What to Do in the 90 Days Before IVF Retrieval
Why does IVF preparation actually start 90 days before retrieval, not the week before?
Eggs begin their final maturation roughly 90 days before retrieval, so the cellular environment — oxidative stress, mitochondrial function — during that window shapes egg quality before stimulation even starts. That is why the preparation worth doing, including anything your reproductive endocrinologist recommends, belongs in the three months ahead of the cycle rather than the week before it.
Most patients think of IVF preparation as something that begins when the stimulation medications start. But the biology of egg maturation means the most influenceable window actually opens about three months before that — and what happens during those 90 days can meaningfully shape the cycle everyone is focused on.
Why 90 Days Specifically
Eggs don't mature in the two weeks of a stimulation cycle alone. Follicles begin their final maturation process roughly 90 days before ovulation or retrieval, moving through stages of development that are influenced by the cellular environment — oxidative stress, mitochondrial function, hormonal signaling — throughout that entire window, not just in the final days before trigger. This is why "egg quality" isn't something a two-week stim protocol can fully determine on its own; a meaningful part of it was already being shaped three months earlier.
The Maturation Window: What's Actually Happening
During this window, the mitochondria inside developing eggs are accumulating the cellular machinery needed to later support fertilization and early embryo division. Mitochondrial density and function within the oocyte are directly tied to the energy (ATP) available for chromosome segregation and cell division after fertilization — and oxidative stress during this developmental window can impair that process. This is the biological rationale behind the "90-day rule" that comes up frequently in IVF preparation contexts: interventions aimed at supporting mitochondrial function and reducing oxidative stress have their best chance of meaningfully affecting the eggs that will actually be retrieved when started at the beginning of this window, not the week before.
What Has Real Evidence Behind It
CoQ10 is the most studied intervention in this space, and it's worth being precise about what the evidence actually shows rather than overselling it. A randomized controlled trial by Xu et al. (2018) found that CoQ10 pretreatment in young women with diminished ovarian reserve — dosed at 600mg/day for 60 days before stimulation — resulted in significantly better ovarian response, higher fertilization rates, more high-quality embryos, and fewer cancelled transfers due to poor embryo development compared to controls. Subsequent systematic reviews have found consistent associations between CoQ10 supplementation and improved endometrial thickness, antral follicle count, oocyte count, and clinical pregnancy rate.
That said, major professional bodies have been appropriately cautious: ESHRE guidelines note the evidence quality for live birth rate specifically — the outcome that matters most — is rated low to very low, and CoQ10 is not "routinely recommended" as a guaranteed intervention. The honest summary: CoQ10 has real, RCT-level evidence for improving intermediate outcomes (oocyte count, embryo quality, fertilization rate), particularly in women with diminished ovarian reserve or age-related decline, but it isn't a proven guarantee for the outcome patients care most about. It's a reasonable, low-risk addition for the right patient profile — not a required step for everyone, and not something to expect dramatic results from.
What to Actually Do in This Window
Start any supplementation early, not the week before your cycle. If CoQ10 or other antioxidant support makes sense for your case, starting at least 60-90 days before retrieval is what gives it a chance to actually be present during the relevant developmental window — starting during the stim cycle itself is largely too late to affect eggs that are already in their final maturation stages. That is the focus of IVF / IUI Support.
Address anything correctable in the metabolic and inflammatory picture. Thyroid function, insulin resistance, and systemic inflammation all plausibly affect the cellular environment eggs are developing within. This is the window to get labs checked and address anything abnormal, rather than starting stimulation with an unaddressed thyroid or metabolic issue in the background.
Coordinate timing with your REI here in Huntington rather than treating this as a separate, parallel track. If you're working with an acupuncturist, nutritionist, or integrative provider during this window, it's worth explicitly looping in your REI about timing — when your actual retrieval is scheduled, and what supplements or medications should be paused around trigger and retrieval (CoQ10, for instance, has mild blood-thinning properties and is often stopped 10-14 days before retrieval, or at trigger, depending on the clinic's protocol). This kind of coordination prevents any complementary care from working against, rather than alongside, your fertility team's plan. We go deeper into this in best supplements for egg quality in women over 40.
What to Fix First If Time Is Limited
If you don't have a full 90 days before your scheduled retrieval, starting late is still meaningfully better than not starting at all — CoQ10 levels in follicular fluid rise within weeks, not months, even if the full 90-day window offers the most complete benefit. Prioritize whichever correctable issue is most clearly abnormal on labs (thyroid, insulin resistance) first, since those tend to have a more direct, better-established connection to cycle outcomes than supplementation alone.
This article is for general educational purposes and isn't a substitute for individualized guidance from your reproductive endocrinologist. Supplement choices, dosing, and timing around retrieval should be confirmed directly with your IVF care team.
East to West Fertility, is a metabolic and immune-focused fertility practice in Huntington, NY, serving Long Island, NYC, and beyond. We work with patients during the pre-retrieval window to address the metabolic, thyroid, and cellular factors that influence egg quality, coordinating directly with your REI's timeline. Learn more about our Metabolic & Immune Fertility Evaluation at easttowestfertility.com or call 631-416-4940.
References:
Xu Y, Nisenblat V, Lu C, et al. "Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women with decreased ovarian reserve: a randomized controlled trial."
"Exploring the protective effects of coenzyme Q10 on female fertility." Frontiers in Cell and Developmental Biology, 2025.
"The Impact of CoQ10 on IVF Outcomes: A Systematic Review." Journal of Sexual Medicine.
