Testosterone plays a surprisingly central role in women’s health, influencing everything from sexual desire to mood, skin, and hair growth. Women produce far less testosterone than men, with normal levels staying below 40 ng/dL in adults compared to several hundred in men. But even at these lower concentrations, the hormone shapes how women feel, look, and function on a daily basis.
Where Testosterone Comes From in Women
Women produce testosterone in the ovaries and adrenal glands. A significant portion of it gets converted into estradiol, the primary form of estrogen, through a process called aromatization. This makes testosterone not just a hormone in its own right but also a raw ingredient for estrogen production. The balance between testosterone and its conversion to estrogen matters: when too much conversion happens, excess estrogen can raise the risk of certain gynecological conditions.
Testosterone levels fluctuate throughout a woman’s life. They peak during the reproductive years and gradually decline with age, though this drop is less dramatic than the estrogen crash that happens at menopause. Normal total testosterone for adult women is generally below 40 ng/dL, though labs vary in how they measure and report results.
Sexual Desire and Arousal
The most well-established role of testosterone in women is its effect on sexual function. It contributes to sexual desire, arousal, and the physical maturation of genital tissues. Research consistently identifies androgens like testosterone as significant independent factors affecting sexual desire, sexual activity, and satisfaction.
That said, the relationship isn’t as simple as “low testosterone equals low libido.” No single testosterone level reliably predicts whether a woman will have sexual difficulties, even though women with persistently low desire often have lower testosterone. The connection is real but individual. Some women with low testosterone levels have perfectly healthy sex drives, while others with levels in the normal range experience problems.
For postmenopausal women diagnosed with hypoactive sexual desire disorder (HSDD), low-dose testosterone therapy has shown moderate benefit in randomized, placebo-controlled trials. An international panel of experts concluded in a global consensus statement that HSDD is the only evidence-based reason to prescribe testosterone to women. There is not enough data to support prescribing it for any other symptom or condition.
Mood, Energy, and Mental Health
Testosterone’s relationship to mood in women follows a U-shaped curve. Both low and high levels are associated with depression. Research has identified a sweet spot for free testosterone (roughly 0.4 to 0.6 ng/mL in plasma) where depressive symptoms are at their lowest. Below that range, women are more likely to experience low mood, fatigue, and reduced sense of well-being. Above it, the hormone can fuel irritability, aggression, and in some cases contribute to major depressive disorder.
This parabolic pattern helps explain why testosterone’s reputation as a mood booster is only half the story. In studies of women experiencing age-related declines in androgens, transdermal testosterone application did substantially improve mood and psychological well-being compared to placebo. But other research has found that too much testosterone worsens mood. The dose and context matter enormously.
Interestingly, depression in pubertal girls correlates more strongly with rising testosterone levels than with the environmental and social factors often blamed for teenage emotional volatility. This suggests the hormone’s mood effects begin early and aren’t limited to midlife or menopause.
Skin, Hair, and Physical Appearance
Testosterone drives several visible changes in women’s bodies, particularly through its effects on hair follicles and oil glands. Sebaceous glands, which produce the oil that conditions skin and hair, are sensitive to androgens. When testosterone or its more potent derivative is elevated, these glands can go into overdrive, leading to oily skin and acne.
Hair growth follows a paradoxical pattern with testosterone. On the body, higher levels stimulate thicker, darker hair on the upper lip, chin, chest, abdomen, and back. On the scalp, the opposite can happen. An enzyme converts testosterone into a more potent form that shrinks hair follicles over repeated growth cycles. The normal hair growth phase, which typically lasts about three years, can shorten to as little as six weeks to three months. The result is thinner, shorter, lighter hairs that eventually become barely visible. The normal ratio of growing to resting hair shifts from about 9:1 down to 2:1.
What Happens When Levels Are Too High
Excess testosterone in women, known as hyperandrogenism, affects roughly 5% to 10% of women of reproductive age. The most common cause is polycystic ovary syndrome (PCOS). Symptoms include acne and oily skin, excess body hair in typically male patterns, irregular or absent periods, thinning hair on the scalp, and difficulty getting pregnant.
Mildly elevated total testosterone is typical in PCOS. Highly elevated levels, on the other hand, can signal something more serious like an ovarian tumor and warrant prompt investigation. Diagnosis usually involves blood tests measuring total testosterone alongside a physical exam looking for visible signs of androgen excess.
Beyond the physical symptoms, high testosterone can affect behavior and emotional regulation. Women with elevated levels report more aggression and, in some cases, antisocial tendencies that can strain relationships and contribute to depression through social isolation.
Testosterone Therapy for Women
No testosterone product is FDA-approved for use in women in the United States. When doctors prescribe it for HSDD, they do so off-label, typically using male-formulated products at roughly one-tenth the male dose. For example, a testosterone gel tube designed for men contains 50 mg; a woman’s starting dose would be about 5 mg, applied to the back of the calf, upper thigh, or buttock.
Only transdermal forms (gels and creams) are recommended. Injections, implanted pellets, and oral testosterone are discouraged because they can push levels well above the normal female range, increasing the risk of side effects. Compounded testosterone products, which are custom-mixed by specialty pharmacies and heavily marketed to women, lack the safety and efficacy data to support their use.
The most common side effects of testosterone therapy in women are mild: increased facial or body hair and acne. Long-term safety data beyond a few years do not yet exist, which is why guidelines emphasize keeping doses low enough to maintain testosterone within the normal premenopausal range. Regular blood monitoring is part of the process.
Despite widespread claims, testosterone therapy is not currently recommended for improving bone density, building muscle, reducing body fat, sharpening cognition, or treating depression in women. While low testosterone does correlate with some of these issues, clinical trials have not shown that supplementing it reliably fixes them.