Abstract
In Japan, insufficient calcium (Ca) intake is serious problem for health which may be associated with the high prevalence of osteoporosis among the aged. The intake of most nutrients has been sufficient, however, the Ca intake has never been sufficient. Eggshell Ca has as much as 38% of Ca and low phosphorus content. Eggshell Ca was more soluble than Ca carbonate and was as much as milk products. Eggshell Ca has been shown to exhibit higher absorptivity and availability than Ca carbonate. Furthermore, it has been reported that eggshell Ca is more effective in increasing bone mineral density in ovariectomized osteoporotic rats. These results suggest that eggshell Ca could be beneficial for bone and we propose Ca fortified foods which contain eggshell Ca as a nutraceutical.
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