line LNCaP," Jpn J Clin Oncol (1998), 28(6):360–63
Ishida, H., et al., "Preventive effects of the plant isoflavones, daidzin and genistin, on bone loss in ovariectomized rats fed a calcium-deficienct diet," Biol Pharm Bull (1998), 21(1):62–66
Baum, J.A., et al., "Long-term intake of soy protein improves blood lipid profiles and increases mononuclear cell low-density- lipoprotein receptor messenger RNA in hypercholesterolemic, postmenopausal women," Am J Clin Nutr (1998), 68(3):545–51
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