Does Birth Control Affect Testosterone Levels?

Most hormonal birth control methods lower testosterone levels in women, though the size and nature of the effect vary widely depending on the type of contraceptive, the specific hormones it contains, and individual biology. Combined oral contraceptives tend to produce the most dramatic drops in the testosterone your body can actually use, while progestin-only options tell a more complicated story. The relationship between birth control and testosterone touches on everything from libido to muscle growth to lab test accuracy, and the details matter more than the headline.

How Combined Oral Contraceptives Lower Testosterone

Women produce testosterone from two main sources: the ovaries and the adrenal glands. The ovaries and adrenals both contribute to circulating testosterone and its precursors, with additional testosterone formed from precursor hormones in peripheral tissues. Combined oral contraceptives (COCs) attack testosterone availability through two separate mechanisms working in tandem.

The first mechanism is suppression at the source. The estrogen and progestin components of COCs suppress the brain’s signaling hormones that tell the ovaries to produce steroids. With that signal dialed down, the ovaries release far less testosterone.¹

The second mechanism involves a protein called sex hormone-binding globulin, or SHBG. The synthetic estrogen in most pills, ethinyl estradiol, has a much stronger effect on the liver than your body’s own estrogen. One consequence is that the liver ramps up production of SHBG, a protein that binds to testosterone in the bloodstream and makes it unavailable for use by your tissues.² So even if some testosterone is still being produced, a larger share of it gets locked up and can’t do its job. The net result is that “free” testosterone, the fraction your cells can actually respond to, drops substantially. Studies commonly report free testosterone falling by around 60% in COC users.

Why the Type of Progestin Matters

Not all pills are created equal when it comes to testosterone effects. The progestin component, the synthetic version of progesterone in each pill, varies enormously in how it interacts with androgen receptors. Older progestins derived from testosterone, like levonorgestrel and norethisterone, still have some ability to activate androgen receptors. Lab comparisons have found that progestins from the first three generations display androgenic activity similar to the body’s own potent androgen, dihydrotestosterone, in receptor activation tests.³

Newer progestins were specifically designed to avoid this. Drospirenone, which derives from spironolactone rather than testosterone, and dienogest have no androgenic effect and instead possess partial anti-androgenic activity, meaning they actively block testosterone from binding to its receptors.⁴ Research confirms that drospirenone’s anti-androgenic properties are comparable to hydroxyflutamide, a well-known androgen-blocking drug, while nomegestrol acetate is even more potent.³

In practical terms, this means a pill containing drospirenone or dienogest hits testosterone from three angles simultaneously: suppressing ovarian production, increasing SHBG to mop up circulating testosterone, and blocking whatever free testosterone remains from reaching its receptors. A pill containing levonorgestrel still does the first two but partially compensates with its own androgenic kick. This distinction is why dermatologists and endocrinologists often prefer specific pill formulations for patients dealing with acne or excess hair growth.

The Patch and Vaginal Ring

Combined contraceptives delivered through the skin or vagina still contain both an estrogen and a progestin, so the basic mechanisms are the same. But the delivery route matters. When hormones bypass the digestive system and liver on their first pass, you might expect less impact on SHBG production. Interestingly, studies comparing the contraceptive patch to oral pills found that the patch actually produced a larger increase in SHBG, about 449% from baseline versus 274% for the pill. Despite this difference, free testosterone dropped by essentially the same amount in both groups, roughly 60%.⁵ The patch also produced significantly greater increases in other liver-produced binding proteins like thyroxine-binding globulin.⁶ So if you’re switching from the pill to the patch hoping for less hormonal disruption, the testosterone picture is roughly the same.

Progestin-Only Methods Tell a Different Story

Progestin-only contraceptives, which include the hormonal IUD, the implant, the injection (Depo-Provera), and the mini-pill, lack the estrogen component that drives SHBG up. This changes the testosterone equation in important ways.

The levonorgestrel IUD, which releases small amounts of progestin mostly within the uterus, serves as a useful comparison point because it has minimal systemic hormonal effects. In a large ancillary study from the ECHO randomized trial, the copper IUD (a non-hormonal control) showed essentially no change in testosterone, SHBG, or free testosterone over six months. The levonorgestrel implant, by contrast, dropped SHBG dramatically, roughly halving it, while total testosterone fell by about 23% compared to the copper IUD group. But here’s the twist: because SHBG plummeted so steeply, free testosterone actually rose by about 14% relative to the copper IUD group.⁷

An older study on levonorgestrel given orally as a progestin-only pill showed a similar pattern. Total testosterone dropped significantly, but free testosterone barely budged because SHBG fell by more than half at the same time.⁸ This is essentially the opposite of what combined pills do. Without estrogen pushing SHBG up, the progestin’s suppression of SHBG can leave more testosterone biologically available even as total levels decline.

