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Gyna

Getting pregnant and testing

Can I improve egg quality after 40, and what is realistic?

The short answer

Healthy changes can support you, but haven't been shown to reverse egg aging.

  • Over 40? Discuss fertility evaluation now; don't wait for a diet or supplement course.
  • Exactly 40? Evaluation is recommended after six months of trying; known problems can justify earlier care.
  • Considering an “egg-quality” supplement? Ask whether its research measured live births in people like you.

An ovarian-reserve result isn't an egg-quality score or a personal pregnancy forecast.

Evidence limits shown Sources are linked. Not yet reviewed by a clinician.

How we check answers

What can I do with this?

You don't need to finish a diet plan before asking about fertility care. If you're over 40, ACOG recommends discussing an evaluation now. At exactly 40, the age-based guidance recommends evaluation after six months of trying, with earlier assessment when your history suggests a problem. You can also ask for a planning conversation before that point. Those are different things: an invitation to discuss your options isn't a new diagnosis or a rule that everyone must start treatment.

Use that conversation to separate what you can support from what you need help understanding. A healthy diet, smoking support and a review of medicines can be worthwhile for preconception health. Ask your clinician which changes fit your situation, and don't stop prescribed medicine on your own. There is no evidence in the papers reviewed here for a required waiting course while a diet “works on your eggs.”

But does this apply to me?

This page is for someone around or over 40 deciding how to use their time while trying to conceive, rather than choosing a treatment. The diet and CoQ10 studies include fertility-treatment populations, not a representative group of everyone trying naturally after 40.

Findings from treatment with a person's own eggs also can't be applied unchanged to donor-egg treatment. Your history, goals and route to pregnancy belong in an individualized discussion.

Care and safety

When should I bring in a clinician?

Don't read a normal ovarian-reserve result as permission to postpone care, or a low result as a verdict that pregnancy is impossible. The test has to be interpreted with your history and the question it was ordered to answer. Absent periods, difficulty having sex, known pelvic disease or prior pelvic surgery are reasons for earlier assessment rather than waiting out an age-based clock.

This page can't calculate your chance of pregnancy, choose a treatment, or recommend a supplement regimen. It also doesn't make diet responsible for success or failure. If you're already receiving treatment, bring proposed supplements and diet changes to your team before making them part of the plan.

Understand the answer

So what does this mean for me?

What does the research actually say?

“Egg quality” often gets used as though it's one number you could improve and then recheck. The research asks several different questions. A model built from 325 ovarian measurements described how the pool of egg-containing follicles changes with age. It didn't follow those women trying to conceive or grade the eggs they released. The samples came from different people at different ages, including autopsy and surgical samples. That is evidence about population biology, not a measurement of your remaining chances.

An AMH blood test doesn't bridge that gap. AMH, or anti-Müllerian hormone, is related to the follicles in the ovaries. A review found it useful for anticipating how many eggs may be obtained after ovarian stimulation, while reporting very limited data on natural fertility. The review is older, from 2014, and we have its abstract rather than full text. ASRM's later natural-fertility guidance also cautions that ovarian-reserve markers poorly predict conception in women without infertility. A useful treatment-planning test is not automatically a forecast of pregnancy.

The diet findings are more hopeful than “food doesn't matter,” but narrower than “food repairs aging eggs.” A 2023 review found suggestive, limited evidence for Mediterranean-style eating and fertility outcomes. Its 32 studies covered reproductive health across life, so its total of 103,204 women wasn't a fertility-only sample. More than 95% of participants were White. Some of the clearer findings concerned pregnancy complications, which aren't the same outcome as conceiving or changing egg quality.

A 2026 review looked at 39 studies in assisted reproduction. Healthy dietary patterns had promising associations with some outcomes, but consistent effects on live birth weren't demonstrated, and no single diet was established as a way to improve in vitro fertilization (IVF) success. IVF involves fertilizing eggs in a laboratory. We read both reviews as abstracts. They give reasons to study diet carefully and support general health, not grounds to promise that eating differently reverses ovarian aging.

How does this compare with the official guidance?

ASRM distinguishes egg quantity from egg quality, including the age-related increase in eggs with abnormal chromosome numbers. Chromosomes carry genetic information; having too many or too few can affect whether an embryo develops into a pregnancy. The guidance also says that being healthier later in life doesn't offset the natural age-related decline in fertility. That isn't a judgment about how well you've looked after yourself.

We agree with the authorities about keeping general health and fertility assessment on parallel tracks. Where the research says more, such as promising supplement findings during treatment, we describe the actual result and its limits. We don't turn a cautious guideline into proof that nothing could help, or a positive study into a promise that a supplement restores younger eggs.

Why is this our answer?

This answer uses six research papers and four authority documents. The ovarian-reserve model is available in full; the five reviews are available as abstracts.

The strength of the answer differs by claim: the papers don't establish that a diet reverses egg aging, while some treatment studies report encouraging outcomes that need careful interpretation.

Sources for each main claim

What else are you wondering?

