Egg Quality After 35: Nutrition, Lifestyle and Supplements

For many people, egg quality becomes a more pressing concern from the mid-thirties onwards, particularly for those trying to conceive, preparing for IVF, considering egg freezing, or navigating a diagnosis of low ovarian reserve. This is often when questions about nutrition, lifestyle and supplements start to feel more urgent.

Age is the strongest known factor affecting both the number of eggs a person has and their quality. This is a gradual biological process that begins well before any noticeable signs appear, and it is important to be clear from the outset: no supplement, diet or lifestyle programme can reverse age-related changes in egg number or egg quality. These changes are a normal, expected part of reproductive ageing.

That said, nutrition, lifestyle and clinician-guided supplementation may support general reproductive health, including mitochondrial function, hormone balance and protection from oxidative stress, alongside appropriate fertility care rather than instead of it. None of this can guarantee an outcome, and individual suitability varies from person to person.

If you are 35 or over, and especially if you are 40 or over, have a known fertility concern, or are preparing for treatment, it is worth seeking personalised guidance from a fertility specialist. This article looks at female fertility and egg quality, and where nutrition, lifestyle and supplements may fit into a broader plan.

What supplements are commonly considered for egg quality after 35?

For women aged 35 and over, supplements are commonly considered as part of a wider preconception or fertility-treatment plan. They cannot reverse age-related changes in egg number or egg quality, restore ovarian reserve or guarantee pregnancy.

Nutrients commonly discussed include CoQ10 or ubiquinol, folate, vitamin D, omega-3 fatty acids and, where PCOS, insulin resistance or irregular ovulation is relevant, myo-inositol. Antioxidants such as vitamins C and E, zinc and selenium may also be discussed in relation to oxidative stress.

The most appropriate approach depends on your age, diet, medical history, medicines, existing supplements and whether you are preparing for IVF or egg freezing. For women aged 40 and over, earlier fertility assessment is particularly important, as age-related changes become more clinically significant.

On this page

• Why egg quality matters after 35
• What affects egg quality?
• Nutrients commonly considered for egg health after 35
• Lifestyle foundations for reproductive health
• Egg quality support before IVF or egg freezing
• Understanding the Ultimate Egg Health Pack
• What supplements cannot do
• Frequently asked questions

Why egg quality matters after 35

Unlike sperm, which regenerate throughout adult life, a woman is born with the supply of eggs she will have over her lifetime. Over time, both the number of eggs remaining and the proportion that are chromosomally normal decline. This is a gradual process, rather than a sudden change at a particular birthday, although age-related fertility decline becomes more clinically significant through the mid-thirties and beyond.¹

Egg quality is one of several factors that can influence fertilisation, embryo development and the chance of pregnancy. As eggs age, chromosomal abnormalities become more common, which contributes to the age-related decline in fertility and increase in miscarriage risk.² Egg quality is only one part of fertility, however, alongside ovulation, sperm health, uterine factors, tubal health, age and underlying health conditions.

What affects egg quality?

Age remains the most well-established factor in changes to egg number and egg quality. However, reproductive health is influenced by a number of biological, environmental and lifestyle factors, and the relevance of each varies between individuals.

• Oxidative stress: An imbalance between reactive oxygen species and antioxidant defences may affect reproductive processes, including oocyte maturation and fertilisation.³
• Hormonal factors: Irregular hormone signalling can affect ovulation and the process of follicle and egg maturation.
• Inflammation: Chronic inflammation may affect ovulation and reproductive function, depending on its cause.
• Environmental exposures: Endocrine-disrupting chemicals, including some phthalates, BPA and pesticides, have been associated with potential adverse effects on reproductive health.⁴
• Diet and nutrient intake: A varied diet that provides sufficient energy, protein, vitamins, minerals and essential fats supports general health and normal reproductive function.
• Underlying fertility factors: Conditions such as PCOS, endometriosis, thyroid disorders and reduced ovarian reserve may require individual assessment and care.

While no lifestyle approach can reverse age-related changes, supportive habits may help create a healthier foundation for general reproductive wellbeing.