Injectable contraceptives have their own distinct profile. DMPA (depot medroxyprogesterone acetate) reduced total testosterone by about 24% and free testosterone by about 17% over 25 weeks, while a different injectable, norethisterone enanthate, was more aggressive, cutting total testosterone by 54% and free testosterone by 40%.⁹ Both injectables also lowered SHBG substantially, but the degree of testosterone suppression apparently outpaced the SHBG decline in these cases.

The takeaway is that progestin-only methods are not interchangeable in their testosterone effects. The hormonal IUD has minimal systemic impact. The implant may actually increase the testosterone your body can use. And injectables can lower both total and free testosterone, with the magnitude depending on which drug is used.

Testosterone, Libido, and Why the Connection Is Messier Than Expected

The question many people are really asking when they wonder about birth control and testosterone is whether the pill is killing their sex drive. The hormonal logic seems straightforward: testosterone supports sexual desire in women, birth control lowers testosterone, therefore birth control should lower desire. And testosterone does appear to play a role in sexual desire, arousal, and sexual fantasies in women.¹⁰

But the research doesn’t cooperate with that neat story. A systematic review of combined oral contraceptives and sexual desire found that most COC users reported no significant change in libido, despite the measurable drops in free testosterone and rises in SHBG that studies consistently document.¹¹ Some women do experience a noticeable decline, and some women notice an improvement, potentially because the pill eliminates fear of pregnancy or reduces painful symptoms. The relevance of androgen changes for any individual woman is unclear, and some women appear to be more sensitive to testosterone fluctuations than others.¹⁰

If you’ve noticed a libido change on hormonal birth control, your experience is real. But predicting who will be affected based on testosterone numbers alone isn’t possible right now. Sexual desire involves psychology, relationship context, mood, stress, and hormonal factors beyond testosterone. The hormone shift is one variable among many.

Effects on Mood and Well-Being

The relationship between testosterone and mood in women follows a curve rather than a straight line. Research has shown that both low and high testosterone levels are associated with depression in women, with the lowest rates of depressive symptoms occurring at moderate levels of free testosterone. Levels below that window have been linked to depression, declining libido, and increases in body fat.¹²

This parabolic relationship complicates the picture for birth control users. If your natural testosterone sits comfortably in the middle of the range, a large drop from COC use could push you toward the low end where mood effects become more likely. If your natural testosterone runs high, as it does in many people with PCOS, the same drop might actually land you closer to the sweet spot. The clinical challenge is that nobody routinely measures your baseline testosterone before prescribing birth control, so the starting point is unknown.

What Happens to Muscle and Athletic Performance

Athletes and gym-goers often worry that lower testosterone from birth control will undermine their strength gains. Given how central testosterone is to muscle building in men, the concern makes intuitive sense. But the evidence to date is reassuring.

A systematic review and meta-analysis pooling data across multiple resistance training studies found that oral contraceptive use had no significant effect on muscle hypertrophy, power, or strength adaptations to training.¹³ A 12-week strength training study comparing women on and off the pill found that both groups gained similar strength and muscle thickness, with no statistically significant differences in any measured parameter.¹⁴

Even at the molecular level, the picture holds. A recent study measuring muscle protein synthesis rates in women on oral contraceptives found no difference between the active pill phase and the placebo/inactive phase. Muscle remained equally responsive to resistance exercise regardless of which phase of the pill pack the women were in.¹⁵ The researchers explicitly concluded that there was no evidence for either a muscle-building or muscle-wasting effect from the pill’s hormonal shifts.

Women’s muscle physiology responds to testosterone differently than men’s, and the testosterone levels involved in female muscle growth and maintenance operate in a range where the pill’s suppression doesn’t appear to cross a meaningful threshold. If you’re training consistently and eating adequately, the pill is unlikely to be the thing holding back your progress.

How Birth Control Complicates Lab Testing

If you’ve had testosterone measured while on hormonal birth control, the results may be misleading. Most standard lab assays for total testosterone are sensitive to SHBG concentrations. Because COCs dramatically elevate SHBG, these assays can produce artificially low readings for total testosterone that overestimate how much the biologically active fraction has actually changed. In one study, total testosterone results from a common direct immunoassay showed a strong negative correlation with SHBG levels, while results from a more precise laboratory method showed no such relationship. The researchers concluded that total testosterone measurements during oral contraceptive use are unreliable when performed with assays that are sensitive to SHBG concentration.

