How to Improve Egg Quality Naturally: Evidence-Based Strategies for Fertility

Egg quality refers to the genetic health and developmental potential of a woman's oocytes — their ability to be fertilised, develop into a viable embryo, and sustain a healthy pregnancy. As women age, egg quality declines primarily because of mitochondrial dysfunction and accumulated oxidative stress, which increase the risk of chromosomal abnormalities (aneuploidy) that are the leading cause of failed implantation, early miscarriage, and age-related infertility.¹

If you're trying to conceive and wondering whether there's anything you can do to support the health of your eggs, the research offers some encouraging answers. While no intervention can reverse reproductive ageing entirely, a growing body of evidence suggests that targeted nutritional support, antioxidant supplementation, and specific lifestyle changes may help protect your remaining eggs from further oxidative damage and support the energy-intensive process of oocyte maturation.²

What Is Egg Quality and Why Does It Matter for Fertility?

Egg quality describes whether an oocyte contains the correct number of chromosomes (46, arranged in 23 pairs) and has sufficient cellular energy to support fertilisation and early embryo development. High-quality eggs divide correctly during meiosis, resist oxidative damage, and contain enough mitochondrial energy reserves to fuel the first several days of embryonic growth before the embryo's own genome takes over.³

The distinction between egg quality and egg quantity is important. Ovarian reserve tests such as anti-Müllerian hormone (AMH) and antral follicle count (AFC) measure how many eggs you have remaining, but they cannot tell you about the genetic health of those eggs.⁴ A woman with low ovarian reserve may still have good-quality eggs, and a woman with a high egg count may still experience quality-related challenges. Age remains the single strongest predictor of egg quality — not because of a fixed biological clock, but because of the cumulative effects of oxidative stress and mitochondrial decline on eggs that have been dormant in the ovaries since before birth.

Studies of embryos created through IVF illustrate the scale of this decline: approximately 20% of eggs from women in their early 20s carry chromosomal abnormalities, rising to roughly 40% by age 35, approximately 60% by age 40, and over 80% by age 43.⁵ These chromosomal errors — most commonly aneuploidy — are the primary reason that fertility declines with age, that miscarriage rates increase, and that conditions such as Down syndrome become more common in pregnancies conceived later in life.

Why Do Eggs Lose Quality as You Age?

Egg quality declines with age because of a combination of mitochondrial dysfunction, accumulated oxidative stress, and deterioration of the cellular structures needed for accurate chromosome segregation during meiosis. Understanding these mechanisms helps explain why specific interventions — particularly antioxidants and mitochondrial support — may help.³

Human eggs are unique among cells in several ways. They are among the longest-lived cells in the body — a woman is born with all the oocytes she will ever have, and these cells remain in a state of suspended development (meiotic arrest) for decades before being recruited for ovulation. During those years of dormancy, eggs are exposed to cumulative oxidative stress from normal metabolic processes, environmental toxins, and inflammatory signals.⁶

Mitochondrial Decline: The Energy Crisis

Each mature oocyte contains approximately 100,000 to 600,000 mitochondria — far more than any other human cell.⁷ This extraordinary concentration exists because the process of oocyte maturation, fertilisation, and early embryo development is exceptionally energy-intensive. The egg must power meiotic division, chromosome segregation, and the first 3–5 days of embryonic cell division entirely from its own mitochondrial reserves, before the embryo's own mitochondria begin replicating.

As women age, the expression of enzymes responsible for producing coenzyme Q10 (CoQ10) — a critical component of the mitochondrial electron transport chain — decreases in oocytes.⁸ Reduced CoQ10 levels mean less efficient ATP (energy) production, which compromises the energy-dependent processes of chromosome alignment and separation during meiosis. When the meiotic spindle — the cellular machinery that pulls chromosomes apart — doesn't receive adequate energy, chromosomes are more likely to be distributed unequally, producing aneuploid eggs.

Oxidative Stress: The Cumulative Damage

Reactive oxygen species (ROS) are natural byproducts of mitochondrial energy production. In small quantities, they serve important signalling functions. But when ROS production outpaces the cell's antioxidant defences — a state called oxidative stress — the excess free radicals damage DNA, lipid membranes, and proteins within the oocyte.⁹ This damage accumulates over decades of dormancy.

