The One Thing That Improves Both Sperm and Eggs (And Most People Are Missing It)

When couples come to me struggling to conceive, one of the first things I look at is mitochondrial function. It sounds technical, but here's the short version: the energy-producing organelles inside your cells — mitochondria — are central to both egg and sperm quality in ways that most fertility treatment doesn't address. And the single most evidence-backed intervention for mitochondrial function in both partners is CoQ10.

"Mitochondria aren't just an energy detail. They determine whether your eggs and sperm have what they need to actually do the job."

Why Mitochondria Are Central to Fertility

Eggs are the most mitochondria-dense cells in the human body. This is not a coincidence — fertilization, the first cell divisions of a new embryo, and early development before the embryo's own genome activates all run entirely on maternal mitochondrial energy. When egg mitochondria are dysfunctional, eggs fail to complete meiosis correctly, fertilization rates drop, embryos arrest early, and chromosomal errors become more frequent. This is the primary mechanism of age-related egg quality decline.

Sperm also depend on mitochondria for motility — the flagellar movement that allows them to reach an egg. Mitochondria are packed into the midpiece of the sperm, specifically to power that movement. Poor mitochondrial function is a direct cause of reduced sperm motility, and it's also associated with increased sperm DNA fragmentation.

CoQ10: The Mitochondrial Cofactor

Coenzyme Q10 is the molecule that shuttles electrons in the mitochondrial energy production chain — essentially a required cofactor for cellular energy. Without adequate CoQ10, mitochondria can't produce ATP efficiently. CoQ10 declines with age, with statin use (a commonly overlooked drug interaction), and with oxidative stress.

For women, CoQ10 supplementation at therapeutic doses (600–1200mg/day of ubiquinol, the active form) has evidence for improving egg maturation rates, fertilization rates, and embryo quality — particularly in women over 35 or poor IVF responders. The mechanism is direct: replenishing the cofactor that egg mitochondria need to function.

For men, CoQ10 improves sperm motility and reduces DNA fragmentation through the same mitochondrial mechanism. Multiple controlled trials in men with poor semen parameters show meaningful improvements in motility and morphology with CoQ10 supplementation.

What Both Partners Should Be Doing

For women: ubiquinol (not ubiquinone — the active form) at 600–1200mg/day, started at minimum 90 days before your target cycle. Combined with antioxidants (vitamin C, vitamin E, selenium), folate (methylfolate if you have MTHFR), and vitamin D at optimal levels.

For men: ubiquinol at 400–600mg/day, alongside zinc, selenium, and vitamin C. L-carnitine is a complementary mitochondrial support supplement with specific evidence for sperm motility. Combined approach, 90 days minimum.

Conceivable builds both partners' protocols from their specific data — not a generic couples' package. The combination of personalized supplementation, the Halo Ring's continuous monitoring of your physiology, and Kai's coordination creates a system that targets the actual underlying factors in your specific picture.

Frequently Asked Questions

Is ubiquinol better than ubiquinone for fertility?

Yes — ubiquinol is the active, reduced form of CoQ10 that cells use directly. Ubiquinone (the oxidized form, found in most cheaper supplements) must be converted to ubiquinol before use. In younger, healthy people, this conversion happens reasonably efficiently. In older individuals and in people with impaired cellular function, conversion is less efficient, making ubiquinol the more reliable option. For fertility purposes, ubiquinol is recommended.

How long does it take for CoQ10 to improve egg quality?

The full benefit requires the complete egg development cycle — approximately 90 days from primordial follicle recruitment to mature ovulated egg. Improvements in IVF outcomes are typically seen when supplementation started at least 60–90 days before retrieval. Starting two weeks before a cycle does not provide meaningful egg quality benefit.

Can CoQ10 help with unexplained infertility?

Yes — mitochondrial dysfunction is frequently a contributing factor in "unexplained" infertility precisely because it's not measured by standard workups. Normal-looking eggs and embryos can have poor mitochondrial function that only becomes apparent when they fail to develop or implant. CoQ10's benefit in unexplained infertility is plausible through this mechanism, and the risk profile of supplementation is very low.

Does CoQ10 help with IVF specifically?

The best evidence for CoQ10 and fertility is specifically in IVF populations — particularly women over 38 and poor responders. Several studies show improved egg retrieval numbers, better fertilization rates, and higher blastocyst development rates with pre-cycle CoQ10 supplementation. The evidence is less robust for natural conception (harder to study), but the biological mechanism applies regardless of conception method.

What dose should my husband take?

For men with documented semen parameter issues, evidence-based doses are typically 300–600mg/day of ubiquinol. For men with relatively normal parameters who are optimizing proactively, the lower end (200–300mg) is a reasonable starting point. Sperm parameters should be retested after 90 days to assess response. Results vary by underlying cause — men with motility issues tend to show the most consistent response.

How does the Conceivable system actually work?

Conceivable combines three things: personalized supplement packs built from your quiz results and health data, an AI care team of 7 specialists (led by Kai, your fertility coordinator) who adjust your protocol as your body changes, and the Halo Ring for continuous biometric tracking. The system is built on 240,000+ clinical data points and 20 years of practice. It starts at $15/month.

How do I know which supplements I actually need?

Take the free 2-minute Conceivable quiz. It analyzes your cycle patterns, energy, stress, digestion, and health history to identify the specific nutrients your body needs — not a generic prenatal, but a protocol built for exactly where you are right now.

Do I need the Halo Ring to use Conceivable?

No. The Halo Ring is optional and adds continuous tracking of BBT, HRV, sleep, and blood glucose — which Kai uses to fine-tune your protocol in real time. But the personalized supplement packs and AI care team work without it. The ring is a one-time $250 purchase with no subscription required.

Written by Kirsten Karchmer, reproductive medicine practitioner with 25 years of clinical experience and 10,000+ credited pregnancies, and author of The Road to Better Fertility.