The practical implication is significant: if you’re being evaluated for a condition like PCOS or an androgen-producing problem, your provider ideally needs to know you’re on the pill and should either measure free testosterone directly using a reliable method or have you discontinue the pill before testing. Standard total testosterone values drawn while on COCs can mask what’s actually happening with your androgen levels.

How Long It Takes Testosterone to Bounce Back After Stopping

A prospective study in women with PCOS who stopped taking oral contraceptives found that all measured androgens and SHBG returned to their pre-pill baseline values within about eight weeks of discontinuation.¹⁶ This has practical relevance for anyone going off birth control and wondering when their body will “reset.” Two months is a reasonable expectation for hormonal normalization, though individual timelines can vary. It also matters for diagnostic purposes: if your provider wants accurate androgen levels after you stop the pill, waiting at least eight weeks before drawing blood is advisable.

When Lowering Testosterone Is the Whole Point

For people with polycystic ovary syndrome, the testosterone-lowering effect of combined oral contraceptives isn’t a side effect; it’s the reason they’re prescribed. PCOS is characterized by elevated androgen levels that can drive acne, excess facial and body hair, scalp hair thinning, and irregular periods. Combined pills address the androgen excess through all the mechanisms described earlier, and formulations with anti-androgenic progestins like drospirenone or dienogest are frequently preferred because they provide an additional layer of androgen blockade. Research confirms that total testosterone and clinical measures of excess hair growth decline while SHBG rises during COC treatment in these patients.¹

One nuance worth knowing: COCs manage the symptoms of androgen excess but don’t fix the underlying hormonal imbalance. If you stop the pill, testosterone typically climbs back to wherever it was before treatment. That’s why the eight-week recovery timeline matters so much in PCOS care, both for patients considering discontinuation and for clinicians needing accurate diagnostic bloodwork.

Birth Control and Testosterone in Transgender Men

Transgender men and other transmasculine people who are taking testosterone for gender-affirming care but still have a uterus and ovaries may need contraception if they are having vaginal intercourse. This creates an unusual pharmacological situation: one treatment is raising testosterone while the other may be lowering it or competing for similar receptor pathways. Clinical guidance acknowledges that very little is known about how estrogen- and progestin-containing contraceptive methods interact with gender-affirming testosterone therapy.¹⁷

The concern is that estrogen-containing methods could counteract the masculinizing effects of testosterone, while some progestin-only methods could either enhance or blunt them depending on the progestin’s androgenic profile. Non-hormonal options like the copper IUD avoid the issue entirely but aren’t always preferred for other reasons. Case reports emphasize the importance of providers discussing all contraceptive options and choosing methods that allow the medical transition to proceed as smoothly as possible.¹⁸ This is an area where the research is thin and clinical decisions rely heavily on individual monitoring.

How Daily Rhythm Changes on the Pill

Testosterone doesn’t stay flat throughout the day. In people not using hormonal contraception, it follows a diurnal rhythm, with levels typically peaking in the morning and declining through the afternoon and evening. Research on oral contraceptive users found that the pill lowered salivary testosterone across all times of day and flattened the daily pattern of DHEA, a testosterone precursor, during the first half of the day. Cortisol rhythms, interestingly, were unaffected. The flattening of testosterone’s daily curve may matter for researchers studying hormonal effects on behavior and cognition, and it’s a reminder that the pill doesn’t just lower your average testosterone level; it also dampens the normal fluctuations your body would otherwise cycle through.

Male Hormonal Contraception and Testosterone

The conversation about birth control and testosterone usually centers on women, but experimental male contraceptives work through a testosterone-based mechanism that is essentially the mirror image. Male hormonal contraception uses exogenous testosterone, often paired with a progestin, to exploit the same negative feedback loop that governs sperm production. By flooding the system with outside testosterone, the brain’s signaling hormones shut down, and endogenous testosterone production in the testes plummets. Because the testes need extremely high local testosterone concentrations to make sperm, this suppresses sperm counts to near zero.¹⁹

The androgen included in the regimen keeps everything else running normally. Sexual function, body composition, bone density, and other testosterone-dependent functions are maintained by the administered testosterone, so the man remains in a normal hormonal state everywhere except inside the testes.²⁰ Adding a progestin speeds up and deepens sperm suppression. These approaches remain experimental, with no product currently approved for widespread use, but multiple clinical trials are underway. The central design challenge is getting sperm counts reliably low enough in all users without side effects that drive men off the method, a problem that has stalled several otherwise promising trials over the past two decades.