Explore all getting pregnant and testing questions

Check the evidence

How sure can I be?

See the full evidence snapshot and sources

Evidence snapshot

The same fields appear on every Gyna answer, including when the research did not report something reliably.

Question and decision
What can change after 40 and how to allocate time; not personal prognosis or treatment selection.
Who was studied
Cross-sectional ovarian tissue; diet studies across reproductive life and ART; CoQ10 trials in infertility/IVF/ICSI, not an all-women-over-40 cohort.
What was compared
Dietary patterns and CoQ10 versus study comparators; no regimen, dose or waiting period recommended here.
Outcome measured, and over what period
Follicle pool, stimulated egg yield, clinical pregnancy and live birth kept separate. No common follow-up horizon across this evidence.
Kinds of evidence included
Research studies and review abstracts set the limits; guidance from clinical bodies places the age, testing and care advice.
Studies and participants
Ovarian model: eight studies/325 measurements. Mediterranean review: 32 studies/103,204 across outcomes. ART diet: 39 studies. CoQ10 reviews: five RCTs/449 and six RCTs/1,529; not additive.
What the evidence shows
Some treatment and diet outcomes are favorable. No diet-induced egg-age reversal established; the cited 2020 CoQ10 review did not demonstrate live-birth improvement.
Consistency and disagreement
Positive clinical-pregnancy or egg-retrieval findings do not settle live birth. Broad authority pregnancy estimates differ and are not averaged.
Confidence in this answer
Limited for specific diet effects and transfer of supplement findings to natural conception after 40; no personal probability supported.
Strength of the sources
One full-text model, five abstract-only reviews, four authority documents. Model sampling, trial reporting and population limitations remain.
Review status
Sources are linked. Not yet reviewed by a clinician.
Who this does and does not describe
Treatment and egg-source-specific results cannot be applied unchanged to every reader around 40.
Harms, trade-offs and when to seek care
Avoid delayed care, restrictive diets, unreviewed supplement regimens, false reassurance and personal blame.
Last searched, and the records behind this
Last evidence search 2026-09-07. The source links are listed below.

Sources

Open the original guidance or study rather than taking our summary on trust.

  1. Human Ovarian Reserve from Conception to the Menopause

    pmc.ncbi.nlm.nih.gov

  2. The physiology and clinical utility of anti-Mullerian hormone in women

    Human Reproduction Update · 2014

  3. Mediterranean diet and female reproductive health over lifespan: a systematic review and meta-analysis

    American Journal of Obstetrics and Gynecology · 2023

  4. Diet in assisted reproductive technology: what should we recommend? A systematic review from current evidence to tailored nutritional approaches for enhancing reproductive success

    Reprod Biomed Online · 2026

  5. Does coenzyme Q10 supplementation improve fertility outcomes in women undergoing assisted reproductive technology procedures? A systematic review and meta-analysis of randomized-controlled trials

    J Assist Reprod Genet · 2020

  6. Clinical evidence of coenzyme Q10 pretreatment for women with diminished ovarian reserve undergoing IVF/ICSI: a systematic review and meta-analysis

    Ann Med · 2024

  7. Age and Fertility (patient education booklet)

    ASRM / ReproductiveFacts.org · Created 2012 (no update date listed)

  8. Optimizing natural fertility: a committee opinion (2022)

    ASRM · 2022 (Fertil Steril 2022;117:53-63; replaces 2013 version)

  9. Evaluating Infertility (FAQ136)

    ACOG · Published April 2020; Last reviewed May 2026

  10. Trying to get pregnant

    NHS · Page last reviewed 2 June 2026; next review 2 June 2029

How we looked, and what we found

“But what about coenzyme Q10, or CoQ10?” The studies deserve an accurate answer. A 2020 review of five randomized trials, involving 449 women receiving assisted reproduction, found a higher rate of clinical pregnancy, meaning a clinically confirmed pregnancy, with CoQ10. It did not demonstrate a difference in live birth, and the estimate was imprecise. Clinical pregnancy and live birth are different endpoints, so that finding can't be restated as more babies born.

A 2024 review of six trials in 1,529 people with diminished ovarian reserve undergoing IVF or intracytoplasmic sperm injection (ICSI), a form of assisted fertilization, also reported favorable clinical-pregnancy and egg-retrieval findings. Its authors flagged poor descriptions of trial methods; its abstract doesn't report a live-birth benefit. These reviews aren't evidence that CoQ10 reverses egg aging, nor do they establish the result for someone trying without treatment after 40. They also may include overlapping trials, so adding their participant counts would be misleading.

A useful question for your clinic is: “For my situation, which outcome could this change, how certain is that, and would waiting to take it change our care plan?” That makes room for a promising finding without making you responsible for trying every product first.

Who wrote this, and when will we revisit it?

Prepared by Gyna from research and professional guidance reviewed September 7, 2026. The references identify the sources behind the age, diet and supplement discussion; this isn't a prognosis or treatment recommendation.

Last updated
2026-09-09

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