Fertility Supplements for Couples: A His and Hers Guide

Fertility supplements for couples are evidence-informed nutritional products designed to support the reproductive health of both partners during the preconception period — typically taken together for at least three months before trying to conceive. The rationale is biological: sperm production and egg development both depend on specific nutrients, and deficiencies in either partner can affect the chances of conception.

Trying to conceive can feel like a lot to carry, and it is natural to want to do everything you can to prepare. Thinking about supplementation as a shared project — something you and your partner approach together — reframes fertility as the biological duet it actually is.

Why Do Fertility Supplements Matter for Both Partners?

Fertility is a two-person biology. According to the UK's National Institute for Health and Care Excellence (NICE), male-factor issues account for roughly 30% of infertility cases, ovulatory disorders for another 25%, tubal factors for 20%, and unexplained causes for about 25% — and in a meaningful proportion of couples, contributing factors are present in both partners.¹

This is why a couples-focused approach to fertility supplements makes biological sense. A woman taking a high-quality prenatal supplement while her partner eats a nutrient-depleted diet may still face an uphill climb, because sperm quality influences fertilisation, implantation, and early embryo development. The reverse is equally true.

Treating fertility as a shared project also has an emotional benefit. Fertility struggles can quietly turn into blame — of oneself or a partner. When both partners commit to preconception preparation together, the narrative shifts from "one person's problem" to "something we are doing together."

What's the 90-Day Preconception Window, and Why Does It Matter?

The 90-day preconception window is the biological preparation period before conception during which both sperm and the final stage of egg maturation are developing. Sperm take roughly 74 days to form (Heller & Clermont 1964, revalidated with modern tracer methods by Misell 2006), and the last 85–90 days of follicular development are thought to be when egg quality is most influenced by environmental factors.^2,3

This is the window in which supplements, nutrition, and lifestyle have the clearest biological rationale. Nutrients consumed today are building the sperm and supporting the eggs that will be released roughly three months from now. For this reason, fertility specialists typically recommend that couples begin preconception preparation — including supplements — at least three months before actively trying to conceive.¹⁰

Research on fertility nutrition suggests that antioxidant status, folate availability, and micronutrient sufficiency during this window are associated with better sperm quality parameters and, in some studies, improved clinical pregnancy rates.^9,11 The evidence is stronger for addressing known deficiencies than for supplementing when intake is already adequate, which is why a good preconception plan starts with an honest look at diet, followed by targeted support.

Which Nutrients Support Her Fertility?

For women trying to conceive, the most evidence-backed nutrients are folic acid, vitamin D, iodine, CoQ10, and — for women with PCOS — myo-inositol. Folic acid is the only supplement the UK NHS specifically recommends during the preconception period: 400 micrograms daily from the point of trying to conceive until 12 weeks of pregnancy, to reduce the risk of neural tube defects such as spina bifida.⁴

Vitamin D plays a supporting role. A meta-analysis of 11 cohort studies including 2,700 women undergoing assisted reproductive treatment found that women replete in vitamin D had higher live birth rates than those who were deficient or insufficient (odds ratio 1.33).⁵ NHS guidance recommends that all adults in the UK consider a 10 µg vitamin D supplement, particularly from October to March.

CoQ10 has been studied for its role in oocyte mitochondrial function. A 2015 study in Aging Cell by Ben-Meir and colleagues showed that age-related decline in egg quality in mice could be partly reversed by CoQ10 administration, with the authors proposing that impaired mitochondrial performance from suboptimal CoQ10 availability contributes to age-associated oocyte deficits.⁶ Human data is more limited but is supportive, especially in women over 35 trying to improve egg quality naturally.

For women with polycystic ovary syndrome, myo-inositol has among the strongest evidence of any single fertility supplement. A 2023 systematic review and meta-analysis in Reproductive Biology and Endocrinology concluded that inositol is an effective and safe treatment in PCOS, with non-inferiority to metformin on most outcomes including cycle normalisation.⁷ Women with suspected PCOS should read more on myo-inositol for fertility and PCOS before deciding whether to include it.

Which Nutrients Support His Fertility?

