Progestins, either alone or in combination with ethinyl estradiol (EE), are a critical
component of hormonal contraceptives. Levonorgestrel (LNG) has been extensively studied
over decades and is considered to be a safe and highly effective progestin [
[1]
]. However, the minimum threshold level of circulating LNG required for contraceptive
efficacy is still uncertain.To read this article in full you will need to make a payment
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Article info
Publication history
Published online: March 19, 2016
Accepted:
March 11,
2016
Received in revised form:
February 22,
2016
Received:
December 21,
2015
Identification
Copyright
© 2016 Elsevier Inc. All rights reserved.
