Parathyroid hormone, oral absorption

Stable Strontium. Few studies were located regarding endocrine effects in humans after oral exposure to stable strontium. Vezzoli et al. (1998) reported that strontium absorption was inversely correlated with parathyroid hormone levels. 

The precise mechanism and the localization of the absorption for orally taken aluminum are not known so far. It is assumed, however, that the aluminum is absorbed in the stomach and the duodenum, possibly in the proximal jejunum as well. The absorbed amount depends on the solubility of the aluminum compound and the respective gastrointestinal pH level. In addition, iron and fluorine increase the enteral absorption. Furthermore, the aluminum intake might be influenced by the parathyroid hormone and vitamin D. The daily aluminum intake via nutrition depends on eating habits and is estimated at an average of 5-10 mg/day less than 1% of this amount is absorbed. 

The amount of aluminum absorbed from the gastrointestinal tract may be dependent on certain factors. For example. Mayor et ai 56,57 report that increased parathyroid hormone treatment causes increased intestinal aluminum absorption and higher brain aluminum concentrations in rats given oral aluminum. They also observed that parathyroid hormone withdrawal in rats resulted in a rapid decrease of brain aluminum concentration independent of dietary aluminum. Those authors suggest that reduced parathyroid hormone aids in reducing brain aluminum accumulation, and that both Alzheimers disease and dialysis encephalopa-... 

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