A mitochondrial antioxidant that shines for sperm quality — with a modest testosterone signal in infertile men, not healthy ones.
Coenzyme Q10 is a compound your body makes to power the mitochondria — the energy factories inside cells — and it doubles as an antioxidant. Levels fall with age. Sperm cells are especially energy-hungry and vulnerable to oxidative damage, which is where CoQ10's clearest benefit lies. It's also widely used to ease the muscle aches some people get from statin medication.
Mainly in men with fertility problems. Reviews of trials in infertile men show CoQ10 improves sperm count, motility and shape, and is associated with modestly higher testosterone and inhibin B. In healthy men with normal levels, that hormone effect hasn't been demonstrated — the benefit is tied to correcting oxidative stress in the reproductive system. So it's a strong choice for sperm health, a modest one for testosterone in a specific group, and unproven as a general booster.
Men working on fertility or sperm quality, older men wanting mitochondrial and antioxidant support, and those on statins troubled by muscle aches.
CoQ10 is found in small amounts across the diet, with the richest sources being organ meats (heart, liver and kidney are by far the highest), followed by fatty fish such as sardines, mackerel and herring, then beef, pork and chicken. Plant sources are more modest but include soybean and rapeseed oils, nuts (especially peanuts and pistachios), and some vegetables like spinach and broccoli. The catch is dose: even the richest foods provide only a few milligrams a day, far below the 100–300 mg used in studies — so food keeps your baseline topped up, but a supplement is needed for therapeutic amounts. Because your body's own production declines with age, older adults and those on statins (which lower CoQ10) are most likely to benefit from supplementing.
100–300 mg/day is the usual range (fertility studies often use 200 mg/day for 3–6 months). The reduced form, ubiquinol, absorbs better than plain ubiquinone. There's no formal upper limit; CoQ10 has an excellent safety record.
Take it with a meal containing fat, since it's fat-soluble and absorbs poorly otherwise. Benefits for sperm build over 3–6 months, so be patient.
CoQ10 is very well tolerated; high doses occasionally cause mild stomach upset or, rarely, trouble sleeping if taken late. No serious toxicity is established.
For fertility it pairs well with omega-3 and L-carnitine; otherwise it sits comfortably on the core foundation.
CoQ10 can reduce the blood-thinning effect of warfarin, so if you take it, keep intake consistent and tell your doctor. No other major interactions are established.
Anyone on warfarin (for the interaction above). Otherwise CoQ10 is suitable for almost everyone, including older men.
Prefer ubiquinol (the reduced, more absorbable form) in an oil-based softgel, with a clear dose, third-party tested. Avoid dry tablets, which absorb poorly.
CoQ10 is a low-risk mitochondrial antioxidant that genuinely helps sperm quality and gives a modest testosterone lift in infertile men — not a general booster. Use 100–300 mg/day of ubiquinol with a fatty meal, give fertility benefits 3–6 months, and mind the warfarin interaction.
Systematic review/meta-analysis of CoQ10 and semen parameters and testosterone, Frontiers in Pharmacology (2025); Antioxidants review of CoQ10 and male infertility (2021); Mayo Clinic.
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Based on guidance from the NHS, NICE, Cleveland Clinic and peer-reviewed research.
General information, not a substitute for personal medical advice — always consult your doctor or a qualified health professional before making health decisions. If you are pregnant, breastfeeding, trying to conceive, under 18, or taking medication, speak to your doctor before starting any supplement.