Anti-Müllerian Hormone
Also known as: AMH
What Does Anti-Müllerian Hormone Measure?
Anti-Müllerian Hormone (AMH) is a protein hormone produced by specialized cells in the ovaries called granulosa cells, which surround developing egg follicles. In women, AMH levels directly reflect the size of the remaining egg supply, known as the ovarian reserve. Because AMH is secreted continuously by small, growing follicles regardless of the menstrual cycle phase, it provides a stable and reliable snapshot of how many eggs a woman has left at any given time. Unlike other hormones tied to fertility, AMH levels remain relatively consistent throughout the month, making it one of the most practical markers for assessing reproductive potential.
Why Does Anti-Müllerian Hormone Matter?
AMH is one of the most clinically important markers for women planning a family or undergoing fertility evaluation. Declining AMH levels are a natural part of aging, but unusually low levels for a woman's age can signal diminished ovarian reserve, which may reduce the chances of natural conception and affect how a woman responds to fertility treatments like IVF. Conversely, abnormally high AMH levels may indicate polycystic ovary syndrome (PCOS), a condition affecting hormone balance and ovulation. Beyond fertility, AMH trends over time can help guide decisions about egg freezing, family planning timelines, and even predict the approximate age of menopause. In males, AMH is also tested in infants and children to assess testicular function and diagnose certain developmental conditions.
Normal Ranges
Males
< 0.16 ng/mL in adult males; infants: 14–261 ng/mL (varies significantly with age and pubertal stage)
Females
1.0–3.5 ng/mL (optimal reproductive age 25–35); values decline with age: >1.0 ng/mL generally considered adequate reserve
Children
Varies by age and sex; females: 0.5–7.0 ng/mL prepubertally; males: elevated in infancy (up to 100+ ng/mL), declining through puberty
Causes of High Levels
- Polycystic ovary syndrome (PCOS) — the most common cause, as many small follicles produce excess AMH
- Granulosa cell tumors of the ovary — a rare ovarian cancer that secretes large amounts of AMH
- Excess antral follicle count from any cause, resulting in naturally higher baseline production
- Use of certain medications or supplements that artificially stimulate follicle activity
- Delayed puberty or premature ovarian hyperactivity in younger individuals
- Laboratory variation or timing of testing relative to hormonal fluctuations
Causes of Low Levels
- Advanced reproductive age — AMH naturally declines significantly after age 35 and drops to near zero at menopause
- Premature ovarian insufficiency (POI) — a condition where the ovaries stop functioning normally before age 40
How to Improve Your Anti-Müllerian Hormone
Diet
- Follow a Mediterranean-style diet rich in antioxidants (fruits, vegetables, olive oil, fish) to reduce oxidative stress on ovarian cells
- Increase intake of coenzyme Q10-rich foods like organ meats, sardines, and whole grains to support follicle energy metabolism
- Limit ultra-processed foods, refined sugars, and trans fats that promote inflammation and may accelerate follicle loss
- Ensure adequate vitamin D intake through fatty fish, egg yolks, and fortified dairy, as deficiency is linked to lower AMH
- Consume omega-3 fatty acids from salmon, walnuts, and flaxseeds to support hormonal balance and ovarian health
Supplements
- Coenzyme Q10 (CoQ10): 400–600 mg/day — may improve egg quality and mitochondrial function in aging follicles
- Vitamin D3: 1,000–2,000 IU/day (or as directed after testing) — low vitamin D is associated with reduced AMH levels
- DHEA (dehydroepiandrosterone): 25–75 mg/day — sometimes used under physician supervision to support ovarian reserve, particularly before IVF
- Inositol (myo-inositol): 2–4 g/day — particularly beneficial in women with PCOS to normalize AMH and improve follicle health
Related Biomarkers
Frequently Asked Questions
Can AMH levels change over time or be improved naturally?
AMH naturally declines with age as the egg supply diminishes, and this overall trend cannot be reversed. However, short-term fluctuations do occur, and some research suggests that lifestyle changes — such as improving diet, reducing oxidative stress with supplements like CoQ10, correcting vitamin D deficiency, and stopping smoking — may modestly support ovarian function and produce slightly higher AMH readings. It is important to have realistic expectations: these measures support ovarian health but cannot regenerate follicles that have already been lost.
What is considered a low AMH level and what does it mean for fertility?
Generally, an AMH below 1.0 ng/mL is considered low for a woman in her reproductive years, and below 0.5 ng/mL is considered very low or 'diminished ovarian reserve.' A low AMH means fewer eggs remain and may indicate reduced chances of natural conception, particularly as a woman ages. It can also mean a woman is likely to produce fewer eggs during IVF stimulation cycles. However, it is important to note that AMH predicts quantity, not necessarily quality — some women with low AMH do conceive naturally or with minimal intervention, especially when they are younger.
Does a high AMH level always mean PCOS?
A high AMH level (typically above 3.5–5.0 ng/mL in adults) is strongly associated with PCOS, but it does not confirm the diagnosis on its own. PCOS is diagnosed using specific clinical criteria that include irregular periods, signs of excess androgens, and ultrasound findings of multiple small follicles. Some women naturally have a high ovarian reserve without PCOS. In rare cases, very high AMH can indicate a granulosa cell tumor of the ovary. If your AMH is elevated, your doctor will consider your full clinical picture before making any diagnosis.