There's a particular kind of exhaustion that comes with trying to conceive for a long time. It's not just physical. It's the monthly cycle of hope and disappointment. The mental gymnastics of symptom-spotting. The way it starts to quietly colour everything, relationships, work, weekends, other people's announcements.
If you're reading this, you probably know exactly what that feels like.
This piece isn't going to tell you to relax, or that it'll happen when you stop thinking about it. What it will do is give you clear, honest information: what the medical system can offer you at this point, what questions to ask, and how optimising your nutritional foundation can genuinely support your body whatever path lies ahead.
First: What the Timeline Actually Means
The clinical definition of infertility is twelve months of regular, unprotected sex without conception or six months if you're 35 or over. Reaching that marker doesn't mean something is definitively wrong. It means you now have access to a more thorough level of investigation, and that it's time to use it.
Around one in seven UK couples experience difficulty conceiving. Of those, roughly a third of cases relate to female factors, a third to male factors, and a third to a combination of both or remain unexplained. That last category, unexplained infertility, is more common than most people realise, and it's one of the reasons that optimising your overall health and nutritional status matters so much at this stage.
The Medical Conversations Worth Having
If you haven't already spoken to your GP, now is the time. You're entitled to investigation and support, and knowing what to ask for makes those appointments considerably more useful.
For women, the key tests to request:
Day 2–5 hormone panel
This includes FSH (follicle-stimulating hormone), LH (luteinising hormone) and oestradiol. Together they give a picture of how your ovaries are responding and whether ovulation is likely occurring normally.
Day 21 progesterone
This test is taken seven days after ovulation, which may not be day 21 (as it can vary) but if your cycle is irregular this will confirm whether ovulation has actually occurred. It's one of the most important and most commonly missed tests in early fertility investigation.
AMH (anti-Müllerian hormone)
AMH gives an indication of ovarian reserve, the remaining pool of eggs. It won't tell you definitively whether you can conceive, but it helps paint a fuller picture and guides decisions about timing and next steps.
Thyroid function
TSH, T3 and T4. Thyroid dysfunction, even subclinical hypothyroidism can significantly affect ovulation, cycle regularity and the ability to sustain a pregnancy. It's surprisingly common and surprisingly underdiagnosed in the context of fertility.
Pelvic ultrasound
To assess the uterus and ovaries, check for conditions such as polycystic ovary syndrome (PCOS) or fibroids, and evaluate antral follicle count as another marker of ovarian reserve.
For your partner:
A semen analysis is the single most important test at this stage and one that's often delayed far longer than it should be. It's non-invasive, quick, and can be arranged through your GP. Sperm parameters count, motility and morphology which can account for a significant proportion of fertility challenges, and knowing this early shapes everything that follows.
What to Do If Results Come Back Normal
Unexplained infertility is one of the more difficult diagnoses to sit with because without a clear cause, it can feel like there's nothing to act on. In reality, the opposite is true.
When there's no identified structural or hormonal issue, the focus shifts to optimising the conditions for conception: egg quality, sperm quality, hormonal balance, uterine environment. This is where lifestyle and nutrition do their most meaningful work.
Why Nutritional Status Matters More at This Stage
After twelve months of trying, your body has been through twelve cycles of hormonal fluctuation, ovulation and either implantation attempts or menstruation. That is a significant physiological demand and one that depletes certain nutrients faster than normal.
Active Folate (5-MTHF)
Folate is essential not just for preventing neural tube defects but for DNA synthesis, cell division and the development of a healthy embryo from the very first moments of fertilisation. The active form, 5-MTHF, is significantly more bioavailable than synthetic folic acid and bypasses the conversion issues that affect a substantial proportion of women due to MTHFR gene variants.
CoQ10
Coenzyme Q10 sits at the centre of mitochondrial energy production and eggs are extraordinarily energy-demanding cells. The process of meiosis requires enormous amounts of mitochondrial energy. CoQ10 supports that process directly. Research into CoQ10 and female fertility has grown substantially over the past decade, with particular focus on its relevance for women who have been trying for an extended period.
Choline
Choline supports neural tube development alongside folate, plays a role in cell membrane integrity, and is involved in early embryonic development in ways that are still being fully understood. It's also one of the nutrients most systematically under-represented in standard prenatal vitamins and most commonly deficient in women of reproductive age.
Zinc
Zinc is involved in follicle development, ovulation, fertilisation and the early stages of embryo development. It also plays a critical role in immune function relevant because the implantation process involves a carefully calibrated immune response in the uterine lining.
Iodine
Iodine deficiency in the UK is more prevalent than most people realise, and its impact on fertility is direct: iodine is essential for thyroid hormone production, and thyroid health underpins hormonal balance across the entire reproductive cycle.
Vitamin B6
B6 supports progesterone production and luteal phase health. It also helps regulate homocysteine levels; elevated homocysteine has been associated with poorer reproductive outcomes and is more common in women with MTHFR variants.
Vitamin D
Vitamin D receptors are found throughout the female reproductive system. Low vitamin D levels have been associated with reduced ovarian reserve and poorer IVF outcomes. In the UK, where sunlight is unreliable for much of the year, deficiency is extremely common and worth testing for specifically.
Supporting Your Partner's Fertility Too
Sperm quality is affected by many of the same nutritional factors as egg quality and sperm are produced continuously, on a roughly 74-day cycle. Nutritional improvements can translate into meaningfully better sperm parameters within a few months.
Key nutrients for sperm health include zinc, selenium, vitamin C, vitamin E, CoQ10 and folate. Lifestyle factors particularly smoking, alcohol, heat exposure and chronic stress have a well-documented negative impact on sperm count, motility and morphology.
The Emotional Weight and Why It's Worth Naming
Twelve months of trying carries an emotional load that is genuinely significant and rarely adequately acknowledged. The grief of each unsuccessful cycle is real. The strain on relationships is real. The impact on mental health is real and well-documented in the research.
If you're struggling emotionally, that's not weakness it's a completely understandable response to a genuinely difficult experience. Fertility counselling, whether accessed privately or through your GP, can be profoundly useful at this stage.
Looking Ahead: What Comes Next
If you're moving into assisted conception, the nutritional foundations discussed here remain directly relevant. In fact, the evidence for CoQ10, active folate, choline and comprehensive micronutrient support is arguably strongest in the context of assisted reproduction.
The path forward may not yet be clear. But being as well-prepared as possible physically and nutritionally means you're not standing still.
Frequently Asked Questions
How long should I try before seeing a doctor about fertility?
Current NHS guidance recommends speaking to your GP after twelve months of regular, unprotected sex without conception — or after six months if you're 35 or over.
What tests should I ask for after 12 months of trying to conceive?
Key tests include a day 2–5 hormone panel (FSH, LH, oestradiol), a day 21 progesterone test, AMH, thyroid function, and a pelvic ultrasound. Your partner should have a semen analysis at the same time.
What does unexplained infertility mean?
Unexplained infertility is diagnosed when standard investigations don't identify a clear cause. It accounts for a significant proportion of fertility diagnoses and doesn't mean nothing can be done optimising nutrition, lifestyle and overall health remains highly relevant.
Can supplements really make a difference after 12 months of trying?
The evidence for certain nutrients particularly CoQ10, active folate (5-MTHF), choline, zinc and iodine in supporting egg quality, hormonal balance and the conditions for conception is substantial and growing.
Should my partner also be taking supplements?
Yes. Male fertility accounts for around a third of fertility challenges, and sperm quality responds to nutritional and lifestyle improvements within the 74-day sperm production cycle.
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before beginning any new supplement regimen.