Vitamins for men when planning a pregnancy: what is important

Up to half of fertility problems are related to male factors, and sperm quality depends not only on genetics and age, but also on diet, body weight, smoking, alcohol, sleep, overheating, and certain medications. Therefore, "fertility vitamins" for men should not be viewed as a magic pill, but as part of an overall preparation program, where lifestyle and treatment of identified causes are priorities, and supplements are used selectively as needed. [1]

The complete cycle of spermatogenesis in humans takes approximately 74 days, plus the time it takes for sperm to travel through the epididymis. Therefore, any lifestyle and dietary changes should be evaluated no earlier than after 3 months. This also determines the typical duration of trial courses of supplements, if there is a reason to prescribe them. [2]

Current clinical guidelines emphasize the following: modifiable risk factors should be addressed first, varicoceles should be treated as indicated, and endocrine disorders and infections should be corrected. Empirical antioxidants and multivitamins have not been shown to have a convincing effect on pregnancy and live birth. The decision to use them is made on an individual basis after a baseline assessment. [3]

A quick summary of supplements: what science says today

Systematic reviews and large randomized trials show that most vitamin and mineral supplements for "male fertility" do not improve the likelihood of pregnancy or live birth. Individual nutrients may slightly improve certain sperm parameters with low-quality evidence, but they generally do not demonstrate a clinical effect on couples' outcomes. [4]

A landmark JAMA study of 5 mg folic acid and 30 mg zinc in men failed to improve sperm parameters or live birth rates, while also causing gastrointestinal side effects. Similar neutral results were obtained in the MOXI study of an antioxidant mixture. [5]

Reviews from 2024–2025 clarify: coenzyme Q10 and carnitines sometimes improve motility, selenium is associated with a small increase in morphology in some studies, and omega-3, vitamin D, and vitamin E generally do not demonstrate a reproducible effect on key indicators or outcomes. The level of evidence is generally low, and heterogeneity is high. [6]

The antioxidant craze has also given rise to a converse problem: "reduction stress," where an excess of antioxidants disrupts the physiological processes of sperm maturation. Therefore, exceeding physiological doses without objective evidence is not recommended. [7]

What to check and adjust before talking about supplements

A basic examination by a urologist or andrologist, a semen analysis according to World Health Organization guidelines, a weight and blood pressure check, and an assessment of medications and habits are a minimum start. Initiating high-dose regimens without such an assessment is inadvisable. [8]

Lifestyle interventions provide the greatest benefits: quitting smoking, limiting alcohol consumption, losing weight to a body mass index (BMI) of less than 30, engaging in regular aerobic and strength-training activity for 150-300 minutes per week, sleeping 7-8 hours, avoiding scrotal overheating, and reducing exposure to solvents and pesticides. These measures are associated with improved sperm counts and are often recommended as a first line. [9]

Androgen anabolic steroids and testosterone replacement therapy are contraindicated when planning a family: exogenous testosterone suppresses spermatogenesis and can lead to severe oligospermia and azoospermia. For hypogonadism with plans to conceive, gonadotropin-based regimens are used rather than testosterone. [10]

Laboratory tests, if indicated, include vitamin D for those at high risk of deficiency, B12 for vegans, ferritin for suspected iron deficiency, and glycemia and lipid profile for those overweight. Decisions about supplementation should be based on results rather than a blind guess. [11]

Key Nutrients: What is Known for Each?

Folic acid and zinc. A large randomized trial in JAMA found no benefit from the combination of 5 mg folic acid and 30 mg zinc on sperm parameters and live births, and adverse events were noted. These supplements are not routinely recommended for fertility in men, except in the presence of laboratory-confirmed zinc deficiency or rare genetic variants of folate metabolism. [12]

Antioxidants as a class. A Cochrane review and randomized trials have not confirmed an improvement in pregnancy or live birth rates, and the effect on sperm parameters is inconsistent. Some new studies show a reduction in the DNA fragmentation index in subgroups, but the clinical significance remains questionable. [13]

