For fortification, however, a 2003 review recommended zinc oxide in cereals as cheap, stable, and as easily absorbed as more expensive forms. A 2005 study found that various compounds of zinc, including oxide and sulfate, did not show statistically significant differences in absorption when added as fortificants to maize tortillas. A 1987 study found that zinc picolinate was better absorbed than zinc gluconate or zinc citrate. However, a study published in 2008 determined that zinc glycinate is the best absorbed of the four dietary supplement types available.
For fortification , however , a 2003 review recommended zinc oxide in cereals as cheap , stable , and as easily absorbed as more expensive forms . A 2005 study found that various compounds of zinc , including oxide and sulfate , did not show statistically significant differences in absorption when added as fortificants to maize tortillas . A 1987 study found that zinc picolinate was better absorbed than zinc gluconate or zinc citrate . However , a study published in 2008 determined that zinc glycinate is the best absorbed of the four dietary supplement types available .
In what product did  various compounds of zinc show little difference in absorption?
In what product did various compounds of zinc show little difference in absorption ?
maize tortillas
maize tortillas