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Six of the major soy-based infant formulas marketed in the United States were assayed for their isoflavone levels. Samples were taken from the east coast, midwestern, and west coast regions of the United States. Isoflavone levels were variable across brands probably due to different amounts of soy isolate used in product formulation. Total isoflavones ranged from 214 to 285 μg/g of dry formula or ≈25−30 μg/mL of reconstituted formula.
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Murphy et al. (1997) studied this question.
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