Food prepared in iron cooking pots as an intervention for reducing iron deficiency anaemia in developing countries: a systematic review.
http://www.ncbi.nlm.nih.gov/pubmed/12859709
и статья про это
http://www.sciencealert.com/this-lucky-iron-fish-is-halving-instances-of-anaemia-in-cambodia
https://en.wikipedia.org/wiki/Lucky_iron_fish