Vitamin A consumption becomes harmful above specific quantitative thresholds relative to the RDI
Evidence from multiple experimental studies confirms that excessive vitamin A consumption above recommended intake levels results in toxicity, metabolic disruption, and adverse physiological effects.
The claim asserts that vitamin A consumption becomes harmful above specific quantitative thresholds relative to the RDI. Papers [1], [9], and [11] provide empirical evidence using animal models demonstrating that supraphysiological doses or excessive intake of vitamin A lead to toxicity and negative metabolic or physiological impacts, supporting the core premise that high thresholds of vitamin A are harmful.
Excessive vitamin A consumption above recommended intake levels causes toxicity and physiological disruption in animal models.
Phiri CB, Davis CR, Grahn M, Gannon BM, Kokinos BP, Crenshaw TD, Tanumihardjo SA. Vitamin D Maintains Growth and Bone Mineral Density against a Background of Severe Vitamin A Deficiency and Moderate Toxicity in a Swine Model.. 2024. https://doi.org/10.3390/nu16132037
Paper [1] demonstrates that excessive vitamin A intake leads to moderate toxicity and altered physiological parameters in an animal model.
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Hartcopff PFP, Lins A, de Araujo DB, Barbosa GB, de Souza LV, Hamoy MKO, Eiró-Quirino L, de Lima SMA, Muto NA, Lopes DCF, Hamoy M. Supraphysiological Doses of Vitamin A Promote Changes in Hippocampal Oscillation Bands and Cardiac Activity in Wistar Rats.. 2026. https://doi.org/10.1021/acsomega.6c01082
Paper [9] shows that supraphysiological doses of vitamin A disrupt neurocardiac and electrophysiological homeostasis in rats.
Berthomé A, Antoine T, Meiller L, Govers R, Guichard P, Sabran C, Gonzalez T, Nowicki M, Bordat C, Borel P, Grino M, Sauvinet V, Reboul E. Perinatal vitamin A excess impacts vitamin A and lipid metabolism in rat offspring.. 2025. https://doi.org/10.1038/s41598-025-18896-w
Paper [11] establishes that vitamin A overexposure during perinatal development detrimentally impacts lipid and vitamin A metabolism.
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