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Double-Fortified Salt Is Efficacious in Improving Indicators of Iron Deficiency in Female Indian Tea Pickers

This double blind, randomized control trial in India demonstrated that double-fortified salt is an efficacious approach to improving iron status and should be further evaluated for effectiveness in the general population. 

Jere D. Haas, J.D., Rahn, M., Venkatramanan, S. et al. The Journal of Nutrition. (April 2014) Vol. 144 No. 6, pp. 957-964.