For men trying to conceive, the nutrients with the strongest evidence are zinc, selenium, L-carnitine, CoQ10, omega-3 fatty acids, and vitamin E. A 2018 systematic review and meta-analysis by Salas-Huetos and colleagues in Advances in Nutrition pooled 28 studies and found that supplementation with selenium, zinc, omega-3 fatty acids, CoQ10, and carnitines produced measurable improvements in sperm concentration, motility, and morphology.⁹

Zinc plays a particularly central role. A 2018 review by Fallah and colleagues in the Journal of Reproduction & Infertility described zinc as "essential for male fertility," noting that zinc deficiency impedes spermatogenesis, contributes to sperm abnormalities, and reduces serum testosterone concentration.⁸ Zinc is found in oysters, beef, pumpkin seeds, and lentils, but supplementation (typically 10–15 mg daily as part of a fertility formula) is common when dietary intake is limited.

L-carnitine is the standout antioxidant for sperm motility. In the Salas-Huetos meta-analysis, carnitine supplementation produced the largest single improvement in sperm total motility (+7.84%) and progressive motility (+7.45%).⁹ The biological rationale is that carnitine concentrations in the epididymis are among the highest in the body, reflecting its role in sperm maturation. Men with diagnosed sperm DNA fragmentation or asthenozoospermia are most likely to benefit.

The broader picture comes from the 2022 Cochrane review by de Ligny and colleagues, which pooled 90 studies and 10,303 subfertile men.¹¹ The review reported a statistically significant benefit for antioxidant supplementation on live birth and clinical pregnancy — with the caveat that methodological quality across trials was variable and the authors concluded the overall evidence remains "low to very low certainty." In practice, this means antioxidant supplementation is a reasonable part of a preconception plan for men, but is not a stand-alone fix for significant male-factor infertility.

How Do His and Hers Fertility Needs Compare?

The table below summarises which nutrients support each partner, typical dose ranges, and the primary outcome each is associated with. It is designed as a scannable comparison — a starting point for planning, not a prescription.

Nutrient	Who it supports	Typical daily dose	Primary outcome	Evidence quality
Folic acid (folate)	Her (NHS recommendation)	400 µg	Neural tube defect prevention; ovulatory support	Tier 1 — NHS/WHO
Vitamin D	Both	10 µg (400 IU)	Live birth rate in ART; sperm quality	Tier 1 — meta-analysis
CoQ10 (ubiquinol/ubiquinone)	Both	100–300 mg	Oocyte mitochondrial function; sperm concentration/motility	Tier 1 — animal + human trial data
Myo-inositol	Her (PCOS context)	2 g twice daily	Cycle normalisation; ovulation in PCOS	Tier 1 — meta-analysis
Zinc	Him (primary); Her (supporting)	10–15 mg	Sperm concentration/motility; testosterone	Tier 1 — meta-analysis
Selenium	Him	55–100 µg	Sperm concentration, motility, morphology	Tier 1 — meta-analysis
L-carnitine	Him	1–2 g	Sperm motility (largest single effect)	Tier 1 — meta-analysis
Omega-3 (EPA/DHA)	Both	500–1,000 mg combined	Sperm count/morphology; inflammation	Tier 1 — meta-analysis
Vitamin E	Him (primary)	10–15 mg	Antioxidant; sperm DNA integrity	Tier 2 — supportive trials

This table is a starting point for conversation, not a prescription. Individual needs depend on diet, health conditions, medications, and blood test results — which is why NHS, NICE, and every reputable fertility clinician recommend that supplementation plans be personalised rather than generic.

How Should Couples Start Supplementing Together?

The simplest approach is to begin roughly three months before you plan to start trying, with a shared baseline of folic acid (her), vitamin D (both), and a couples-focused supplement that covers the main fertility nutrients for each partner. Consider a blood test for vitamin D, iron, and thyroid function before starting, especially if either partner has a chronic health condition.