Coenzyme Q10 and carnitines. Meta-analyses have documented a slight improvement in motility and some laboratory parameters after 3-6 months with good tolerability; however, there is no evidence for the outcome of the pair. It may be used as an individual trial course after ruling out other treatable causes. [14]

Selenium and vitamin E. Data are mixed. Combinations sometimes improved individual parameters, but neutral or negative effects were also observed. Vitamin E in high doses increases the risk of bleeding, and selenium carries a risk of selenosis when exceeding the upper tolerable level. The approach should be limited to safe doses and as indicated. [15]

Vitamin D. Randomized trials yield mixed results: most men without severe deficiency do not show significant improvement in sperm parameters or live births. It makes sense to correct obvious deficiency to target values while maintaining safe doses. [16]

Omega-3 polyunsaturated fatty acids. Research is conflicting, with some studies finding no benefit. Given their safety and cardiovascular benefits, dietary intake is recommended, rather than high-dose supplements. [17]

Risks of Excess: Higher Levels of Consumption and Interaction

High doses of vitamin E are associated with an increased risk of hemorrhagic stroke and bleeding, which is especially important when taking anticoagulants and antiplatelet agents. For adults, the tolerable upper intake level is 1,000 mg of alpha-tocopherol per day. [18]

Chronic selenium intake exceeding 400 mcg per day can cause brittle hair and nails, a metallic taste, rashes, and stomach upset. For adults, the upper tolerable intake level is 400 mcg per day from all sources. [19]

Zinc in doses above 40 mg per day reduces copper absorption and can lead to copper deficiency with hematological and neurological consequences. European standards allow an even lower upper limit. [20]

Vitamin D is safe in doses up to 4,000 IU per day in adults without hypercalcemia, but long-term intake above this level increases the risk of hypercalcemia and stone formation. Dose monitoring is especially important when taking calcium concomitantly. [21]

When supplements are appropriate

Supplements are justified in cases of confirmed deficiency of a specific nutrient or as a short, individualized trial course in men with idiopathic sperm abnormalities after eliminating modifiable factors. The typical duration is 3 months, followed by reassessment. Only safe doses should be used, not exceeding the upper intake levels, and polypharmacy should be avoided. [22]

In cases of severe sperm DNA fragmentation and signs of oxidative stress, some clinicians prescribe antioxidants for 3-6 months, but guidelines emphasize the lack of high-quality evidence for "hard" outcomes. The decision is made after discussing the potential benefits and risks of excessive antioxidant use. [23]

If pathologies affecting fertility are identified, etiologic interventions are the primary focus: varicocele treatment, hormonal normalization, infection therapy, and correction of hypogonadism without testosterone. Supplements play only a supporting role here. [24]

Practical steps for 3 months of preparation

1. Create a Mediterranean-style diet: vegetables, fruits, whole grains, nuts, legumes, fish 2-3 times a week, olive oil, and a minimum of ultra-processed foods. This diet covers most needs without the risk of overdosing. [25]
2. Establish a routine: normalize body weight, add regular exercise, stop smoking, limit alcohol, minimize overheating of the scrotum and contact with toxic substances at work. [26]
3. Based on indications and test results, add targeted nutritional correction in safe doses for 12 weeks with a reassessment plan. Do not initiate testosterone or anabolic steroids if planning a pregnancy. [27]

Table 1. Recommended and upper intake levels of key nutrients for men aged 19–50 years

Nutrient	Recommended level	Upper permissible level	Security Comments
Vitamin D	600-800 IU per day	4,000 IU per day	Calcium control during long-term use
Vitamin E	15 mg per day	1,000 mg per day	Risk of bleeding at high doses
Zinc	11 mg per day	40 mg per day	Risk of copper deficiency with excess
Selenium	55 mcg per day	400 mcg per day	Risk of selenosis when exceeding
Folates	400 mcg per day	1,000 mcg folic acid	May mask B12 deficiency

Based on materials from the National Institutes of Health. [28]

