Egg quality depends on whether developing eggs have access to the nutritional building blocks required to grow, mature, and divide properly. At any given time, more than one egg is maturing simultaneously, each drawing on available nutrients to support its structure, energy needs, and genetic stability. This demand becomes even more pronounced during IVF, where multiple follicles are stimulated to mature at the same time, increasing the overall nutritional requirement placed on the body.
Those same nutrients are also required throughout the body for everyday functions such as energy production, tissue repair, immune activity, and stress response. Only when these baseline demands are adequately met can nutrients be made available to support reproduction. Here we will explore the key nutrients involved in supporting egg quality and what each one contributes as the egg develops.
Structural nutrients that build the egg cell
Structural nutrients provide the physical materials used to build the egg cell itself. As an egg develops, it must form a stable outer structure that protects its contents and allows communication with surrounding follicle cells. This structure is created from specific fats and phospholipids that are incorporated as the egg matures.
Foods such as egg yolks, liver, meat, poultry, and fish provide choline and related phospholipids that are used directly in building the egg’s outer structure. When intake is sufficient, the developing egg can draw on these materials as it matures.
Omega-3 fats include several forms. DHA is the form used directly in building the egg’s outer structure, and it is found mainly in oily fish such as tuna, salmon, and mackerel. The availability of these fats influences how stable and resilient the egg cell is as it develops.
Nutrients supporting energy production in the egg
As an egg develops, it requires a steady supply of energy to support growth, repair, and division. This energy is generated within the egg by processes that rely on specific nutrients to function effectively. If energy production is constrained, the egg’s ability to mature as it should can be affected.
B-vitamins are required to help convert food into usable energy, while magnesium supports many of the reactions involved in energy production. Iron is needed to support oxygen delivery, which is essential for efficient energy generation within the cell.
Co-enzyme Q10 also plays a role in cellular energy production. It is found in foods such as organ meats, particularly heart and liver, with smaller amounts in meat and some fish. Availability tends to decline with age and during periods when the body’s energy demands are high.
These nutrients are used continuously throughout the body to support muscles, the brain, and other high-energy tissues. When overall demand is high, fewer resources may be available to support developing eggs.
Nutrients supporting follicle signalling and egg maturation
As an egg develops, it does so within a follicle that must coordinate growth, hormone responsiveness, and timing. This process depends not only on structural materials and energy supply, but also on the signalling environment that guides how the egg matures over time.
Vitamin D plays a role in this signalling environment. It supports communication within the follicle and contributes to how developing eggs respond to hormonal cues during maturation. This includes involvement in AMH-related signalling, which helps regulate how follicles progress through early stages of development rather than advancing too quickly or unevenly.
Vitamin D also supports calcium-dependent processes within the egg and surrounding follicle cells. Calcium signalling is involved in egg maturation and later becomes essential for fertilisation and early cell division. When this signalling environment is supported, the egg is better able to complete the stages of development required before ovulation.
Because multiple eggs are developing at the same time — and even more so during IVF — Vitamin D availability during the months of follicle development influences not just how many eggs mature, but how well they mature. This helps explain why Vitamin D status is often more relevant during IVF preparation, when follicle signalling and synchrony are placed under greater demand.
Nutrients involved in DNA stability and cell division
As an egg develops, it must copy and divide its genetic material accurately. This process depends on a small group of nutrients that support DNA stability and orderly cell division. When these nutrients are limited, problems can arise that may show up later as unexplained infertility, failed implantation, or early miscarriage, even when standard test results appear normal.
Folate and vitamin B12 work together to support DNA formation and repair. This is why it is not recommended to take folic acid on its own. Folate is found in foods such as leafy greens, legumes, and liver, while vitamin B12 is found in animal foods including meat, fish, eggs, and dairy.
Zinc is a mineral that supports the structure of DNA and is involved in the many steps required for cell division. Good food sources include meat, shellfish, dairy, and seeds.
Selenium is also a mineral and plays a role in protecting genetic material during development. It is found in foods such as fish, seafood, meat, eggs, and Brazil nuts.
These nutrients are used throughout the body every day for cell renewal and repair. When overall demand is high, fewer resources may be available to support developing eggs. Consistent intake helps ensure that the materials needed for stable DNA and cell division are available during egg development.
Antioxidant nutrients supporting egg protection
As an egg develops, it needs protection from oxidative stress — a normal part of living in a body that is constantly producing energy. Oxidative stress increases during everyday situations such as stress, illness, inflammation, exposure to pollution, poor sleep, alcohol use, and even intense exercise. When this load builds up faster than the body can manage it, cells — including developing eggs — are more vulnerable to damage.
Antioxidant nutrients help limit this damage, protecting the egg as it matures.
Vitamin C supports antioxidant defence in the fluid surrounding the egg and helps regenerate other antioxidants once they have been used. It is found in foods such as citrus fruit, berries, peppers, and vegetables.
Vitamin E is a fat-soluble antioxidant that helps protect the egg’s outer structure from oxidative damage. It is found in foods such as nuts, seeds, plant oils, and some whole grains.
Copper is a mineral required for the body’s own antioxidant enzymes to function properly. These enzymes help neutralise oxidative stress inside cells. Copper is found in foods such as liver, shellfish, nuts, seeds, and cocoa.
Antioxidant nutrients are constantly being used throughout the body to protect cells from everyday wear and tear. When overall demand is high — through stress, inflammation, illness, or environmental exposure — fewer protective resources may be available to support developing eggs.
Egg quality reflects the materials available to the egg as it develops, and nutrition plays a central role in providing those materials over time. When key nutrients are consistently available, the egg is better supported in building its structure, producing energy, maintaining genetic stability, and protecting itself from oxidative stress. These foundations do not end at conception. The nutritional environment shaping egg quality also influences early embryonic development and the biological instructions passed forward into pregnancy and beyond, with implications for the long-term health of the child. Even so, nutrition does not act in isolation. Hormonal and thyroid signalling remain important in guiding how nutrients are allocated and used within the reproductive system, shaping how effectively nourishment is translated into egg quality.