The ovary's own antioxidant defences, including glutathione, superoxide dismutase, and catalase, decline with age — meaning that older eggs have both greater ROS exposure and fewer resources to neutralise it.¹⁰ This creates a cycle of increasing vulnerability.

Cohesion Protein Degradation

Beyond energy and oxidative damage, a third mechanism contributes to age-related egg quality decline. Cohesin proteins — the molecular "glue" that holds chromosome pairs together during meiosis — deteriorate over time.¹¹ Because oocytes cannot produce new cohesin proteins during their decades-long arrest, the original proteins gradually degrade. Weakened cohesion increases the risk of premature chromosome separation, leading to aneuploidy.

What Is the 90-Day Egg Quality Window?

The 90-day egg quality window refers to the approximately 90 days it takes for a primordial follicle to be recruited from the dormant pool, develop through multiple stages, and mature into an ovulatory-ready egg. This timeline is clinically significant because it defines the minimum period during which lifestyle changes, supplements, and nutritional improvements can influence the developing egg.¹²

During the final stages of folliculogenesis, the oocyte undergoes rapid growth, accumulates mitochondria, synthesises the proteins needed for meiosis, and builds the zona pellucida (the protective shell that surrounds the egg). These processes are directly influenced by the hormonal, nutritional, and oxidative environment of the follicular fluid — which is, in turn, influenced by your overall health.¹³

This is why fertility specialists typically recommend that women begin preconception supplements and lifestyle changes at least three months before trying to conceive. Changes made today don't affect the egg you'll ovulate next week — that egg has already completed most of its development. Instead, they affect the eggs currently being recruited for development over the coming months.

For women preparing for IVF, this timeline is equally relevant. Starting CoQ10, antioxidant support, and dietary optimisation 8–12 weeks before an egg retrieval cycle gives the developing cohort of follicles the best chance of benefiting from those interventions.

Which Supplements Have Evidence for Supporting Egg Quality?

Several nutritional supplements have been studied for their potential to support egg quality, primarily through antioxidant protection and mitochondrial energy support. The evidence varies considerably — some have data from randomised controlled trials in humans, while others are supported mainly by animal research and mechanistic studies.

Important: Supplements should complement — not replace — a balanced diet, healthy lifestyle, and medical care. Always discuss supplementation with your healthcare provider, particularly if you are undergoing fertility treatment, as some supplements may interact with medications or affect your response to ovarian stimulation.

How Does CoQ10 Support Egg Quality?

CoQ10 is the most-studied supplement for egg quality, with a clear mechanistic rationale and supporting clinical data. As a critical component of the mitochondrial electron transport chain, CoQ10 directly facilitates ATP production — the energy currency that oocytes depend on for chromosome segregation, meiotic spindle formation, and early embryo development.⁸

Research in both animal models and humans suggests that CoQ10 levels in oocytes decline with age. A landmark 2015 study published in Aging Cell demonstrated that CoQ10 supplementation in aged mice restored oocyte mitochondrial function, reduced chromosomal abnormalities, and improved fertility outcomes — findings consistent with the mitochondrial decline theory of egg quality loss.⁸ In human studies, a 2018 randomised controlled trial found that women under 35 with diminished ovarian reserve who took 600 mg of CoQ10 daily for 60 days before IVF had significantly more retrieved oocytes, a higher fertilisation rate, and more high-quality embryos compared to controls.¹⁴

A 2020 systematic review and meta-analysis examining CoQ10 supplementation in women undergoing assisted reproductive technology found that CoQ10 was associated with higher clinical pregnancy rates (28.8% vs 14.1%) compared to placebo or no treatment.¹⁵ However, the authors noted that the included studies were relatively small, and larger, well-designed trials are still needed.

The two main supplemental forms are ubiquinone (oxidised) and ubiquinol (reduced, active). Ubiquinol has higher bioavailability, meaning lower doses may achieve similar blood levels.¹⁶ Typical dosage ranges in fertility research are 400–600 mg/day, usually started at least 8–12 weeks before conception attempts.

What Does the Evidence Show for DHEA?