Nutrients commonly considered for egg health after 35

Different nutrients may be relevant for different reasons, but supplement choice should take account of your diet, health history, medications, fertility diagnosis and treatment plan. The evidence for individual supplements varies, and a product that is appropriate for one person may not be appropriate for another.

CoQ10 is involved in mitochondrial energy production and is found in cells throughout the body. Mitochondrial function is relevant to oocyte maturation, and CoQ10 has therefore been widely studied in the context of reproductive ageing. However, it cannot reverse age-related changes in egg quality, and evidence that it improves clinical fertility outcomes remains limited.⁵ Zita West uses Kaneka Ubiquinol, a form of CoQ10 that has been studied for its bioavailability — read the Kaneka Ubiquinol research to find out more.

Kaneka Ubiquinol

A highly bioavailable form of CoQ10, taken as a daily capsule. Commonly considered by people preparing for IVF, egg freezing or general preconception support, and available in a range of pack sizes. Individual suitability should be discussed with a fertility specialist, particularly before treatment.

Explore Kaneka Ubiquinol

Myo-inositol is commonly discussed in relation to PCOS and metabolic health. Current guidance notes that it may be considered according to individual preferences, although evidence for benefits in ovulation, clinical pregnancy and live birth remains limited and uncertain. It should not be described as directly improving egg quality.⁶ Read more about myo-inositol and fertility.

Inositol and Folate

A powder combining myo-inositol and folate, commonly discussed for hormonal balance and preconception support, particularly for people with PCOS or irregular ovulation. Available as a 1-month or 3-month supply. Suitability varies, so it is worth discussing with a healthcare professional.

Explore Inositol and Folate

Folate is essential for DNA synthesis and cell division. It is recommended before conception to help prevent neural tube defects, and the most appropriate form and dose can depend on an individual's needs.⁷ You can read more about folate and fertility.

Vitamin D status is commonly considered in preconception and fertility care. Observational IVF research has reported an association between vitamin D status and pregnancy outcomes, but this does not establish that vitamin D supplementation improves fertility outcomes.⁸ Low levels are common in the UK, and some people may benefit from discussing testing or supplementation with their healthcare professional.

Omega-3 fatty acids, including DHA and EPA, are important components of cell membranes and are commonly discussed as part of an overall healthy dietary pattern. Their specific role in egg quality and fertility outcomes continues to be studied.⁹

Antioxidants such as vitamins C and E, zinc and NAC are commonly discussed in relation to oxidative stress, which may affect cells at a biological level, including in the ovaries. Antioxidant intake from a varied diet is also a relevant consideration alongside any supplement choices.

Lifestyle foundations for reproductive health

Supplements should be considered alongside, rather than instead of, the broader lifestyle factors that support general health and reproductive wellbeing.

1. Diet — A varied diet rich in vegetables, fruit, legumes, wholegrains, nuts, seeds, oily fish and unsaturated fats can support overall nutritional status. A Mediterranean-style dietary pattern is commonly discussed in relation to preconception health. Learn more about nutrition for healthy eggs.
2. Exercise — Moderate, regular movement supports general cardiovascular and metabolic health. It is important to find an activity level that is sustainable and appropriate for your circumstances.
3. Sleep — Sleep is important for general physical and mental health. Adults are commonly advised to aim for around 7 to 9 hours of sleep each night.
4. Stress management — Managing stress can support overall wellbeing, and approaches such as mindfulness, yoga and acupuncture are tools some people find helpful. However, stress is not considered a sole cause of fertility difficulties, and managing it cannot guarantee a particular outcome.
5. Environmental exposures — Reducing avoidable exposure to endocrine-disrupting chemicals where practical, such as avoiding heating food in plastic containers, may be a reasonable part of a broader health-conscious approach.

These foundations are not a replacement for fertility assessment or treatment, but they can form part of a broader preconception plan.

Egg quality support before IVF or egg freezing

Why preparation may begin several months before treatment

Follicles and eggs develop over a period of time before ovulation or retrieval, which is why some people choose to begin reviewing their nutrition, lifestyle and supplement routine in the months before IVF or egg freezing.¹⁰ You may see this discussed as starting around three months beforehand, but this is a common approach rather than a universal clinical rule. Treatment timelines are individual and set by your fertility clinic, so it is worth checking their guidance for your specific protocol.

