12 Best Vitamins and Supplements for Male Fertility in 2026

Discussing male fertility used to be taboo. These days it’s more of a shared conversation. Nearly 50% of fertility problems are due to a male factor, and our understanding of how sperm health affects fertility has evolved significantly. One key topic of interest is what nutritional supplementation can do for sperm count, motility and morphology. There’s a lot of research being done on this topic.

Here’s our breakdown of the top 12 vitamins and supplements for male fertility backed by clinical research. Whether you’re planning a family or just looking for reliable information, this guide will arm you with everything you need to know about fertility vitamins for men.

If you’re looking for a personalised private gynaecologist in London alongside this information, the team at myGynaePlus offers dedicated fertility support as part of its women’s health and wellness services.

Why Do Vitamins and Supplements Matter for Sperm Health?

The male sperm cell is exceptionally susceptible to oxidative stress. Oxidative stress occurs when your body has too many reactive oxygen species (“bad guys”) and not enough healthy antioxidants to combat them. Frontiers in Endocrinology estimates that “30-80% of infertile men have increased ROS levels in their semen” (2025). ROS stands for reactive oxygen species and high levels within semen have recently been termed male oxidative stress infertility or MOSI.

Antioxidants and micronutrients help by protecting sperm during their approximately 74-90 day maturation process. Damage that occurs during this time period can impact sperm count, motility, morphology, and DNA structure. If you take supplements during this key time window you can reduce the amount of damage to sperm. Remember, it takes about three months for each sperm cell to fully mature, so men should begin taking these supplements at least three months before trying to conceive.

Now, let’s break down which supplements work best sperm cell by sperm cell.

12 Vitamins and Supplements for Male Fertility, Ranked by Evidence

1. Coenzyme Q10 (CoQ10)

CoQ10 sits at the top of most evidence-based lists for good reason. It powers the mitochondria in sperm tails, which are responsible for swimming, and acts as a potent antioxidant. A 2024 systematic review and meta-analysis (PROSPERO: CRD42024513515) covering 781 participants found that CoQ10 supplementation significantly improved sperm concentration, semen volume, and total motility. It also increased clinical pregnancy odds with an odds ratio of 6.02 a meaningful finding.

A separate network meta-analysis ranked CoQ10 as the most effective single antioxidant for improving sperm concentration (SUCRA: 80.4%). Most trials use doses between 200 and 400 mg per day for a minimum of three months.

2. L-Carnitine

L-carnitine is an amino acid derivative that transports fatty acids into the mitochondria of sperm cells, directly fuelling their movement. It consistently tops rankings for improving sperm motility in research comparisons. A network meta-analysis published in Frontiers in Endocrinology found that L-carnitine (and its combination with L-acetyl-carnitine) showed statistically significant benefit for motility compared to placebo.

In a network meta-analysis of randomised controlled trials, carnitine had the highest SUCRA ranking (86.2%) for sperm motility among all antioxidants studied. Typical doses in studies range from 500 mg to 2,000 mg daily.

3. Zinc

Zinc is the second most abundant mineral in the human body. Its role in testicular development and sperm maturation is clear. Seminal zinc levels are lower in men with reduced sperm fertilisation capacity. Zinc supplementation improves total sperm motility and sperm concentration based on randomized controlled trials. Zinc deficiency is positively associated with male hypogonadism. Typical doses range from 66 mg to 220 mg per day.

4. Selenium

Selenium is necessary for sperm production (spermatogenesis) in mammals. Selenium is a component of glutathione peroxidase, an important antioxidant enzyme which occurs in spermatozoa. Administering selenium supplements in the range 100–300 µg/day for 3–11 months increases sperm motility, total sperm count, and improves sperm morphology. 

Selenium is usually administered in clinical trials with vitamin E, and combined supplementation is usually superior to supplementation with either nutrient alone. The typical UK adult consumes around 55 µg of selenium per day from food.

5. Omega-3 Fatty Acids

Omega-3 fatty acids (particularly DHA) are incorporated into sperm cell membranes and affect their fluidity and function. Omega-3 fatty acids showed the most substantial effect on sperm count in meta-analysis data, with an increase in total sperm concentrations of approximately 10.98 × 10⁶ sperm/mL and improvements in both motility and morphology.

Omega-3 fatty acids showed the most positive effect on sperm concentration when compared with other antioxidant supplements in a network meta-analysis of randomised controlled trials. A typical dose is 1,000–2,000 mg of combined EPA and DHA daily.

6. Vitamin C

Vitamin C is one of the most studied antioxidants in reproductive medicine. It protects sperm DNA from oxidative damage and supports healthy sperm morphology. Vitamin C had the highest SUCRA ranking (89.3%) for sperm morphology among all antioxidants assessed in a network meta-analysis.

Vitamins C and E are frequently paired because vitamin C can help regenerate vitamin E, extending its antioxidant action. Studies commonly use doses of 500 mg to 1,000 mg per day.

7. Vitamin E

Vitamin E (alpha-tocopherol) protects sperm cell lipid membranes from peroxidation (a form of oxidative damage which decreases sperm vitality). Supplementation with 15 mg daily has been shown to result in significant improvement of sperm motility in some studies. Combined selenium and vitamin E therapy has produced significant improvements in sperm motility and morphology in various studies. Most trials use daily doses ranging from 200 mg to 400 mg.

8. Folic Acid (Vitamin B9)

Folic acid contributes to DNA synthesis and repair, making it relevant to sperm DNA integrity. Zinc and folic acid combined improved sperm concentration in randomised controlled trials with treatment durations of at least 12 weeks. Supplementing with 400 mcg per day of folic acid has also been associated with a reduction in genetic abnormalities in sperm DNA in some studies.

