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: Some '''contraceptive pills''' contain [[oestrogen]] and [[progesterone]] which [[inhibit]] the production of [[Follicle Stimulating Hormone|follicle stimulating hormone]] so that no [[ovum|ova]] will mature.
: Some '''contraceptive pills''' contain only [[progesterone]] which has fewer [[Side Effect|side effects]] than the [[mixture]] of [[oestrogen]] and [[progesterone]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f185 ''Contraceptive pill, page 216-7, GCSE Biology; Student Book, Collins, AQA '']