Chelates

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1. A chemical formulation in which a metal atom (very often a micronutrient such as iron) is bound with an organic component to improve the overall uptake of the micronutrient.

porphine.gif

This image shows a chemical compound composed of a metal ion and a chelating agent.
Source: http://scifun.chem.wisc.edu/chemweek/Chelates/Chelates.html