What Your Surgeon Isn't Telling You · Series · Fertility · IVF
A single IVF cycle costs upward of £5,000. The probability of success is substantially influenced by egg quality, sperm quality, uterine receptivity, and implantation capacity — all of which have documented nutritional dependencies. CoQ10, methylfolate, zinc, selenium, vitamin D, omega-3, and inositol are specific, measurable, correctable nutritional factors that influence IVF outcomes. No fertility clinic is assessing them before your cycle begins.
This series applies functional nutritional assessment to medical procedures where the biological outcome is substantially determined by nutritional status that nobody is measuring. Part 1 covered surgical and sports injury recovery. This post covers IVF and fertility. Subsequent posts will cover dental implants and oncology support.
I want to start with a number that should stop anyone in their tracks.
The live birth rate per IVF cycle in the UK for women under 35 is approximately 32%. For women aged 35–37 it drops to 25%. For women aged 38–39 it falls to 19%. For women aged 40–42, 11%. These are the Human Fertilisation and Embryology Authority (HFEA) figures — the most reliable dataset available.
These numbers mean that for the majority of women undergoing IVF, a single cycle will not result in a live birth. Many women go through multiple cycles — at £5,000 or more each — before achieving a pregnancy, or before deciding the emotional and financial cost is no longer sustainable.
The fertility industry knows these numbers. They are published, discussed, and disclosed. What is not disclosed — and not assessed — is the degree to which these probabilities are modified by individual nutritional status. Because the biological processes that determine IVF success — egg quality, follicular development, fertilisation, embryo development, implantation, early pregnancy maintenance — are all enzymatic processes requiring specific nutritional cofactors. And those cofactors vary enormously between individuals.
A woman going into an IVF cycle with optimal CoQ10 status, adequate methylfolate, replete zinc and selenium, optimal vitamin D, and sufficient omega-3 is not in the same biological position as a woman who is insufficient across all of these. The clinic treats them identically. The biology does not.
Egg quality is arguably the single most important factor in IVF success — more important than the stimulation protocol, more important than the laboratory conditions, and more important than most of the variables that fertility clinics spend time and money optimising.
What determines egg quality? The oocyte is the largest cell in the human body and one of the most metabolically demanding. It contains more mitochondria than any other cell type — because the energy requirements of meiosis (the cell division that produces the egg) and early embryonic development are extraordinary. The mitochondria in the egg must power the entire process of fertilisation and the first several days of embryonic development before the embryo's own genome activates.
Mitochondrial function is the key variable. And mitochondrial function is nutritionally dependent in specific and correctable ways.
CoQ10 (ubiquinol) is the rate-limiting cofactor for the mitochondrial electron transport chain — the process by which mitochondria produce ATP. Without adequate CoQ10, mitochondrial energy production is impaired. In the context of the oocyte, this means reduced ATP availability for meiosis, reduced energy for early embryonic development, and higher rates of chromosomal segregation errors — the primary cause of failed fertilisation, failed implantation, and early miscarriage.
CoQ10 levels in the body decline with age — which is one of the biochemical mechanisms underlying age-related decline in egg quality and IVF success rates. This is not simply an age story. It is a mitochondrial energy story — and CoQ10 is correctable.
Clinical evidence for CoQ10 supplementation in fertility is growing. A randomised controlled trial published in Fertility and Sterility (Bentov et al.) showed significant improvements in ovarian response, fertilisation rates, and embryo quality in women supplemented with CoQ10 compared to controls. The doses used were 600mg daily of ubiquinol — substantially higher than the 100–200mg found in most general supplements. Timing matters too: CoQ10 takes approximately 90 days to accumulate in ovarian tissue — the same timeframe as the follicular development cycle. Starting supplementation at least three months before a cycle is essential.
The MTHFR gene encodes methylenetetrahydrofolate reductase — the enzyme that converts dietary folate into the active form (5-methyltetrahydrofolate, or 5-MTHF) required for the methylation cycle. The methylation cycle is not a peripheral biochemical pathway. It is fundamental to DNA synthesis, DNA repair, gene expression, and the epigenetic programming of the developing embryo.
The two most common MTHFR variants — C677T and A1298C — are present in significant proportions of the population. C677T in its homozygous form reduces MTHFR enzyme activity by approximately 70%. Heterozygous C677T reduces activity by approximately 35%. These are not rare mutations. They are common polymorphisms with real consequences for anyone relying on folic acid supplementation to support fertility and early pregnancy.
The problem is that the standard advice — "take 400µg of folic acid before and during pregnancy" — assumes normal MTHFR function. For the 40% of people with reduced MTHFR activity, folic acid is poorly converted and may actually accumulate as unmetabolised folic acid — which has its own concerns including potential interference with folate receptor function and with the immune response to implantation.
The correct supplementation for MTHFR variants is methylfolate (5-MTHF) — the pre-activated form that bypasses the MTHFR step entirely. This is not an alternative medicine position. It is biochemistry. And yet most fertility clinics — and most GPs advising on pre-conception supplementation — are still recommending standard folic acid without asking whether the patient can actually convert it.