Dehydroepiandrosterone (DHEA) is an androgen precursor that has generated significant interest for women with diminished ovarian reserve or poor ovarian response to IVF. The rationale is that androgens play a role in early follicular recruitment and development — and that supplementing DHEA may support this process in women whose ovarian function is declining.¹⁷

A 2016 systematic review and meta-analysis of 21 studies found that DHEA supplementation led to increased clinical pregnancy rates among women with diminished ovarian reserve undergoing IVF.¹⁸ Some studies have also reported improvements in AMH levels and numbers of retrieved oocytes. However, the evidence remains contested — a large Cochrane review noted that many of the positive studies had methodological limitations, and not all trials have found significant benefits.¹⁹ It is worth noting that some prominent DHEA researchers have disclosed commercial interests in DHEA supplementation, which is important context when evaluating the evidence base.

DHEA is a hormonal supplement and should only be used under medical supervision. It is not appropriate for all women — for example, it is generally not recommended for women with PCOS (who already have elevated androgens) or for those without evidence of diminished ovarian reserve.

Can Melatonin Improve Egg Quality?

Melatonin is best known as the sleep-regulating hormone, but it is also a potent antioxidant that is found in high concentrations in ovarian follicular fluid. Follicular melatonin levels decline with age, mirroring the broader pattern of reduced antioxidant defences in the ovary.²⁰

Several small randomised controlled trials in IVF populations have examined melatonin supplementation at 3 mg per day. These studies have reported trends toward increased numbers of mature oocytes, higher-quality embryos, and improved clinical pregnancy rates — though many of these improvements did not reach statistical significance due to small sample sizes.²¹ A 2024 review in Frontiers in Endocrinology concluded that antioxidant therapies including melatonin show promise for improving ART outcomes but that larger trials are needed before firm recommendations can be made.²²

Melatonin is generally well-tolerated, though it may cause drowsiness. Women considering melatonin for egg quality should discuss timing and dosage with their healthcare provider, particularly if they are using other fertility medications.

How Does Nutrition Affect Egg Quality?

The nutritional environment of the ovarian follicle directly influences the developing oocyte. Follicular fluid — the liquid that surrounds the egg as it matures — reflects the composition of your blood, meaning that what you eat and absorb reaches your developing eggs.²³ Several dietary patterns and specific nutrients have been associated with better egg quality and fertility outcomes.

Does Diet Really Make a Difference?

Observational studies consistently show that a Mediterranean-style dietary pattern — rich in vegetables, fruits, whole grains, legumes, fish, and olive oil — is associated with improved fertility outcomes. A large prospective cohort study from the Nurses' Health Study II found that women who followed a "fertility diet" pattern (higher intake of monounsaturated fats, plant protein, low-glycaemic carbohydrates, and full-fat dairy) had a significantly lower risk of ovulatory infertility.²⁴

The mechanisms are multifactorial. Anti-inflammatory dietary patterns reduce systemic oxidative stress, improve insulin sensitivity (which affects ovarian hormonal signalling), and provide the raw materials — vitamins, minerals, and antioxidants — that the oocyte needs during its development.

Key Nutrients for Egg Quality

Omega-3 fatty acids are structural components of cell membranes, including oocyte membranes and mitochondrial membranes. A 2022 systematic review found that omega-3 supplementation or dietary intake was associated with improved oocyte quality in women undergoing ART, evaluated by both morphological and morphokinetic parameters.²⁵ Animal studies show that omega-3 rich diets prolong reproductive lifespan and improve oocyte mitochondrial dynamics.²⁶ Dietary sources include oily fish (salmon, mackerel, sardines), walnuts, chia seeds, and flaxseeds.

Folate is essential for DNA methylation — the process by which genes are switched on and off during oocyte maturation and early embryo development. During gametogenesis, methylation patterns are erased and reset, a process that requires adequate folate availability.²⁷ Methylfolate (5-MTHF) is the bioactive form and is recommended over synthetic folic acid, particularly for the significant proportion of the population who carry MTHFR variants (such as C677T) that may reduce their ability to convert folic acid to its active form. All women trying to conceive should take at least 400 mcg of folate daily, regardless of dietary intake, to prevent neural tube defects.

Antioxidant-rich foods — berries, leafy greens, nuts, dark chocolate, and colourful vegetables — provide a diverse range of protective compounds including vitamins C and E, selenium, and polyphenols that support the ovary's antioxidant defences against ROS damage.

