More women than ever are starting or growing their families after 35. Whether that's been a conscious choice, a matter of circumstance, or simply the way life unfolded, you're not alone, and you're far from out of options.
What you do deserve, though, is honest, science-led information. Not the kind that sends you spiralling at 2am, and not the kind that glosses over the realities either. The truth sits somewhere more nuanced and, frankly, more hopeful than most of what you'll find online.
What Actually Changes After 35
The phrase "fertility declines after 35" gets thrown around so often it's almost lost it's meaning. But understanding what is actually changing and why puts you in a much stronger position than a statistic ever could.
Egg quantity and quality
You were born with all the eggs you'll ever have around one to two million to be exact. By puberty that number has already fallen to roughly 300,000, and by your mid-thirties, both the number and the quality of remaining eggs have declined further. This isn't cause for panic; it's simply biology.
What matters more than quantity, for most women, is quality. Egg quality refers to whether an egg has the right chromosomal makeup to be fertilised, develop into a healthy embryo, and result in a successful pregnancy. As eggs age, the likelihood of chromosomal abnormalities increases, which is the primary reason miscarriage rates rise and conception can take longer after 35.
Mitochondrial function
This is where nutrition becomes genuinely powerful. Eggs are among the most mitochondria-rich cells in the human body, mitochondria being the energy-producing structures inside every cell. The energy produced by mitochondria is essential for the process of cell division that happens in the early days after fertilisation.
As we age, mitochondrial function naturally declines. But research increasingly shows that certain nutrients, CoQ10 in particular can support mitochondrial energy production in eggs, which is why it has become one of the most researched nutrients in the field of reproductive medicine.
Hormonal shifts
After 35, levels of FSH (follicle-stimulating hormone) often begin to rise, as the body works harder to stimulate egg development. AMH (anti-Müllerian hormone), which gives an indication of ovarian reserve, tends to decline. Neither of these is a definitive measure of fertility, but they're useful data points if you're working with a GP or fertility specialist.
The luteal phase
The luteal phase is the second half of your cycle, after ovulation and before your period. Progesterone, which supports the uterine lining and is essential for a fertilised egg to implant, can become less robust with age. This is one reason why supporting overall hormonal health through nutrition matters.
The 90-Day Window You Should Know About
Here's something that changes how most women think about preconception health: the egg you ovulate this month began its development roughly 90 days ago.
The follicular phase, the period during which an egg matures before ovulation takes approximately three months. During that entire window, the egg is sensitive to the nutritional environment inside your body. What you're eating, the supplements you're taking, your stress levels and sleep, all of it is influencing egg quality in real time, three months before ovulation even happens.
This is why starting preconception nutrition before you're ready to try isn't premature, it's strategic.
What You Can Do: The Nutrition Foundations
Folate and why the form matters
You've likely heard that folic acid is essential before and during early pregnancy. What's less widely discussed is that a significant proportion of women carry a variation in the MTHFR gene that affects their ability to convert synthetic folic acid into the active form the body can actually use.
Active folate known as 5-MTHF bypasses this conversion step entirely. For women over 35, where optimising every aspect of preconception health matters, choosing a supplement that contains 5-MTHF rather than basic folic acid is a meaningful upgrade.
CoQ10
Coenzyme Q10 is arguably the most researched supplement in the context of female fertility over 35. Its role in supporting mitochondrial function in eggs is well-documented, and several studies have explored its potential to support egg quality, particularly in older women.
CoQ10 levels in the body naturally decline with age, which is precisely why supplementation becomes more relevant after 35. Dosage and form matter here, look for a supplement that provides a meaningful amount rather than a token inclusion.
Choline
Choline is chronically under-discussed in the preconception conversation. It plays a critical role in early embryonic development, supports neural tube development alongside folate, and most women don't get close to sufficient amounts through diet alone.
Zinc
Zinc is involved in virtually every stage of the female reproductive cycle from follicle development and ovulation through to fertilisation and early embryo development. Deficiency, even mild deficiency, can impact cycle regularity and egg quality.
Iodine
Iodine is essential for thyroid function and thyroid health has a direct and significant impact on fertility, cycle regularity and early pregnancy. Iodine deficiency is more common in the UK than most people realise.
Vitamin B6
B6 supports hormonal balance, particularly in the luteal phase, and plays a role in reducing elevated homocysteine levels high homocysteine has been associated with poorer reproductive outcomes.
Lifestyle: The Factors That Move the Needle
Sleep
Melatonin produced during sleep is a potent antioxidant that protects eggs from oxidative stress. Consistently poor sleep isn't just exhausting; it has a measurable impact on reproductive health. Prioritising seven to nine hours isn't indulgent, it's functional.
Stress
Chronic stress elevates cortisol, which can disrupt the hormonal cascade required for regular ovulation. This doesn't mean stress causes infertility but it does mean that finding sustainable ways to manage it is genuinely part of the preconception picture.
Alcohol
The research here is fairly consistent: even moderate alcohol consumption can affect egg quality and reduce the chances of conception. Most fertility specialists recommend cutting it out entirely during the preconception period, particularly after 35.
Movement
Regular, moderate exercise supports hormonal balance, circulation and a healthy weight all of which influence fertility. The key word is moderate; very high-intensity training can suppress ovulation in some women.
When to Seek Professional Support
If you're 35 or over and have been trying to conceive for six months without success, current guidance recommends speaking to your GP rather than waiting the full twelve months advised for younger women. This isn't cause for alarm it's simply a sensible use of the time available to you.
A good starting point is asking your GP for:
• A day 21 progesterone test (to confirm ovulation)
• FSH and LH levels (on day 2–5 of your cycle)
• AMH (ovarian reserve this may require a referral or private test)
• Thyroid function (TSH, T3, T4)
• A semen analysis for your partner
Getting this baseline picture gives you and any specialist you work with real information to act on.
The Bottom Line
Trying to conceive after 35 is not a race against a cliff edge. It is, however, a moment where being informed and intentional about your health pays real dividends. Understanding what's happening in your body, supporting it with the right nutrition, and knowing when to seek professional input puts you in the strongest possible position.
The biology is real. So is the opportunity to support it.
Frequently Asked Questions
Does fertility really drop sharply at 35?
The idea of a dramatic cliff edge at 35 is something of a myth. Fertility does decline gradually from the late twenties onwards, with the pace increasing after 35 and more noticeably after 40. Many women conceive naturally in their late thirties, the key is understanding your individual picture rather than relying on averages.
What supplements should I take when trying to conceive after 35?
The most evidence-supported nutrients for women over 35 trying to conceive include active folate (5-MTHF), CoQ10, choline, zinc, iodine and vitamin B6. A comprehensive, high-strength formulation designed specifically for this life stage is preferable to a standard prenatal vitamin.
How long should I take preconception supplements before trying?
Ideally, at least three months before you start trying aligned with the 90-day follicular development window. Starting earlier gives nutrients time to reach optimal levels and to influence egg quality during the full maturation cycle.
Is CoQ10 worth taking for fertility?
CoQ10 is one of the most studied nutrients in the context of female fertility, particularly for women over 35. It supports mitochondrial energy production in eggs, and levels naturally decline with age making supplementation increasingly relevant as you get older.
When should I see a doctor if I'm over 35 and trying to conceive?
Current guidance recommends speaking to your GP after six months of trying if you're 35 or over, rather than the twelve months advised for younger women. Earlier, if you have any known health conditions affecting fertility, cycle irregularities, or concerns.
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.