How Long Do Preconception Supplements Take to Work?

There's a question that comes up in almost every conversation about preconception nutrition, and it usually sounds something like this:

"I just started taking this supplement, I wonder how long until it actually does something?"

It's a completely fair question. You're investing time, money and mental energy into your preconception routine, and you want to know when that effort starts to pay off.

The honest answer is rooted in some genuinely fascinating biology - and once you understand it, the "why start early?" advice starts making sense.

The short answer

Most preconception supplements - particularly antioxidants and nutrients that support the health of female gametes (i.e. our eggs!) are generally recommended for a minimum of 90 days, or around 3 months, before you're hoping to conceive, undergo egg retrieval, or freeze eggs.

That's not an arbitrary number. It maps directly onto the biology of how eggs develop in your body.

Why 90 days? The biology of egg development

Here's something that surprises a lot of people: while you're born with all the eggs you'll ever have, those eggs don't just sit there, fully formed and waiting. Each egg goes through a final maturation process before it's ovulated or retrieved - and that process takes roughly 90 to 120 days.

During this window, the follicle surrounding your egg grows significantly - the follicle becomes like a little sac that houses the egg. Supporting cells multiply. The follicle fills with fluid that nourishes the developing egg. And critically, the environment that egg matures in - your nutritional status, antioxidant levels, oxidative stress load - is being shaped in real time.

Which means: the egg you ovulate (or collect at retrieval) today reflects the internal environment of the past three to four months of your life.

This is why we're so focused on the preconception window at arxi, and why we wrote an entire guide on what preconception actually means - because it reframes preparation from a last-minute scramble into a meaningful, science-backed lead time.

→ Read more: What Does Preconception Really Mean?

So do supplements "kick in" after 90 days?

Not exactly. Supplements aren't like a slow-release switch that flips on at the three-month mark. What's actually happening is more gradual.

When you start taking a preconception antioxidant supplement, your body begins using those nutrients from day one. Levels of certain compounds build up in your tissues over time. Mitochondria - the energy powerhouses inside your cells - have the building blocks they need to function well.

The key insight is that your body is getting ready for conception before you even decide to start trying. By the time you're thinking hard about conception or retrieval, the eggs heading toward ovulation have been developing for months.

In practical terms: starting your supplement routine earlier means those nutrients are present and working throughout that preconception window, not just at the end of it.

Does this mean it's too late if I have less than 3 months?

No. And this is important.

Just because eggs (and sperm for that matter) do take a few months to fully reach maturity, doesn't mean starting later is pointless. Starting now - even with 6 weeks to go, or 4 weeks - still supports your nutritional status, still contributes to antioxidant defence, and still matters. The best time to start is the time you actually have.

As we cover in our IVF prep timeline, if your egg collection is less than 3 months away, the approach is the same: start now, be consistent, and focus on what's within your control.

→ Read more: IVF Prep Timeline: What To Do In The 3 Months Before Egg Collection

What about different types of supplements? Do they all take the same time to have an effect?

Not all supplements work on the same timeline, and it's worth understanding the differences.

Antioxidants (CoQ10, Vitamin E, Alpha Lipoic Acid, Vitamin C)

These nutrients work by reducing oxidative stress and supporting the environment that cells develop in. Because their potential is tied to the preconception window, around 3 months supplementation is a good target.

CoQ10 is the most extensively studied preconception antioxidant, and the research gives us some useful concrete numbers.

A 2025 review (Jiang et al.) synthesised multiple clinical studies and outlined different protocols depending on circumstances. Studies reporting positive outcomes used CoQ10 supplementation for as little as 30 days to over 3 months. For example, in a group of women with normal ovarian reserve preparing for a standard IVF cycle, oral CoQ10 at 200 mg/day for 30-35 days prior to ovarian stimulation was shown to increase CoQ10 levels in follicular fluid (Giannubilo et al., 2018).

For most people approaching preconception generally, the 3-month window represents the more comprehensive end of the evidence base, and aligns most closely with the egg maturation timeline.

NAD+ precursors (like Nicotinamide Riboside)

NAD+ plays a central role in mitochondrial energy production, which is critical for healthy cell growth and development. Consistent intake over weeks is recommended; ideally again covering the 3 month preconception window.

Folate / Folic Acid

The recommendation to start folate at least one month before trying to conceive is well established; it's about having adequate levels present at the time of conception and in very early pregnancy, when neural tube formation occurs. This has a slightly different rationale to the antioxidants above, but the principle of starting early is the same.

Vitamin D

If you have a deficiency, correcting it can take several months of consistent supplementation - which is a good reason to get your levels checked and start supplementing sooner rather than later if needed.

