research The injectable contraceptives depot medroxyprogesterone acetate and norethisterone enanthate substantially and differentially decrease testosterone and sex hormone binding globulin levels: A secondary study from the WHICH randomized clinical trial
In this study, researchers reported that both progestin-only injectable contraceptives, DMPA-IM and NET-EN, significantly decreased serum testosterone and SHBG levels among HIV-negative women in South Africa, yet this did not explain prior findings of no reduction in risky sexual behavior or sexual function.

