You should not take iron and calcium together. When taken at the same time, iron and calcium bind together and significantly reduce absorption [1]. Since iron is best absorbed when taken on an empty stomach and in the presence of vitamin C, it’s recommended to take it at least 2-3 hours before or after a calcium supplement.
References
Lönnerdal B. (2010). Calcium and iron absorption--mechanisms and public health relevance. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition, 80(4-5), 293–299. https://doi.org/10.1024/0300-9831/a000036
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