Foods and Substances to Limit

Trans fats and highly processed foods promote inflammation and insulin resistance, both of which impair ovarian function. Excessive sugar and refined carbohydrates trigger insulin spikes that can disrupt hormonal balance. Alcohol at moderate to high levels has been associated with increased oxidative stress and reduced fertility outcomes in several studies, though low-level consumption remains debated.²⁸ Caffeine in moderate amounts (under 200 mg/day, roughly one to two cups of coffee) does not appear to harm fertility, but high intake may be associated with reduced fecundability.²⁹

Can Lifestyle Changes Improve Egg Quality?

While you cannot reverse reproductive ageing, specific lifestyle modifications can reduce additional oxidative stress on your eggs and create a more supportive environment for the follicles currently developing. Research suggests that the impact of lifestyle factors on egg quality is meaningful — and unlike age, these factors are within your control.

How Does Exercise Affect Egg Quality?

Regular moderate exercise improves blood flow to the ovaries, enhances insulin sensitivity, reduces chronic inflammation, and helps maintain a healthy body weight — all factors that support a healthier follicular environment.³⁰ Current guidelines recommend 150 minutes per week of moderate-intensity activity for preconception health.

However, extreme exercise can be counterproductive. Very high-intensity training or significant caloric deficit from excessive exercise can suppress the hypothalamic-pituitary-ovarian (HPO) axis, leading to disrupted ovulation — a condition known as hypothalamic amenorrhoea.³¹ The goal is consistent, moderate activity rather than intense training regimens.

How Does Sleep Affect Your Eggs?

Sleep regulates melatonin production — and as discussed above, melatonin is a potent antioxidant present in ovarian follicular fluid that helps protect oocytes from oxidative damage.²⁰ Disrupted sleep patterns, shift work, and chronic sleep deprivation have been associated with hormonal disruption, impaired ovulation, and reduced fertility in observational studies.³² Aim for 7–8 hours of consistent sleep per night, ideally with a regular sleep-wake schedule.

How Do Environmental Toxins Damage Egg Quality?

Environmental endocrine disruptors can directly damage developing oocytes and disrupt the hormonal signals that govern follicular maturation. The most well-studied reproductive toxicants include:

• Bisphenol A (BPA): Found in plastics, can linings, and thermal receipt paper. BPA has oestrogenic activity and has been associated with reduced oocyte maturation and increased meiotic abnormalities in both animal and human studies.³³
• Phthalates: Present in fragrances, soft plastics, and personal care products. Phthalates disrupt ovarian steroidogenesis and have been associated with lower antral follicle counts and reduced IVF success rates.³⁴
• Cigarette smoke: Contains hundreds of toxicants including polycyclic aromatic hydrocarbons that accelerate follicular atresia (egg cell death) and directly damage oocyte DNA. Smoking is one of the most well-established modifiable risk factors for poor egg quality and accelerated ovarian ageing.³⁵

Practical steps to reduce exposure include choosing BPA-free containers, avoiding heating food in plastic, selecting fragrance-free personal care products, using glass or stainless steel for food storage, and — most importantly — stopping smoking if you currently smoke.

Does Stress Affect Egg Quality?

Chronic psychological stress elevates cortisol levels, which can impair ovarian blood flow, disrupt hormonal signalling, and increase systemic oxidative stress — all of which may affect the follicular environment.³⁶ While acute stress is unlikely to damage egg quality, prolonged or severe stress may compound the effects of other risk factors. Mind-body practices including yoga, meditation, and mindfulness-based stress reduction have been studied in fertility populations with some evidence of improved hormonal profiles and treatment outcomes, though the mechanisms remain under investigation.

Does Age-Specific Guidance Matter for Egg Quality?

The approach to supporting egg quality should be adjusted based on your age, because the underlying biology and the urgency of intervention differ across age groups. Here's what the evidence suggests for different life stages:

Under 35: Egg quality is generally still good, with aneuploidy rates below 40%. The focus at this age should be on building a strong foundation: a nutrient-dense diet, regular exercise, adequate folate supplementation, and reducing obvious risk factors (smoking, excessive alcohol, environmental toxins). For most women in this age group, targeted supplements beyond a good prenatal vitamin are not essential unless there are specific indications such as PCOS or diminished ovarian reserve.

