After four months, while the two other groups did not improve in any measure, the multi-vitamin fortification group had large increases in aerobic capacity and whole-body endurance.
To test endurance, kids ran continuously between two points, 66 feet apart, at increasing speed. The multi-vitamin group also improved in blood levels of iron, vitamin C, and the active forms of vitamins B1, B2, B3, B6, B9, and B12.