Supplements should fit your treatment plan

Fertility medicines, treatment protocols, medical history and any supplements you are already taking all need to be considered together, rather than adding a new routine in isolation. It is not advisable to begin high-dose or multiple-supplement protocols without discussing them with your fertility clinic, GP or pharmacist first, since some combinations may not be appropriate for your situation or treatment stage. If you are planning to start CoQ10 or another supplement ahead of treatment, our guide to timing CoQ10 before IVF explains some of the general considerations, but your clinical team remains the best source of advice for your own protocol. Sharing a full list of what you are already taking, including over-the-counter products, helps your clinic advise you accurately.

Low AMH is not the same as egg quality

AMH, or anti-Müllerian hormone, is commonly used as one indicator of ovarian reserve, which relates to the expected number of eggs remaining rather than directly measuring their quality.¹¹ A low AMH result can understandably feel worrying, but it should be interpreted by a fertility specialist alongside your age, cycle history, ultrasound findings and overall treatment plan, rather than viewed in isolation. There is currently no single blood test that measures egg quality directly. Our guide to low AMH and egg quality looks at this distinction in more detail and may help you understand what your own results could mean.

Understanding the Ultimate Egg Health Pack

The Zita West Ultimate Egg Health Pack brings together products that are commonly considered within a broader nutritional approach to egg health. It is designed as a convenient option for people who want to discuss a combined supplement routine, but it is not a substitute for personalised medical advice, fertility assessment or treatment from a fertility clinic.

The pack includes eight products:

Whether a combined pack is appropriate depends on your individual circumstances, existing supplements, dietary intake, medications and fertility treatment plan. If you are unsure which products may be suitable for you, speak to your GP, pharmacist or fertility specialist.

Ultimate Egg Health Pack

A combined pack of eight products commonly considered together as part of a broader nutritional approach to egg health, including CoQ10, myo-inositol, folate and vitamin D. Not a substitute for personalised medical advice or fertility treatment.

Explore the Ultimate Egg Health Pack

What supplements cannot do

It is important to be realistic about what supplements can and cannot do, however carefully they are chosen. Supplements cannot reverse age-related changes in egg number or egg quality, and they cannot restore ovarian reserve once it has declined. They also cannot guarantee conception, fertilisation, embryo development or pregnancy, and no supplement can diagnose the reason for any fertility difficulties you may be experiencing, since that requires proper clinical assessment, testing and, where relevant, imaging rather than a nutritional approach alone.

Used thoughtfully, supplements may form one part of a broader preconception or fertility treatment plan, alongside the lifestyle foundations, nutrition and clinical care discussed elsewhere in this article. They should not, however, be used as a reason to delay appropriate fertility assessment or treatment, particularly if you already have concerns about your own fertility, are approaching or over 35, or are preparing for IVF or egg freezing. Where possible, treat nutrition and supplements as a complement to specialist care rather than a substitute for it.

• If you are aged 35 or over and have been trying to conceive for six months, consider speaking to your GP or a fertility specialist.¹²
• If you are over 40, have irregular cycles, have received a low AMH result, have experienced recurrent miscarriage or are preparing for IVF, seek personalised advice early.
• Discuss supplements with a healthcare professional if you take prescription medication or are following a fertility treatment protocol.
• Avoid building a high-dose supplement routine from multiple products without checking for duplication or suitability.

Frequently asked questions

Can supplements improve egg quality?

No. Supplements cannot reverse age-related changes in egg number or egg quality, and no product can undo the natural effects of ageing on the ovaries. That said, some nutrients are commonly considered because they may support general reproductive health, including mitochondrial function, hormone balance and protection from oxidative stress, all of which are relevant to the conditions in which eggs mature. The strength of evidence varies by nutrient, by individual health condition and by treatment context, so what may be relevant for one person is not automatically relevant for another. It is worth discussing your individual situation with a fertility specialist, especially if you are preparing for IVF or egg freezing.

What supplements are commonly considered for egg quality after 35?

