CoQ10 (Coenzyme Q10): Fertility Use
CoQ10 (coenzyme Q10) is a natural nutrient that helps cells make energy. It is fat-soluble. It also works as an antioxidant, a substance that helps protect cells from damage. The nutrient is a key part of energy production in mitochondria, the structures inside each cell that make energy. When couples ask about CoQ10 for fertility, they are asking an energy question. Do the egg and the sperm have enough energy to join and develop into an early embryo?1
The CoQ10 level in a woman's eggs declines with age.2 Animal studies and small human studies link low CoQ10 in the egg to lower energy output.32 Researchers think this energy shortfall may lead to more errors when the egg divides its chromosomes. These errors can leave an egg with the wrong number of chromosomes (aneuploidy). Aneuploidy is part of the reason egg quality declines with age. Research on CoQ10 and egg quality centers on this idea. The egg needs a large amount of energy to finish dividing. Too little energy may raise the chance of errors.42
The male partner matters here as well. Several studies link the CoQ10 level in semen to sperm count and to sperm motility, the ability of sperm to move.5 In a number of groups, CoQ10 supplements improved semen results and lowered markers of oxidative stress. Oxidative stress is cell damage from unstable oxygen molecules. These findings give both partners a parallel reason to consider CoQ10 during evaluation.67
Does CoQ10 help with fertility? For some couples, CoQ10 is a reasonable part of evaluation before pregnancy. This applies most when oxidative stress or age-related energy decline is part of the clinical picture.8 The strongest case rests on how CoQ10 works. It supports the energy that eggs and sperm rely on. In several trials, it improved sperm motility and other measures of sperm quality.6 Results for eggs and embryos are smaller and more mixed.93 Large trials have not yet shown whether this benefit leads to more pregnancies. Most human studies track laboratory measures rather than live births.9 RRM clinicians often regard CoQ10 as one part of antioxidant support rather than a stand-alone remedy. Evaluation includes both partners. Any supplement plan follows each couple's own findings rather than a uniform dosing guide.
Cited in this entry
- Van Blerkom J Mitochondrial function in the human oocyte and embryo and their role in developmental competence. Mitochondrion. 2011. https://pubmed.ncbi.nlm.nih.gov/20933103/
- Ben-Meir A, Burstein E, Borrego-Alvarez A, Chong J, Wong E, Yavorska T et al. Coenzyme Q10 restores oocyte mitochondrial function and fertility during reproductive aging. Aging cell. 2015. https://pubmed.ncbi.nlm.nih.gov/26111777/
- Bentov Y, Casper RF The aging oocyte--can mitochondrial function be improved?. Fertility and sterility. 2013. https://pubmed.ncbi.nlm.nih.gov/23273985/
- Van Blerkom J Mitochondria in human oogenesis and preimplantation embryogenesis: engines of metabolism, ionic regulation and developmental competence. Reproduction (Cambridge, England). 2004. https://pubmed.ncbi.nlm.nih.gov/15333778/
- Balercia G, Arnaldi G, Fazioli F, Serresi M, Alleva R, Mancini A et al. Coenzyme Q10 levels in idiopathic and varicocele-associated asthenozoospermia. Andrologia. 2002. https://pubmed.ncbi.nlm.nih.gov/11966577/
- Balercia G, Buldreghini E, Vignini A, Tiano L, Paggi F, Amoroso S et al. Coenzyme Q10 treatment in infertile men with idiopathic asthenozoospermia: a placebo-controlled, double-blind randomized trial. Fertility and sterility. 2009. https://pubmed.ncbi.nlm.nih.gov/18395716/
- Derbyshire EJ, Ostojic SM, Alahmar AT Ubiquinol in Fertility and Reproduction: A Conditionally Essential Nutrient for Critical Early-Life Stages. Nutrients. 2026. https://pubmed.ncbi.nlm.nih.gov/41515272/
- Shang Y, Song N, He R, Wu M Antioxidants and Fertility in Women with Ovarian Aging: A Systematic Review and Meta-Analysis. Advances in nutrition (Bethesda, Md.). 2024. https://pubmed.ncbi.nlm.nih.gov/39019217/
- Florou P, Anagnostis P, Theocharis P, Chourdakis M, Goulis DG Does coenzyme Q(10) supplementation improve fertility outcomes in women undergoing assisted reproductive technology procedures? A systematic review and meta-analysis of randomized-controlled trials. Journal of assisted reproduction and genetics. 2020. https://pubmed.ncbi.nlm.nih.gov/32767206/
Authoritative references
How other clinical authorities define this term. RRM Academy curates these verbatim or under fair use so the medical consensus is visible alongside our RRM-contextualized definition above.
- MeSH D014451
A lipid-soluble benzoquinone which is involved in ELECTRON TRANSPORT in mitochondrial preparations. The compound occurs in the majority of aerobic organisms, from bacteria to higher plants and animals.
- NCI Thesaurus C916
A naturally occurring benzoquinone important in electron transport in mitochondrial membranes. Coenzyme Q10 functions as an endogenous antioxidant; deficiencies of this enzyme have been observed in patients with many different types of cancer and limited studies have suggested that coenzyme Q10 may induce tumor regression in patients with breast cancer. This agent may have immunostimulatory effects. (NCI04)
- Wikipedia Coenzyme_Q10
Coenzyme Q (CoQ), also known as ubiquinone, is a naturally occurring biochemical cofactor (coenzyme) and an antioxidant produced by the human body. The human body mainly produces the form known as coenzyme Q10 (CoQ10, ubidecarenone), but other forms exist. CoQ is used by and found in many organisms, including animals and bacteria. As a result, it can also be obtained from dietary sources, such as meat, fish, seed oils, vegetables, and dietary supplements.
This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.
