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- The main food source is soybeans and related products including tofu, soymilk, and miso (a fermented soy product used in soups)

- Preparation of the soy may be important, because the amount of isoflavonoids present may vary. Some extractions (particularly when alcohol is used) to make supplements may have very little active isoflavonoid present

- Other food sources include whole grains and legumes, but the amounts are minimal compared to soy products