35–39: This is the age range where egg quality decline accelerates. CoQ10 supplementation (400–600 mg/day) becomes more relevant, as does ensuring adequate vitamin D levels. Women in this group may benefit from a more proactive approach including antioxidant-rich nutrition, omega-3 supplementation, and the full 90-day preconception preparation period. If you've been trying to conceive for six months without success, guidelines recommend seeking fertility evaluation — the standard 12-month threshold applies to women under 35.³⁷

40 and over: Aneuploidy rates exceed 60%, and the proportion of eggs with sufficient mitochondrial reserves decreases significantly. At this age, maximising every modifiable factor becomes more important. CoQ10, melatonin, DHEA (if indicated for low ovarian reserve), omega-3s, and comprehensive antioxidant support are reasonable additions to a preconception regimen — in addition to medical evaluation and potentially assisted reproductive technology. The timeline is also compressed — women over 40 should seek fertility evaluation after just three months of trying.³⁷

What About Egg Quality and Specific Conditions?

Certain conditions affect egg quality beyond the effects of normal ageing. If you have one of these conditions, your approach to supporting egg quality may need to be tailored.

PCOS: Despite causing ovulatory dysfunction, PCOS does not inherently reduce egg quality — and women with PCOS often have higher ovarian reserve (AMH levels) than age-matched peers. However, the hormonal and metabolic features of PCOS, particularly insulin resistance and chronic inflammation, can affect the follicular environment. Myo-inositol, vitamin D, and CoQ10 have all been studied in PCOS populations with positive results.³⁸ Read our comprehensive guide on PCOS and fertility for detailed strategies.

Diminished ovarian reserve (DOR): Women with DOR have fewer remaining eggs, making the quality of each egg even more critical. CoQ10 and DHEA are the most-studied supplements for this population. A time-sensitive evaluation by a reproductive endocrinologist is recommended, as treatment windows may be narrower.

Endometriosis: Endometriosis creates a highly inflammatory and oxidatively stressful environment in the pelvis, which can impair oocyte quality even when ovarian reserve is preserved. Antioxidant supplementation may be particularly relevant for women with endometriosis and fertility challenges.

Frequently Asked Questions

Can you actually improve egg quality, or just slow the decline?

Current evidence suggests that interventions like CoQ10 supplementation can support the mitochondrial function of developing oocytes and may reduce the rate of chromosomal errors, but they cannot reverse the underlying biological ageing of dormant eggs. The most accurate framing is that you can optimise the environment in which your remaining eggs develop over their final 90-day maturation period, potentially improving the quality of the eggs you ovulate — rather than rejuvenating eggs that have already been damaged.

How long does it take for supplements to affect egg quality?

Because it takes approximately 90 days for a follicle to develop from recruitment to ovulation, supplements and lifestyle changes need at least three months to influence the eggs you will ovulate. Most fertility specialists recommend starting a preconception supplement regimen at least 90 days — and ideally 4–6 months — before trying to conceive or beginning an IVF cycle.

What is the best form of CoQ10 for fertility — ubiquinone or ubiquinol?

Ubiquinol is the reduced, active form of CoQ10 and has higher bioavailability than ubiquinone, meaning your body can use it more readily. Some research suggests that ubiquinol achieves higher blood levels at equivalent doses. However, both forms have been used in fertility studies with positive results. If cost is a factor, ubiquinone at a higher dose (600 mg/day) may offer comparable benefits to ubiquinol at a lower dose (200–400 mg/day).

Does egg quality affect IVF success rates?

Egg quality is the single most important factor determining IVF success. The number of eggs retrieved matters less than their chromosomal normality. Preimplantation genetic testing for aneuploidy (PGT-A) has shown that transferring a single chromosomally normal embryo — regardless of the woman's age — results in implantation rates of approximately 60–70%. The challenge is that the proportion of chromosomally normal eggs decreases with age, meaning older women may need more IVF cycles to find a healthy embryo.

Can diet alone improve egg quality?

Diet contributes to egg quality by providing antioxidants, essential fatty acids, and micronutrients that support follicular development, and by reducing inflammation and insulin resistance that can impair the ovarian environment. Observational studies associate Mediterranean-style dietary patterns with better fertility outcomes. However, diet alone is unlikely to fully compensate for age-related mitochondrial decline, which is why targeted supplementation — particularly CoQ10 — is often recommended alongside dietary optimisation for women over 35.

