Egg quality refers to how well an egg can mature, fertilize, and develop into a healthy embryo — and it comes down largely to mitochondrial function and chromosomal integrity. It is not the same as egg quantity. You can have a good ovarian reserve and still struggle with quality, or a low reserve with eggs that fertilize beautifully. Quantity is largely fixed. Quality is the part that responds, at least somewhat, to what you do.
An egg takes roughly 90 days to complete its final maturation before it is released. During that window it is metabolically active and drawing on mitochondrial energy — which is why the supplement research consistently uses a two-to-three-month runway rather than measuring effects within a single cycle.
Practically, that means if you are planning an IVF retrieval or starting to try, the useful time to begin is about three months out. If you are already trying, start now. Consistency over months matters more than perfect timing.
CoQ10 has the strongest evidence base of anything in this collection, and it is worth being precise about what that evidence shows. A 2018 randomized controlled trial in young women with diminished ovarian reserve found that CoQ10 pretreatment produced more retrieved oocytes, higher fertilization rates, and more high-quality embryos than control. A 2024 systematic review and meta-analysis in Annals of Medicine, pooling six RCTs and 1,529 participants with diminished ovarian reserve, reached consistent conclusions. Mechanistically, a 2025 review in Frontiers in Cell and Developmental Biology describes CoQ10 acting through mitochondrial pathways and reduced oxidative stress in the oocyte.
Here is the honest caveat, and it matters: most of that research was conducted in women with diminished ovarian reserve, often over 35, usually in an IVF or ICSI setting. It is weaker evidence for a 28-year-old with normal reserve trying naturally. CoQ10 does not create new eggs. It appears to support the function of the eggs you already have.
As a nurse practitioner, I look for three things. First, form — ubiquinol is the reduced, more bioavailable form of CoQ10, and it matters more as you get older. Second, dose — the trials generally used 200–600 mg daily, so a product delivering 30 mg is not going to replicate those results. Third, what else is in the bottle: methylated folate rather than synthetic folic acid, and myo-inositol if you have PCOS or irregular cycles.
One more thing worth saying plainly. Supplements are the most controllable part of a process that mostly is not controllable, which is exactly why they attract so much anxious attention. They are worth doing. They are not the whole picture, and taking the perfect protocol does not mean you did everything right or that a difficult outcome was your fault.
If you want the fuller picture, Mindy's guide on preparing your body for pregnancy covers supplements alongside lifestyle and emotional readiness, and the complete fertility essentials collection includes tracking tools and IVF support.
CoQ10 (ideally as ubiquinol) has the strongest research support, typically at 200–600 mg daily. Myo-inositol is well studied for cycle regularity and ovulation, particularly in PCOS. Methylated folate, vitamin D, and antioxidants like NAC and vitamin E are commonly included in preconception formulas. No supplement increases the number of eggs you have — these support the quality and function of existing eggs.
Plan on about three months. Eggs take roughly 90 days to complete final maturation before ovulation, so supplements need that runway to influence the eggs you will actually release. Most clinical trials use a 60- to 90-day pretreatment period. If you are preparing for IVF, starting three months before retrieval is the standard recommendation.
The evidence is genuinely promising but specific. Randomized controlled trials and a 2024 meta-analysis of six RCTs found improved oocyte retrieval, fertilization rates, and embryo quality in women with diminished ovarian reserve undergoing IVF. That research population matters — the benefit is best demonstrated in women over 35 or with reduced reserve, and less established for younger women with normal reserve.
Ubiquinol is the reduced, active form of CoQ10. Your body converts standard CoQ10 (ubiquinone) into ubiquinol before using it, and that conversion becomes less efficient with age. If you are over 35, ubiquinol is generally the better choice despite the higher price. Below 35, standard CoQ10 at an adequate dose is usually sufficient.
Egg quality declines with age and no supplement reverses that. What the research suggests is that mitochondrial support may help existing eggs perform closer to their potential — which is meaningful, but different from turning back the clock. Women over 40 are also the population where CoQ10 trials have shown the clearest effects. Talk with a reproductive endocrinologist about realistic expectations for your situation.
Often yes, but watch for overlap. Several preconception formulas already contain CoQ10, inositol, and folate, so stacking them with standalone versions can push you past intended doses. Bring every bottle to your provider appointment so the combined amounts can be reviewed — especially if you have thyroid conditions, PCOS, or are taking blood thinners, which can interact with CoQ10.
This collection contains affiliate links, which means we may receive a small commission, at no cost to you, if you make a purchase through the link. We only recommend products we trust and believe will be beneficial to our readers.
The content on Awaiting the Stork™ is for informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult with a qualified physician or healthcare professional to address your unique health needs and circumstances.
