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It plays an essential role in maintaining cellular quality and survival by eliminating dysfunctional cellular components

Delic M., Mattanovich D., and Gasser B

Its structure and biochemical profile make it useful for exploring neuroendocrine regulation, stress-response pathways, and peptide-mediated signalling mechanisms in vitro

So in answer to your question - 'is there any point in testing for iron when supplemention has taken place - well, yes (for the reasons above) especially if supplementation is sporadic

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