Iron

The same goes for iron supplements. If you have iron deficiency, correcting it through oral supplements can take several months of consistent capsule-taking. If you’re preparing for pregnancy, please get your iron studies checked and start supplementing sooner rather than later if needed.

The pattern across all of them: earlier and more consistent is better than later and sporadic.

Can I see results sooner?

Possibly. Some people notice changes in energy levels or general wellbeing within the first few weeks of starting a comprehensive supplement routine - though this varies a lot depending on your baseline nutritional status and individual response.

It's worth being realistic, though: the core goal of preconception antioxidant support isn't an overnight fix. It's about building and maintaining the right internal conditions over a meaningful stretch of time. 

Frequently asked questions

How long should I take preconception supplements before trying to conceive?

At least 3 months (90 days) is the most evidence-informed recommendation for antioxidant supplements. Folate is typically recommended for at least 1 month before conception, though starting earlier is preferable. If you're unsure what's right for your situation, a dietitian or your GP can help tailor this to your circumstances.

Should I take preconception supplements every day, or is it okay to skip days?

Consistency matters more than perfection, but daily intake is what's recommended. Many of the nutrients involved build up in your tissues over time with consistent use. Sporadic intake is less effective than a steady daily routine.

When should I stop taking preconception supplements?

This depends on the supplement and your situation. OvaGold is designed specifically for the preconception window - we advise to stop once you confirm pregnancy, as some ingredients aren't intended for use during pregnancy. Your prenatal multivitamin, however, should continue. Your healthcare provider can advise based on your specific protocol, particularly if you're going through IVF.

Can I take a preconception supplement and a prenatal vitamin at the same time?

In most cases, yes - they're designed to work together, not replace each other. A prenatal covers the foundational nutrients (folate, iodine, iron) that are critical during early pregnancy. OvaGold is targeted specifically at preconception antioxidant support, intended to complement your prenatal, not duplicate it. As always, check with your healthcare provider if you're on other medications or have specific health considerations.

Does the 3-month rule apply to egg freezing too?

Yes - the same biology applies. Eggs collected during an egg freezing cycle have been maturing for months before retrieval, so the preconception window is just as relevant for egg freezing as for natural conception or IVF. If you're planning an egg freezing cycle, starting your supplement routine around 3 months before your intended retrieval date is the ideal approach.

What if I've been trying to conceive for a while and haven't started supplements yet?

Start now. There's no benefit to waiting until you have a "perfect" 3-month runway. What matters is consistency from whatever point you begin. If you've been trying for 12 months or more without success, it's also worth booking an appointment with your GP or a fertility specialist to explore what else might be going on - supplements support reproductive health, but they're not a substitute for medical advice or investigation.

The bottom line

Preconception supplements - especially antioxidants - work best when they're given time to work. The 90-day window isn't marketing; it's the timeline your biological processes follow. By starting your routine earlier, you give those nutrients the opportunity to support your body.

Start from day zero.

Just a heads up: This article is for general informational purposes only and does not constitute medical advice. Always consult your healthcare team before starting or changing any supplement routine.

References

Giannubilo SR, Orlando P, Silvestri S, Cirilli I, Marcheggiani F, Ciavattini A, Tiano L. CoQ10 supplementation in patients undergoing IVF-ET: the relationship with follicular fluid content and oocyte maturity. Antioxidants (Basel). 2018 Oct 13;7(10):141. doi: 10.3390/antiox7100141. PMID: 30322142.

Jiang Y, Han Y, Qiao P, Ren F. Exploring the protective effects of coenzyme Q10 on female fertility. Front Cell Dev Biol. 2025 Aug 29;13:1633166. doi: 10.3389/fcell.2025.1633166.

Qi S, Liang Q, Yang L, Zhou X, Chen K, Wen J. Effect of Coenzyme Q10 and transcutaneous electrical acupoint stimulation in assisted reproductive technology: a retrospective controlled study. Reprod Biol Endocrinol. 2022 Dec 8;20(1):167. doi: 10.1186/s12958-022-01043-9. PMID: 36476305.

Xu Y, Nisenblat V, Lu C, Li R, Qiao J, Zhen X, Wang S. Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women with decreased ovarian reserve: a randomized controlled trial. Reprod Biol Endocrinol. 2018 Mar 27;16(1):29. doi: 10.1186/s12958-018-0343-0. PMID: 29587861.

Stephenson J, Heslehurst N, Hall J, Schoenaker DAJM, Hutchinson J, Cade JE, Poston L, Barrett G, Crozier SR, Barker M, Kumaran K, Yajnik CS, Baird J, Mishra GD. Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health. Lancet. 2018 May 5;391(10132):1830-1841. doi: 10.1016/S0140-6736(18)30311-8.