Background: Combined oral contraceptives comprise of the steroid hormone oestrogen in combination witha progesterone, occupied principally to prevent pregnancy. Combined oral contraceptive pills commonlyrefer to pills in which an oestrogen and a progestogen are given concurrently in a monthly cycle. Materialsand methods: The current study was undertaken over a period of six months from 2019/10/1 till 2020/3/1in Al-Najaf province. Thirty women that take oral contraceptives pill participated in the study, Their agesranged from (20-38) years divided into three groups(10/group) according to the ages (20-25, 26-31,32 -38)years. Results: Results of this study revealed, oral contraceptives pill cause no effect on serum levels ofcalcium in women that intake it at different age groups in compare with controls groups, and also causes asignificant decrease in serum levels of vitamin D in women that intake it at different age groups in comparewith controls groups. On the other hand, the results obtained there aren’t apparent difference in theseparameters when compared between age groups and group that use it for long period (3,6 and 9 year).Conclusion: The present study concluded that oral contraceptives pill cause no effect on serum levels ofcalcium in women and little effect on vitamin D in women.
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