(CNN)Doctors have long mulled over using low doses of the hormone testosterone as a way to improve sexual function in some women, but evidence on its safety and efficacy has been somewhat lacking — until now.

A paper published in the journal The Lancet on Thursday found testosterone to be effective for postmenopausal women with low sexual desire, and the treatment was safer when administered as a skin patch or cream, rather than orally.Women's desire for sex is complicated, not strictly hormonal, study findsWomen's desire for sex is complicated, not strictly hormonal, study findsWomen's desire for sex is complicated, not strictly hormonal, study findsResearchers reviewed 46 previously published reports of 36 randomized controlled trials involving testosterone treatment that were completed between 1990 and 2018. The researchers took a close look at how testosterone affected sexual function, cognitive measures, cholesterol and other health outcomes in the trials, which included 8,480 women ages 18 to 75.The researchers wrote in the new paper that their review provides “robust support” for a clinical trial of testosterone treatment to be conducted in postmenopausal women.”Further research is needed to clarify the effects of testosterone treatment in premenopausal women and the effects on musculoskeletal and cognitive health and long-term safety,” they wrote.Read MoreThe researchers found that, compared with a placebo or another hormone treatment such as estrogen, taking testosterone for at least 12 weeks significantly increased sexual desire, pleasure, arousal, orgasm, responsiveness, self-image and the frequency of satisfactory sexual events in postmenopausal women.Does marijuana increase sexual desire?Does marijuana increase sexual desire?Does marijuana increase sexual desire?The data from those previous reports also showed that testosterone significantly reduced reported sexual concerns and distress among the women when compared with a placebo or another form of hormone treatment. As for premenopausal women, the only observed benefit in the data was a reduction in sexually associated personal distress seen in one small study.When examining the various ways testosterone could be administered, the researchers found that a significant rise in “bad” LDL cholesterol — and reductions in total cholesterol, HDL cholesterol and triglycerides — was seen when testosterone was administered orally but not as a skin patch or cream. There was also an overall increase in weight found with testosterone treatment, along with acne and hair growth, but “no serious adverse events were recorded,” the researchers found.’Not the magic bullet for everybody’The new paper had some limitations, including that much of the data on sexual function was self-reported and that the definition of sexual dysfunction was not consistent across the previously published studies.FDA approves new drug for women with low sexual desire disorderFDA approves new drug for women with low sexual desire disorderFDA approves new drug for women with low sexual desire disorder“Those of us from the sexual medicine world have been using testosterone for women off-label for a very long time, appreciating the fact that while there has been no FDA-approved testosterone for women, we have very good data to show that it is safe and it is effective in some women,” said Dr. Lauren Streicher, a clinical professor at Northwestern University’s Feinberg School of Medicine and medical director of the Northwestern Medicine Center for Sexual Medicine and Menopause in Chicago, who was not involved in the new paper.Yet testosterone is just “part of our toolbox” when it comes to treating sexual dysfunction in women, said Streicher, author of the book “Sex Rx: Hormones, Health and Your Best Sex Ever.” “Our toolbox has a lot of things in it, including talk therapy and different medications, and we welcome the idea that testosterone is going to continue to be part of our toolbox,” Streicher said. “It’s certainly not the magic bullet for everybody, and even when it does work, it’s generally in conjunction with things such as talk therapy,” she said. After all, “libido is very complicated because it is so multifactorial. So when you look at all of the things that impact libido, it’s never one thing: It’s hormones; it’s neurotransmitters; it’s relationship; it’s cultural norms; it’s past experience. The list is extremely long.”Women testify: We need "Viagra" just as much as menWomen testify: We need "Viagra" just as much as menWomen testify: We need "Viagra" just as much as menJUST WATCHEDWomen testify: We need “Viagra” just as much as menReplayMore Videos …MUST WATCH

Women testify: We need “Viagra” just as much as men 06:01In general, “there is a lot of debate among doctors” about whether adding testosterone to hormone replacement therapy for women helps them feel better and is safe, Channa Jayasena, a clinical senior lecturer at Imperial College London in England, said in a statement distributed by the Science Media Centre in the UK. He was not involved in the new paper.”Traditional” hormone replacement therapy, or HRT, containing estrogen has “well-known benefits” for improving sexual function in menopausal women, he said.”The message is that oestrogen-containing HRT should still be the treatment of choice for almost all menopausal women,” Jayasena said. “However, testosterone could be added to HRT when menopausal women have sexual symptoms which are persistent.”‘An urgent need … to ensure gender equality’More research is needed when it comes to testosterone for women, Dr. Rossella Nappi, of the IRCCS San Matteo Foundation and the University of Pavia in Italy, wrote in an editorial that accompanied the new paper.Get CNN Health's weekly newsletter

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“Many testosterone formulations are available to improve measures of sexual wellbeing including low sex drive and poor sexual function. However, currently, these compounds are available only as male formulations and their safety or adverse events, as well as their effect on general aspects of women’s health, remain controversial because of scant published data,” Nappi wrote.Notwithstanding the new paper, additional research should look into the therapeutic role of testosterone for women through studies on the benefits and risks, she wrote: “In particular, there is an urgent need in the area of sexual medicine to ensure gender equality in treating effectively those women with female sexual dysfunction.”

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