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277 , E144E153 (1999)

Red blood cell (RBC) zinc may better reflect your intracellular zinc stores, but some research has shown that levels do not reliably change in response to increased zinc intake, making their usefulness debatable

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They also raise the theoretical concerns that attend any animal-tissue-derived biological product, including batch-to-batch variability and the general regulatory disfavor toward unstandardized organ extracts in Western pharmacopeias

10.1038/s41590-023-01660-5 81 GiorgiC.BaldassariF.BononiA.BonoraM.De MarchiE.MarchiS.et al (2012)