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The following doses have been studied in scientific research:
ADULTS: BY MOUTH:
- For type 2 diabetes:
- Touchi extract 300 mg three times daily for 3-6 months. Touchi is a traditional Chinese food prepared from soybeans.
- Fibrous soy hulls 26 grams daily for 4 weeks. Single doses of soy fiber 7-10 grams have also been used.
- 30 grams of soy protein, containing 132 mg of phytoestrogens, daily for up to 12 weeks.
- For diabetes during pregnancy: Protein 0.8 grams/kg daily for 6 weeks, consisting of 35% soy protein as textured soy protein (Sobhan), 35% animal protein, and 30% other plant proteins.
- For high cholesterol: 20-50 grams per day of soy protein.
- For high blood pressure: 18-66 grams of soy protein, containing 34-143 mg of isoflavones, daily for up to 12 weeks has been used. Also, 4.5 grams of black soy peptide daily for 8 weeks has also been used.
- For irritable bowel syndrome (IBS): Soy containing 40 mg isoflavones daily for 6 weeks has been used.
- For long-term kidney disease (chronic kidney disease or CKD): a diet limited to 700-800 mg/kg soy protein daily has been used.
- For menopausal symptoms such as hot flashes:
- 15-60 grams per day of soy protein providing 34-80 mg isoflavones.
- concentrated soy isoflavone extracts providing 35-200 mg/day of isoflavones.
- Genistein, a soy isoflavone: 54 mg per day.
- For menopausal symptoms such as depression: 100 mg of soy containing 50 mg of isoflavones has been used along with sertraline 50 mg daily.
- To reduce body weight during menopause: Soy isoflavones <100 mg daily for up to 6 months have been used.
- For metabolic syndrome. 30 grams of soy nuts per day as part of a diet high in fruit and vegetables for 8 weeks has been used.
- For weak bones (osteoporosis): 40 grams per day soy protein containing 2-2.25 mg isoflavones per gram has been used for 3-6 months to prevent osteoporosis. Soy extract 1 gram containing 80 mg of isoflavones has been used for one year.
CHILDREN:
BY MOUTH:
- For diarrhea: Soy fiber-fortified formula containing 18-20 grams of soy protein per liter has been used in infants.
Soy foods contain variable amounts of isoflavones. Soy flour contains 2.6 mg isoflavones per gram of soy flour, fermented soybeans contain 1.3 mg per gram, boiled soybeans contain 0.6 mg per gram, soymilk contains 0.4 mg per gram, soybean curd contains 0.5 mg per gram, fried soybean curd contains 0.7 mg per gram, soybean paste contains 0.4 mg per gram, and soy sauce contains 0.016 mg per gram.
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