hours of each other. Thus, people taking both calcium and thyroxine run the risk of inadequate thyroid hormone replacement and thence hypothyroidism if they take them simultaneously or near-simultaneously, because significant amount of T4 is adsorbed to calcium carbonate depending on gastric pH levels, preventing absorption of T4 at the intestinal level.

Absorption

Calcium absorption in the gut is influenced by factors such as vitamin D levels, gut acidity, age, estrogen levels, and dietary

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