Women also produce testosterone, and it falls by half between ages 20 and 45. The drop shows up as low sexual desire, low drive, training with no response and dimmed vitality. Per the international consensus, replacement has a well-established indication only for hypoactive desire after menopause, everything else is investigating the cause.
Almost every conversation about testosterone is about men, but the hormone is female too: produced in the ovaries and adrenals, it takes part in a woman's desire, motivation, muscle and bone. And it plummets in silence: from age 20 to 45, levels fall by about half, with no visible milestone like periods stopping.
In Reactiva's libido form, 92% of respondents were women, averaging 43 years old. And the symptoms they marked alongside falling desire tell the complete story: anxiety or irritability and bloating with abdominal weight gain (71% each), fatigue and low mood (68%), lack of focus and poor memory (53%).
How the drop shows up
- •Low sexual desire, the most direct symptom: testosterone talks to dopamine, the circuit of motivation and reward. Without it, desire does not "break", it dims out.
- •Low mood and fading initiative, which many women describe as "I lost my life force" and get an antidepressant in return.
- •Training with no response and falling strength, because the hormone takes part in female muscle building too.
- •Everything mixed with the transition: in perimenopause, estrogen, progesterone and testosterone fall together, and separating their contributions takes evaluation, not guesswork.
What the guidelines say, without embellishment
The global consensus on female testosterone is honest about what is known: the only well-established indication for replacement is hypoactive sexual desire disorder after menopause, at a physiological female level and with follow-up. For "energy", "focus" or weight loss, the evidence does not support prescribing, and a masculinizing level charges dearly: acne, hair loss, voice changes, and risks that do not reverse.
What to do then
Measure and interpret as a whole: total testosterone, SHBG, estradiol and progesterone according to the phase, prolactin, TSH and free T4, ferritin. And investigate what knocks the hormone down from outside: chronic stress cortisol, bad sleep, aggressive food restriction and some birth control pills, which reduce the hormone's free fraction. Often desire returns by treating the cause, without replacing anything.
Dr. Diego Rios · CRM-PI 8347 (Brazilian medical license)
Creator of the Reactiva Method. Five postgraduate degrees: Family Medicine, Endocrinology and Metabolism, Nutrology, Sports Pharmacology and General Ultrasonography.
The answer is not one more isolated lab test. It is reading the system.
Medicine is one. The body does not divide itself into specialties: the model does. When each symptom goes to a different office and each doctor sees one piece, you spend years circling between referrals, holding reports and missing answers. In that back-and-forth, you lose time and health.
Precise diagnosis and treatment come from the opposite path: understanding everything and going deep into one patient. Sleep, hormones, weight, energy and mind interpreted together, because that is how the body works.
Dr. Diego Rios, CRM-PI 8347
Educational content. It does not replace individual medical evaluation and is not a prescription. Patient care is provided in Portuguese.