Practical principles for a shared preconception plan:

• Start together, at the same time. Committing on the same date makes supplementation feel like teamwork, not a checklist one partner runs alone.
• Choose products with transparent dosing. A good fertility supplement lists every ingredient and its dose. Proprietary blends that hide quantities should be a red flag.
• Check for third-party testing. Products tested by independent labs offer more assurance of ingredient accuracy.
• Pair supplementation with a preconception-friendly diet. A fertility diet rich in whole foods, antioxidants, and healthy fats covers much of what supplements aim to provide.
• Review any existing medications. Certain supplements (such as high-dose vitamin E) can interact with medications. A pharmacist or GP can check compatibility.
• Don't stop early. Most evidence on fertility supplements assumes consistent use for 90 days or longer. Stopping at week 4 rarely produces the outcomes the research describes.

A sustained shared preconception plan gives both partners a sense of agency during what is often a stressful time. The goal is not to "optimise" fertility into a guarantee — no supplement can do that — but to make sure nutritional status is working in favour of conception rather than against it.

Supporting Your Fertility with FertilitySmart

Preconception nutrition is most effective when it reflects both partners' different biological needs. A couples-focused approach provides the foundation nutrients for egg quality and ovulation alongside the antioxidants and trace minerals that support sperm development.

At FertilitySmart, we offer both fertility supplements for women and fertility supplements for men that contain key nutrients such as folate, CoQ10, vitamin D, zinc, selenium, and L-carnitine. Explore our range of evidence-based fertility supplements formulated with the nutrients discussed in this guide.

References

1. National Institute for Health and Care Excellence. Fertility problems: assessment and treatment. NICE Clinical Guideline CG156. Published February 2013; updated September 2017. Available at: https://www.nice.org.uk/guidance/cg156
2. Heller CG, Clermont Y. Kinetics of the germinal epithelium in man. Recent Prog Horm Res. 1964;20:545–575. Revalidated by Misell LM et al. A stable isotope-mass spectrometric method for measuring human spermatogenesis kinetics in vivo. J Urol. 2006;175(1):242–246. doi:10.1016/S0022-5347(05)00053-4
3. Gougeon A. Regulation of ovarian follicular development in primates: facts and hypotheses. Endocr Rev. 1996;17(2):121–155. doi:10.1210/edrv-17-2-121
4. National Health Service (UK). How and when to take folic acid. NHS Medicines Guide. Updated 2025. Available at: https://www.nhs.uk/medicines/folic-acid/how-and-when-to-take-folic-acid/
5. Chu J, Gallos I, Tobias A, Tan B, Eapen A, Coomarasamy A. Vitamin D and assisted reproductive treatment outcome: a systematic review and meta-analysis. Hum Reprod. 2018;33(1):65–80. doi:10.1093/humrep/dex326
6. Ben-Meir A, Burstein E, Borrego-Alvarez A, et al. Coenzyme Q10 restores oocyte mitochondrial function and fertility during reproductive aging. Aging Cell. 2015;14(5):887–895. doi:10.1111/acel.12368
7. Greff D, Juhász AE, Váncsa S, et al. Inositol is an effective and safe treatment in polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled trials. Reprod Biol Endocrinol. 2023;21(1):10. doi:10.1186/s12958-023-01055-z
8. Fallah A, Mohammad-Hasani A, Colagar AH. Zinc is an essential element for male fertility: a review of Zn roles in men's health, germination, sperm quality, and fertilization. J Reprod Infertil. 2018;19(2):69–81. Available at: https://pubmed.ncbi.nlm.nih.gov/30009140/
9. Salas-Huetos A, Rosique-Esteban N, Becerra-Tomás N, Vizmanos B, Bulló M, Salas-Salvadó J. The effect of nutrients and dietary supplements on sperm quality parameters: a systematic review and meta-analysis of randomized clinical trials. Adv Nutr. 2018;9(6):833–848. doi:10.1093/advances/nmy057
10. Stephenson J, Heslehurst N, Hall J, et al. Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health. Lancet. 2018;391(10132):1830–1841. doi:10.1016/S0140-6736(18)30311-8
11. de Ligny W, Smits RM, Mackenzie-Proctor R, et al. Antioxidants for male subfertility. Cochrane Database Syst Rev. 2022;5(5):CD007411. doi:10.1002/14651858.CD007411.pub5