Table 2. What qualitative reviews and randomized trials show

Additive	Sperm parameters	Pregnancy and live birth	Summary of the evidence
Folic acid + zinc	No clinically significant improvement	No improvement, there are adverse effects	Not recommended routinely
Antioxidant mixtures	The results are contradictory	There is no compelling benefit	Individually, taking into account the risks of excess
Coenzyme Q10	A slight increase in motility is possible	There is no data on benefits.	Consider this as a trial course
Carnitines	Sometimes improves motility and concentration	There is no data on benefits.	Consider individually
Omega-3	The data is heterogeneous, often neutral	There is no data on benefits.	Prioritize food
Vitamin D	Mostly neutral without deficit	There is no data on benefits.	Deficit correction is justified

Summary of 2024–2025 reviews and key RCTs. [29]

Table 3. Rich food sources of nutrients

Nutrient	Products	Approximate serving	Notes
Omega-3	Salmon, sardine, mackerel, herring	100-150 g of fish	2-3 servings per week are enough
Vitamin E	Almonds, hazelnuts, seeds, avocado	30 g of nuts	Food is preferable to capsules
Zinc	Oysters, beef, beans, pumpkin seeds	85-100 g	Plant foods have lower absorption
Selenium	Brazil nuts	1-2 nuts	High concentration, do not exceed
Vitamin D	Fatty fish, fortified foods	100-150 g	Sun and fortified foods are important

Prioritize a whole foods diet. [30]

Table 4. When to consider a point correction

Situation	What to do	Example of a safe dose for 12 weeks
Confirmed vitamin D deficiency	Correction under the supervision of a physician	Up to 2,000-4,000 IU per day with monitoring
Low zinc in the blood and diet	Food sources plus supplement	Up to 15-25 mg per day, with copper for long-term use
Low selenium in a poor diet	Food Plus Short Course	Up to 100 mcg per day, no more than 200 mcg without indications
Idiopathic asthenozoospermia after lifestyle modification	Individual trial course	Coenzyme Q10 100-200 mg per day or L-carnitine 1-2 g per day

Doses do not exceed the upper levels and are selected individually. [31]

Table 5. What to avoid when planning parenthood

Factor	Why is it harmful?	What to do
Testosterone and anabolic steroids	Suppress spermatogenesis, risk of azoospermia	Do not use; consider gonadotropins for hypogonadism.
Smoking and vaping	Oxidative stress, sperm DNA deterioration	Complete refusal
Frequent saunas and overheating	Decreased concentration and motility	Limit overheating
High-dose antioxidants without indications	Risk of reduction stress and side effects	Stick to physiological doses

Key links to recommendations and reviews. [32]

Frequently Asked Questions

Should all men take multivitamins before conception?
No. With a normal diet and no confirmed deficiencies, multivitamins do not increase the chances of pregnancy. Lifestyle adjustments and treatment of underlying causes should be considered first, then targeted supplementation should be considered. [33]

If you want to "play it safe," what should you choose for 3 months?
The diet as in the practical steps section, plus, based on test results, the minimum doses of the specific deficient nutrient. If there are no deficiencies, an individual trial course of coenzyme Q10 or carnitine in safe doses is acceptable, but expectations should be moderate. [34]

Is there any point in taking vitamin D if it's "slightly below the norm"?
It makes sense to increase your levels to target levels, but don't expect vitamin D alone to improve fertility. Choose a dose that doesn't exceed the safe upper limit, and monitor calcium levels during long-term use. [35]

Is an excess of antioxidants dangerous?
Yes, excessive doses can shift the balance toward reduction stress and impair sperm function. Therefore, high doses and multi-component "supercomplexes" are avoided unless clearly indicated. [36]

Result

For men planning fatherhood, lifestyle, correcting deficiencies based on test results, and treating identified causes are the primary contributors to fertility. There is no universal "vitamin pill for conception." Supplements are appropriate as targeted and safe support as part of a 3-month program, but they should be chosen specifically and in physiological doses to avoid crossing the line from benefit to harm. [37]