Testosterone in Women: What It Does, Too Much, Too Little

When most people hear the word testosterone, they picture men. But testosterone is a critical hormone in every woman's body too — produced in the ovaries and adrenal glands, circulating at far lower levels than in men, yet doing work that touches energy, mood, libido, muscle, bone and cognition. When it drifts too high or too low, women feel it.

This is a plain-English guide to what testosterone actually does in women, what goes wrong at each extreme, and why more is never the goal.

What testosterone actually does in a woman's body

Women produce roughly a tenth to a twentieth of the testosterone men do, but it is no less important. It contributes to libido and sexual response, muscle and bone maintenance, energy and motivation, mood stability, and healthy cognition. It also acts as a precursor — some of a woman's oestrogen is actually made from testosterone. So the two hormones are not rivals; they work as a balanced system, and that balance shifts naturally across the menstrual cycle and falls gradually with age.

When testosterone is too low

Levels decline slowly from a woman's twenties onward, and can drop more sharply after surgical menopause (removal of the ovaries) or with certain medications. Common signs of low testosterone in women include persistently low libido, blunted motivation or flatness, fatigue that sleep does not fix, reduced muscle tone, and a vague sense that drive has gone missing.

The tricky part: these symptoms overlap heavily with low oestrogen, thyroid problems, iron deficiency, depression and simple life stress. That is why self-diagnosis is unreliable — and why a proper assessment matters before assuming testosterone is the culprit. If several of these sound familiar, our free hormone quiz is a sensible first step.

When testosterone is too high

High testosterone in women is more common than many realise, and the signs are usually more visible: irregular or absent periods, acne, excess facial or body hair (hirsutism), scalp hair thinning, and sometimes difficulty with fertility. The single most common underlying cause is PCOS (polycystic ovary syndrome) — a hormonal and metabolic condition that often involves insulin resistance driving testosterone up. Other causes include certain adrenal conditions and, importantly, supplementation or medication.

When women misuse testosterone

This is the part that gets glossed over. Some women — often in fitness or physique circles — take testosterone or anabolic steroids to build muscle or lose fat. The short-term effects can be real. The problem is that many of the changes are partially or fully irreversible.

At doses above the natural female range, women can develop a permanently deepened voice, enlargement of the clitoris, male-pattern hair growth, scalp hair loss, acne, menstrual disruption and fertility problems — alongside the same cardiovascular and liver risks that affect men who misuse these drugs. Voice deepening in particular does not reverse when the drug is stopped. This is categorically different from carefully monitored, low-dose testosterone therapy that some doctors prescribe (for example, for persistent low libido after menopause), which aims to restore a normal female range, not exceed it.

The takeaway: balance, not maximum

Testosterone in women is a quiet, essential hormone. Too little drains libido, energy and drive; too much drives acne, unwanted hair and cycle chaos — and deliberate misuse risks permanent change. As with men, the goal is never maximum testosterone. It is the right level, in balance with your other hormones.

If your symptoms — low energy, low libido, irregular cycles, unwanted hair changes — sound like a hormone imbalance, the smart move is to get assessed rather than guess. Start with our hormone quiz, then explore more in women's hormone health.

A note on this article

This is general education, not medical advice. Testosterone symptoms overlap with many other conditions, and only a clinician with bloodwork can diagnose a hormone problem. If you are concerned, speak with your GP or a menopause or endocrine specialist.