For women aged 35 and over, nutrients commonly considered for egg health include CoQ10 or ubiquinol, folate, vitamin D, omega-3 fatty acids and, where relevant, myo-inositol. Antioxidants are also considered, whether from a varied diet or, in some cases, from supplements. None of these can improve fertility outcomes on their own, and the evidence supporting each varies. They are generally discussed in relation to supporting mitochondrial function, hormone balance and protection from oxidative stress, rather than as a guaranteed route to healthier eggs. The most suitable approach depends on your health history, diet, medications and fertility plan.

What supplements are commonly considered for egg quality after 40?

For women over 40, supplements commonly discussed with a fertility specialist include CoQ10 or ubiquinol, folate, vitamin D, omega-3 fatty acids and, where relevant, myo-inositol. These nutrients may support general reproductive health, nutritional status, mitochondrial function or hormone balance, but they cannot reverse age-related changes in egg number or egg quality, restore ovarian reserve or guarantee pregnancy. Because time can matter more after 40, it is sensible to seek personalised fertility advice early.

What changes after 40 when trying to conceive?

Age-related changes in both egg quantity and egg quality are generally more significant after 40, which is one reason some people choose to seek fertility assessment sooner rather than waiting. This does not mean conception becomes impossible, but it does mean that time can matter more than it did at a younger age, and a fertility specialist can help clarify individual circumstances through appropriate testing. Nutrition, lifestyle and supplement choices can still be discussed and used as part of a broader plan alongside clinical care, but they do not remove or reverse the underlying effect of age on the ovaries. Our guide to CoQ10 and fertility after 40 looks at one nutrient that is often raised in this context. Anyone over 40 who is trying to conceive, or planning to, may benefit from an earlier conversation with a fertility clinic.

How long should I take supplements before IVF or egg freezing?

Some people begin reviewing their supplement routine in the months before IVF or egg freezing, reflecting the period over which follicles and eggs develop before treatment. This is not a universal rule, and the right timing for you will depend on your own treatment plan, so your fertility clinic should guide the specifics. It is worth checking your full routine with the clinic before you begin, particularly where prescribed fertility medication or higher-dose supplements are involved, since these need to be considered together rather than added separately. Starting earlier is not automatically better, and your clinical team is best placed to advise on what fits your individual protocol and timeline.

Should I take CoQ10 before IVF or egg freezing?

CoQ10 is commonly discussed in the context of fertility preparation because of its role in mitochondrial energy production, which is relevant to how cells, including eggs, function. It may be relevant for some people preparing for fertility treatment, particularly those thinking about age-related changes in fertility, though individual suitability varies. Whether CoQ10 is appropriate for you, which form to consider, and what amount might be discussed should be decided with a fertility specialist rather than chosen independently, especially close to treatment. Our guide to how much CoQ10 to take when trying to conceive covers some general considerations, but your clinical team can advise on your specific circumstances.

Is low AMH the same as poor egg quality?

No, low AMH is not the same as poor egg quality. AMH is commonly used as one marker of ovarian reserve, which relates to the number of eggs remaining rather than measuring their quality directly. Egg quality cannot currently be measured with a single blood test, so a low AMH result on its own does not tell you how your eggs are functioning. It is understandable to feel concerned about a low result, but it is best interpreted with a fertility specialist alongside your age, cycle history and other clinical findings, so that it is placed in the right context for your situation.

Are egg quality supplements safe to take with other medications?

Some supplements may interact with medications or may not be appropriate alongside a fertility treatment plan. Speak to your GP, pharmacist or fertility specialist before starting, stopping or combining supplements, particularly if you take prescription medication or are undergoing fertility treatment.

When should I speak to a fertility specialist?

It is worth speaking to a fertility specialist if you are 35 or over and have been trying to conceive for six months, or if you are over 40 and trying to conceive, since earlier assessment can be helpful at these stages. The same applies if you are preparing for IVF or egg freezing, so that your preparation can be tailored to your treatment plan. Irregular periods, known PCOS, endometriosis, previous fertility treatment, recurrent miscarriage or a low AMH result are also good reasons to seek personalised advice sooner rather than later. Reaching out earlier does not mean something is necessarily wrong; it simply means you can get clear, individual guidance in good time.

References

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