Homocysteine is the metabolic marker most relevant here. Elevated homocysteine is a downstream consequence of impaired methylation — and is independently associated with increased miscarriage risk, implantation failure, and adverse pregnancy outcomes. It is testable from a standard blood draw. It is not routinely checked in fertility workups.
Thyroid function is directly relevant to fertility — and is consistently under-investigated in both NHS and private fertility workups.
TSH above 2.5 mIU/L is associated with reduced IVF success rates, increased miscarriage risk, and impaired embryo development. The British Thyroid Association guidelines recommend TSH below 2.5 in women trying to conceive. Many NHS fertility clinics use the standard laboratory upper limit of 4.0 as their threshold — which means a woman with TSH of 3.8 may be told her thyroid is fine while carrying a meaningful fertility risk.
More importantly, thyroid antibodies — TPO and TgAb — are not routinely checked in fertility workups. Women with elevated thyroid antibodies (Hashimoto's) have significantly higher miscarriage rates and lower IVF success rates even when TSH is normal, because the autoimmune inflammation affects the uterine immune environment and endometrial function. Treating the antibody picture — with selenium, vitamin D, and where appropriate thyroid hormone support — improves outcomes. But you have to know the antibodies are elevated first.
Approximately 40–50% of fertility challenges involve a male factor. And yet the nutritional support conversation in fertility is almost entirely female-focused.
Sperm take approximately 74 days to develop. The nutritional environment during sperm production determines sperm count, motility, morphology, and DNA fragmentation. Sperm DNA integrity is increasingly recognised as a critical factor in IVF success and early pregnancy loss — and is substantially influenced by oxidative stress, which is nutritionally modifiable.
Systemic inflammation is an underappreciated driver of fertility challenges — both male and female.
Elevated inflammatory cytokines impair follicular development, reduce endometrial receptivity, and create a uterine immune environment less tolerant of implantation. The immune tolerance of implantation is a finely regulated process — the maternal immune system must accept a semi-foreign embryo without rejecting it. Chronic systemic inflammation dysregulates this process.
The gut microbiome is directly relevant here. The uterine microbiome — yes, the uterus has its own microbiome — is influenced by the gut microbiome, and its composition affects implantation success. A uterine microbiome dominated by Lactobacillus species is associated with higher IVF success rates. Dysbiotic uterine microbiomes are associated with implantation failure and recurrent miscarriage. The gut-uterine connection is real and clinically actionable.
Endometriosis — present in approximately 10% of women of reproductive age and significantly overrepresented in women with fertility challenges — is fundamentally an inflammatory condition. The inflammatory burden of endometriosis creates a hostile uterine environment for implantation and impairs egg quality via oxidative stress in follicular fluid. Nutritional anti-inflammatory support — omega-3, NAC, curcumin, vitamin D — is not a substitute for surgical management of endometriosis where indicated, but it addresses the inflammatory biology that drives the fertility impairment.
I want to be clear about what I'm not saying. Fertility clinics provide excellent medical care — the stimulation protocols, the embryology expertise, the monitoring, the surgical skill involved in egg collection and transfer are all genuinely sophisticated and important. The HFEA regulatory framework is robust. The medical side of IVF is well done.
What is not done is the nutritional preparation of the biological environment in which the procedure occurs. This is not a criticism of individual clinicians — it reflects the training, the time constraints, and the clinical framework within which fertility medicine operates. Nutritional assessment is simply not part of the fertility workup as currently structured.
The consequence is that two women undergoing identical IVF protocols — same stimulation doses, same laboratory, same transfer technique — may have very different outcomes based on the nutritional foundation they bring to the process. The clinic treats them identically. The biology does not.
A woman investing £5,000 in an IVF cycle deserves to know that the biological environment she's investing in has been optimised. That optimisation is not part of the fertility clinic's offering. It should be part of her preparation.
Everything in this post applies equally to women trying to conceive naturally, not just those undergoing IVF. The nutritional determinants of egg quality, uterine receptivity, and implantation are the same regardless of whether fertilisation happens in a laboratory or a fallopian tube.
The advantage of addressing this nutritionally is that the improvements — in egg quality, in endometrial receptivity, in inflammatory load, in thyroid function — are real improvements to the biological substrate of conception. They don't just improve IVF outcomes. They improve the probability of natural conception, reduce miscarriage risk, and support early pregnancy development regardless of how fertilisation occurs.
The three-month pre-conception window — the 90 days that correspond to the follicular development cycle — is when this work is most impactful. It is also the window that most couples spend in a state of hopeful waiting rather than active biological preparation.
Blood Chemistry — vitamin D, zinc, folate, B12, homocysteine, thyroid panel including antibodies, CRP, fasting insulin · DUTCH Plus — oestrogen, progesterone, cortisol pattern · GI-MAP — gut microbiome, inflammatory load, intestinal permeability · Methylation Profile — MTHFR and homocysteine in context
The DH Clinical Concierge can help you understand what a pre-conception nutritional assessment would look like for your specific picture — no appointment needed to start.
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