The level of minerals is also good. The average ash content is 3 percent. Tef is reported rich in iron, calcium, potassium, and phosphorus. The iron and calcium contents (11-33 mg and 100-150 mg, respectively) are higher than those of wheat, barley, or sorghum. In Ethiopia, an absence of anemia seems to correlate with the levels of tef consumption and is presumed to be due to the grain's high content of iron.
However, some samples of tef have failed to show the extraordinary levels of iron. Part of the iron may well come from dust and dirt that clings almost uncannily to these tiny grains. Washed seeds have shown a level of iron of about 6 mg, much less than the reported figures but still a remarkable amount.