Is DHEA safe to take for egg quality?

DHEA is a hormonal supplement that should only be taken under medical supervision. It has been studied primarily in women with diminished ovarian reserve or poor ovarian response to IVF, with some evidence of improved outcomes in these populations. It is not appropriate for all women — for example, it is generally not recommended for women with PCOS, who already have elevated androgen levels. Side effects can include acne, hair growth changes, and mood changes. Discuss DHEA with your reproductive endocrinologist before use.

At what age does egg quality start to decline?

Egg quality begins to decline gradually from the early 30s, with a more noticeable acceleration after age 35 and a steep decline after age 40. By the early 40s, more than half of all eggs are likely to be chromosomally abnormal. However, the rate of decline varies between individuals — some women maintain good egg quality into their late 30s, while others experience earlier decline due to genetics, lifestyle factors, or conditions like endometriosis or premature ovarian insufficiency.

Do antioxidant supplements help with egg quality?

Antioxidants such as CoQ10, vitamin E, melatonin, and NAC help neutralise reactive oxygen species (ROS) that damage oocyte DNA, mitochondria, and cell membranes. The rationale is well-supported by the biology of oocyte ageing, and some clinical studies — particularly of CoQ10 and melatonin in IVF populations — have shown promising results. However, a 2024 umbrella review concluded that while antioxidant supplements appear safe and well-tolerated, no single supplement can yet be definitively recommended based on current evidence alone, and more large-scale RCTs are needed.

Supporting Your Fertility with FertilitySmart

Egg quality depends on adequate levels of several key nutrients, including CoQ10 for mitochondrial energy production, folate for DNA methylation and integrity, vitamin E for antioxidant protection of oocyte membranes, and zinc and selenium for reproductive enzyme function.

At FertilitySmart, we offer both fertility supplements for women and fertility supplements for men that contain key nutrients such as CoQ10, vitamin E, folate, zinc, and selenium. Explore our range of evidence-based fertility supplements formulated with the nutrients discussed in this guide.

Related Reading

Explore these resources for deeper insights into the topics covered in this guide.

• CoQ10 and Fertility: What Does CoQ10 Do?
  A detailed look at CoQ10's role in mitochondrial function, energy production, and how it supports both egg and sperm quality.
• Vitamin E for Fertility
  Understanding how vitamin E acts as a lipid-soluble antioxidant to protect oocyte membranes and support endometrial health.
• PCOS and Fertility: How to Improve Your Chances Naturally
  If PCOS is affecting your ovulation, this pillar guide covers the full range of lifestyle, supplement, and medical strategies.
• Myo-Inositol for Fertility and PCOS
  A deep dive into how myo-inositol supports insulin sensitivity, ovulation, and oocyte quality — particularly relevant for women with PCOS.
• Fertility and Endometriosis
  How endometriosis creates an oxidatively stressful environment that may impair egg quality, and what can be done to support fertility.
• Folic Acid and Fertility
  Why folate is essential for DNA methylation during egg development and neural tube protection in early pregnancy.
• Magnesium and Fertility
  The role of magnesium in over 300 enzymatic processes including those critical to egg development and implantation.
• Trying to Conceive at 35+
  Practical guidance for women over 35, where supporting egg quality through targeted nutrition and lifestyle becomes especially important.
• Top 10 Fertility Supplements
  A ranked overview of the most evidence-backed fertility supplements for both women and men, with dosage guidance and evidence ratings.
• Boost Fertility in Your 40s
  For women over 40, where maximising egg quality becomes the single most important modifiable factor for natural conception and IVF success.

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Marina Carter

Health & Fertility Writer at FertilitySmart

Marina Carter is a health and fertility writer who specialises in translating complex reproductive science into clear, evidence-based content. With a background in health communications and nutritional science, Marina has spent over a decade researching the intersection of nutrition, supplementation, and reproductive health. She works closely with fertility specialists and clinical researchers to ensure that every article reflects current scientific understanding and clinical practice. Marina's writing philosophy centres on empowering readers with accurate, balanced information — free from hype or unsubstantiated claims — so they can make informed decisions about their fertility journey. When she's not reviewing research papers or interviewing clinicians, Marina advocates for greater transparency in the supplements industry and improved access to evidence-based fertility education. Read Full Bio →