It is worth noting that the evidence on folic acid alone, without zinc, is more mixed. It tends to work better as part of a combination approach.

9. Vitamin D

Sperm cells carry vitamin D receptors, and low vitamin D levels are frequently observed in men with poor semen parameters. A 2023 meta-analysis covering five trials found approximately a 5% improvement in total motility and modest morphology gains with around 4,000 IU per day of vitamin D₃.

Given that vitamin D deficiency is widespread in the UK particularly from October to March this is one supplement that many men may genuinely need. A blood test is the most reliable way to check your levels before supplementing.

10. N-Acetyl Cysteine (NAC)

NAC is a precursor to glutathione, the body's most abundant internal antioxidant. It supports the sperm's own defences against oxidative damage. N-acetyl cysteine was identified as one of the beneficial antioxidants in a systematic review of 29 studies that found positive effects on semen parameters, assisted reproductive outcomes, and live-birth rates.

NAC is commonly dosed at 600 mg per day in fertility studies and is often included in multi-antioxidant formulas.

11. Lycopene

Lycopene is a carotenoid found in tomatoes and other red fruits. It accumulates in testicular tissue and has been studied specifically for its role in reducing sperm DNA fragmentation. Lycopene was identified alongside carnitines, vitamins E and C, NAC, CoQ10, selenium, zinc, and folic acid as having beneficial effects across studies evaluating antioxidant supplementation on semen parameters and assisted reproductive outcomes.

Typical doses in studies range from 6 to 8 mg per day.

12. Ashwagandha (KSM-66)

Ashwagandha has shown some promise for male fertility. In men with oligozoospermia, a 2024 double-blind randomised controlled trial showed that taking 300 mg of KSM-66 ashwagandha twice daily significantly increased sperm count by 167%, semen volume by 26%, and normal morphology by 20% compared to placebo at eight weeks.

Furthermore, ashwagandha appears to support testosterone and decrease cortisol, a stress hormone known to suppress reproductive function. Therefore, ashwagandha may be especially beneficial in males suffering from chronic stress.

Which Combination of Supplements Works Best?

Here is a quick reference list of the supplements with the strongest evidence for each key parameter:

• Sperm count/concentration: CoQ10, omega-3 fatty acids, selenium

• Sperm motility: L-carnitine, omega-3, zinc, CoQ10

• Sperm morphology: Vitamin C, L-carnitine, selenium, CoQ10

• Sperm DNA integrity: Folic acid, NAC, lycopene, vitamin C

• Overall sperm quality (multi-supplement): CoQ10 + L-carnitine combination

A placebo-controlled double-blind randomised clinical trial found that a combination of L-carnitine and CoQ10 produced superior improvements in semen parameters compared to either supplement taken alone, including increases in semen volume, sperm concentration, progressive motility, and a reduction in abnormal sperm forms.

A reasonable starting point for most men is a trio of CoQ10, L-carnitine, and zinc with vitamin D added if a blood test reveals deficiency.

An Honest Word on the Evidence

Okay, so the science is positive but not quite there yet. There was a systematic review published in Nutrients in 2025 (Michaelsen et al.) which reviewed 50 randomised controlled trials. The review found that whilst certain supplements helped improve individual sperm parameters there was no clear evidence that supplementation alone led to improved rates of live birth. Certainty of evidence was low to very low across most trials.

That doesn’t mean you shouldn’t take supplements. It just means they aren’t a magic pill. They work best in combination with eating a healthy diet, getting regular exercise, not smoking, limiting alcohol intake and keeping a healthy weight. There are many factors at play. 

If you are facing unexplained infertility or have concerns about your sperm health, getting specialist advice is a logical next step. The team of fertility specialists at myGynaePlus Gynaecologists work with couples every day who have questions about their reproductive health. They can help you decipher which investigations or interventions may be right for you.

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FAQs

Q1: How long does it take for male fertility supplements to work? 

Sperm take approximately 74 to 90 days to develop fully, so most clinical trials run for at least three months. Men should begin taking supplements at least 90 days before trying to conceive to allow enough time for any improvements to show in sperm quality.

Q2: Can I take all these supplements at the same time? 

Many of them are safe to combine, and some work better together for example, CoQ10 and L-carnitine, or vitamins C and E. That said, you should not take high doses of multiple supplements without guidance. Some minerals, like zinc and selenium, can be harmful in excess. A healthcare provider can help you choose what is appropriate for your situation.

Q3: Does diet alone provide enough of these nutrients for male fertility? 

A diet rich in oily fish, nuts, seeds, whole grains, and colourful vegetables provides many of these nutrients. However, men who eat a typical Western diet, smoke, drink regularly, or have confirmed deficiencies may not get adequate amounts from food alone. In those cases, targeted supplementation can help fill gaps.

Q4: Is there a specific supplement recommended for improving sperm DNA fragmentation? 

High sperm DNA fragmentation is increasingly recognised as a cause of unexplained infertility and recurrent miscarriage. Antioxidants including NAC, folic acid, lycopene, and vitamin C have been studied for reducing DNA damage. A semen DNA fragmentation test which some fertility clinics offer can help determine whether this is a concern for you.

Q5: Are male fertility supplements safe if we are also undergoing IVF or ICSI? 

Some antioxidant supplements may complement assisted reproductive treatment, but you should always disclose any supplements to your fertility specialist before starting treatment. Certain substances can interact with medications or affect the interpretation of test results. The specialist team at myGynaePlus can advise on what is appropriate alongside any fertility treatment plan.