Definitions for alfacalcidol
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Alfacalcidol is an analogue of vitamin D used for supplementation in humans and as a poultry feed additive. Alfacalcidol has a weaker impact on calcium metabolism than calcitriol, while having more potent effects on parathyroid hormone levels and the immune system, including regulatory T cells. It is considered to be a more useful form of vitamin D supplementation, mostly due to much longer half-life and lower kidney load. Used as a poultry feed additive, it prevents tibial dyschondroplasia and increases phytate bioavailability.
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"alfacalcidol." Definitions.net. STANDS4 LLC, 2014. Web. 22 Dec. 2014. <http://www.definitions.net/definition/alfacalcidol>.