Bioavailability experiments on CACO-2 cells. Ferritin expression by cells treated with Sucrosomial® iron (SI) was significantly increased, compared to cells treated with ferrous sulfate (FS), phospholipid containing ferric pyrophosphate (Lipofer®), or micronized, dispersible ferric pyrophosphate (SunActive®) (A) or different iron salts, FS, ferric pyrophosphate (FePYR), ferrous ascorbate (FeASC), ferrous ethylene-diamine-tetra-acetate (FeEDTA), ferrous bisglycinate (FeBIS), and control (no iron) (B) (Data are mean ± SEM, * p < 0.001 SI vs. other iron compounds) (Adapted from references [41,45]).