Six of the major soy-based infant formulas marketed in the United Stat
es were assayed for their isoflavone levels. Samples were taken from t
he east coast, midwestern, and west coast regions of the United States
. Isoflavone levels were variable across brands probably due to differ
ent amounts of soy isolate used in product formulation. Total isoflavo
nes ranged from 214 to 285 mu g/g of dry formula or approximate to 25-
30 mu g/mL of reconstituted formula.