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Caffeine: Caffeine has a small effect on calcium absorption. It can temporarily increase calcium excretion and may modestly decrease calcium absorption, an effect easily offset by increasing calcium consumption in the diet.
both high levels of the active form of vitamin D enhance calcium absorption and high levels of estrogen enhance calcium absorption are true
jejunum
calcium
true.
No, melanin protects the skin from ultraviolet radiation. Vitamin D is synthesized in the skin and help with calcium absorption.
calcium
iron
Vitamin D
apple
Calcium
no