AMH (Anti-Müllerian Hormone)
What it really means for your fertility — and what it doesn’t
AMH is a hormone commonly measured during fertility investigations, but it is widely misunderstood and often over-interpreted.
AMH does not measure how many eggs you have left. Women are born with all of their eggs; this number does not rise or fall based on AMH.
What AMH does reflect is something more dynamic:
How many follicles are in the pre-antral and early-antral stages of development during the ~90-day journey toward ovulation.
AMH rises when more follicles are in these early stages and falls when fewer are active. This is why AMH can go up or down and why it should never be taken as a fixed verdict on your fertility or your future.
If you have Polycystic Ovaries, you may have a very high AMH because more follicles remain paused in the early stages. This does not mean you have a higher ovarian reserve—it simply reflects how many follicles are “in motion.”
The lowest AMH I’ve supported to a successful natural conception is 0.1.
AMH alone does not determine your ability to get pregnant.
What matters more is the quality of the egg that reaches ovulation and the environment it develops in during those 90 days—something that can be supported through targeted, simple nutrition and lifestyle changes.
AMH vs Ovarian Reserve
These terms are often interchanged but mean different things:
Low Ovarian Reserve refers to the overall number of available follicles.
Low AMH reflects the current activity of follicles progressing through early developmental stages.
AMH cannot tell us how many eggs remain.
It tells us only how many follicles are producing AMH right now.
As women age, the pool of available follicles naturally declines. Egg quality can decline as well—but egg quality is also the area most responsive to lifestyle, nutrition, metabolic health, and reducing inflammation.
And you only need one healthy egg and healthy sperm for conception.
What Low AMH Actually Means
Low AMH means fewer follicles are currently entering the early developmental stages than would usually be expected for your age.
Possible contributors include:
Past or current smoking
Smoking is known to reduce AMH production.
Having one functioning ovary
AMH output reflects ovarian activity. One ovary naturally produces a lower signal than two.
Low Vitamin D
Vitamin D acts as a hormone messenger and supports follicle development.
Hormonal miscommunication
If thyroid, adrenal, insulin or pituitary signalling is under strain, AMH can appear lower.
Low DHEA
DHEA supports early follicular recruitment; low levels may reduce AMH output.
None of these factors determine egg quality, and none of them define your ability to conceive.
Low AMH and Time to Pregnancy
One of the most reassuring findings from research is this:
Women with low AMH and women with average AMH have very similar time-to-pregnancy outcomes when trying to conceive naturally.
Why?
Because:
Only one egg is released each cycle, no matter how many follicles are recruited.
AMH tells us about early follicle activity—not whether the egg that eventually reaches ovulation will be healthy or capable of fertilisation.
Women with high AMH still ovulate one egg.
Women with low AMH still ovulate one egg.
Pregnancy depends on the quality of that single egg and the quality of the sperm.
Time to pregnancy is shaped far more by:
• egg quality
• sperm DNA integrity
• metabolic and hormonal rhythm
• inflammation
• the environment in which the egg matured during the 90-day follicular journey
This aligns with the 2024 ACOG guidance: a single AMH level is not a useful tool for predicting how long it will take to conceive.
What the 2024 ACOG Guidelines Say
ACOG’s 2024 recommendations are clear:
AMH should not be used to counsel women with presumed fertility about their reproductive status or future fertility potential.
A single AMH test does not predict time to pregnancy.
AMH is not a predictor of menopause timing.
AMH is not part of the diagnostic criteria for PCOS.
AMH does not predict miscarriage risk.
AMH has limited use in post-chemotherapy fertility counselling due to insufficient data.
AMH tests vary by laboratory and lack international assay standardisation.
ACOG highlights that AMH has one primary proven clinical use:
predicting ovarian response to stimulation medications during IVF cycles.
Outside of that context, AMH is a limited marker—helpful to understand physiology, but never the full story.
Why AMH Fluctuates — and Why That’s Encouraging
AMH is produced only by follicles in the pre-antral and early-antral stages.
These stages occur during the ~90-day maturation window before ovulation.
This means your AMH today is influenced by:
• what your body was experiencing 1–3 months ago
• inflammation, blood sugar, thyroid and adrenal rhythm
• nutrient status
• stress physiology
• environmental exposures
• sleep and circadian rhythm
AMH can rise when these systems feel supported and fall when they are under strain.
Your AMH is a snapshot—not a prediction.
The Hormone Connection
Follicle recruitment depends on smooth communication across the hormonal network.
At Now Baby, sessions focus on supporting stability across:
Foundational tier: insulin signalling, blood sugar, adrenal regulation
Middle tier: thyroid communication, oestrogen and progesterone balance
Top tier: pituitary messages to the ovaries
When these tiers are steadier, AMH tends to reflect a calmer, more predictable pattern—and egg quality improves.
If Your AMH Is Low
The focus is not on increasing AMH.
The focus is on supporting the environment your next egg will develop in—because that is where the body is most responsive.
Simple, personalised nutrition and lifestyle changes can support metabolic rhythm, reduce inflammation, nourish hormones, and create a healthier environment for conception.
If you’d like support understanding your hormone rhythm or the 90-day egg development window, a Fertility Consultation offers personalised clarity.