From 2004 this pharmacokinetic study examined Fe absorption of micronized, dispersible ferric pyrophosphate with that of ferrous sulfate in an infant cereal and a yogurt drink. While absorption was not different between the two forms, the bioavailability of SunActive was high indicating it may be better for iron fortification.
Fidler, M. C., Walczyk, T., Davidsson, L., Zeder, C., Sakaguchi, N., Juneja, L. R., & Hurrell, R. F. (2004). A micronised, dispersible ferric pyrophosphate with high relative bioavailability in man. The British journal of nutrition, 91(1), 107–112. https://doi.org/10.1079/bjn20041018