Fertility Supplements For Women: What The Evidence Actually Says
Many fertility supplements marketed to women don't have the scientific proof they claim. A review from 2023 looked at 39 brands and found that none could show solid evidence that their products really help with getting pregnant. This doesn’t mean that supplements are useless, though. What’s really important is understanding which nutrients your body needs for conception, at what amounts, and for how long, along with other factors affecting fertility.
We'll help you identify the nutrients supported by real research, point out the gaps, and explain why a one-size-fits-all approach doesn’t work for everyone. If you prefer a tailored plan that considers your personal health history, you can book an initial consultation with Floralia.
Do fertility supplements for women actually work?
Some do, for some women, in some circumstances. That is the honest answer, and it is the one the supplement industry is least likely to give you.
There is very strong evidence on how certain nutrients help resolve certain problems. Inositol is associated with improved ovulation and conception in PCOS patients. The presence of sufficient amounts of vitamin D is correlated with an increased likelihood of giving birth from IVF treatments. As far as nutrients that improve egg quality, CoQ10 is one of the best-documented supplements that help women over 35 years old and those who suffer from ovarian insufficiency conceive.
What the evidence does not support is the idea that any woman trying to conceive will benefit from any fertility supplement on the shelf. An advantage may be gained if there is an exact correlation between the vitamin deficiencies and a woman’s specific condition. For example, if a woman is in perfect health regarding her vitamin D levels, her menstrual cycle is regular, and she has no problems with conception, then the use of a fertility product will not increase her chances of conceiving any sooner.
The other noteworthy aspect: supplements are most effective if used as part of an overall preconception strategy. Sleep, stress management, blood glucose control, body fat levels, exposure to toxins, and nutritional intake all affect fertility, and no pill can overcome an inadequate foundation.
Why one supplement stack does not suit every woman
Most articles on consumer fertility all view supplementation in the same way: do this, do this, and then do this and increase your chances. When you apply that kind of thinking in practice, it doesn’t take long before it doesn’t work any more. Two patients of the same age who want to conceive but find themselves with fertility issues may well have different reasons for those problems.
Personalisation is the distinction between being strategic when supplementing and hoping for the best when supplementing. This involves knowing what is really going on in your body by looking into pathology, history, cycle rhythm, blood work, and analysing the variables often overlooked in generic information.
Age, ovarian reserve, and egg quality
A woman in her late 20s with regular cycles and a normal ovarian reserve presents a scenario where she requires a different supplement profile compared to the woman aged 38 who wishes to become pregnant within a year, despite having failed to do so previously. There is deterioration in egg quality as someone grows older. There is also reduced efficacy of the antioxidants that guard the developing eggs against oxidative stress. That is where Coenzyme Q10, Omega-3 fatty acids and vitamin E, among others, come into play.
A 32-year-old woman with AMH within the normal range, regular periods, no other problems, and a healthy BMI can gain significantly more by addressing any issues related to low levels of vitamin D and optimising her iron intake than by consuming excess amounts of CoQ10.
PCOS, insulin resistance, and irregular cycles
PCOS is one of the most studied subjects when it comes to fertility support, and there are some truly astounding results about inositol. Research has shown that 88% of women who have taken inositol experienced spontaneous menstrual cycles, with improved ovulation and conception rates.
However, inositol is just part of the story. Another underlying factor behind many cases of PCOS is insulin resistance, which can be impacted through changes to diet, magnesium, chromium, and sleep quality, even occasionally using berberine. The problem is that a woman with PCOS focusing solely on the inositol aspect alone is ignoring the root cause of the issue. This is how sub-fertility due to PCOS is approached through naturopathy.
Recurrent pregnancy loss and underlying deficiencies
Miscarriages are among the most difficult aspects of infertility to handle, and supplements play a definite part in this area, although rarely a cure-all approach. Deficiencies and medical contributors that should be considered include vitamin D deficiency, folate (especially if a woman has the MTHFR polymorphism), anti-thyroid antibodies, blood sugar imbalances, and clotting problems.
This is definitely an area that requires input from both your fertility doctor and your naturopath. The first step would be investigation, followed by supplementing according to what is discovered. Preconception vitamins won't help much when there are pregnancy losses related to autoimmune thyroid disease or high homocysteine levels. For women navigating repeated loss, dedicated recurrent miscarriage support can bring together the investigative work and the integrative treatment in a way that generic supplement protocols cannot.
Thyroid, autoimmunity, and other drivers most articles miss
Insufficient thyroid functioning and the role played by autoimmune conditions in subfertility should be considered, and have been repeatedly ignored in standard fertility supplement articles. Elevated TSH levels within the normal laboratory reference range but over 2.5 mIU/L can interfere with ovulation and the retention of early pregnancy. Anti-thyroid antibodies, especially anti-TPO, are linked to increased miscarriages despite thyroid hormones being within normal ranges.
Selenium is important for thyroid gland functions and has been found to reduce the level of thyroid antibodies in women suffering from autoimmune thyroid disorder. Iodine is another important factor, but its dosage must be carefully determined since excess iodine intake in the case of autoimmune thyroiditis is harmful. Zinc and iron are also necessary for thyroid functioning.
The issue is not whether all women require a thyroid evaluation prior to conception attempts. Rather, if you've been trying for over a year, have experienced miscarriages, have symptoms of thyroid dysfunction (hypersensitivity to cold, dry skin, alterations in hair quality, chronic fatigue, menstrual irregularities), or have a familial history of thyroid disorders, then thyroid testing as part of a comprehensive evaluation must be discussed prior to starting any fertility supplements. Not doing so is a leading cause of poor outcomes with supplementation.
The core nutrients with the strongest fertility evidence
These are the nutrients for which there is the strongest evidence. The fact that a nutrient appears on this list doesn’t imply that all women require it. It indicates that if it is necessary, it should be taken seriously.
Folate (and why it is not the same as folic acid)
Folate is considered one of the most crucial elements for any preconception care program, but also one of the most misinterpreted. The most common misconception about folate concerns folic acid, which is the synthesised version of the vitamin and is found mostly in supplements and fortified products. What is essential to understand is that folic acid should be converted into its active form of 5-MTHF (methylfolate) before being used effectively.
Women with variants in their MTHFR gene have been found to be able to maintain suboptimal levels of folate even while taking what seems to be an adequate level of supplementation with folic acid alone. Some patients will end up accumulating unprocessed folic acid in their blood due to their condition. This is where the role of using methylfolate (or folate forms in general) comes into play in natural medicine, so that it is available irrespective of MTHFR status. If you suspect methylation issues may be shaping your response to folate, genetic methylation testing can clarify what your body actually needs.
The general recommended dose in preparation for conception is 400 to 800 micrograms per day, which should be taken at least three months prior to conception and until the end of the first trimester. Higher doses may be required for women who have MTHFR gene variants, neural tube defects, a history of miscarriages, and high homocysteine levels.
Vitamin D
Vitamin D is not technically a vitamin, but works similarly to a hormone and has receptors all throughout the reproductive tract. Several studies have indicated that women who possess adequate amounts of vitamin D have better chances of conceiving and giving birth compared to those with a vitamin deficiency.
Despite the abundance of sunny days in Perth, many people are deficient in vitamin D, especially females working indoors, protecting themselves from the sun, with dark skin or spending long hours travelling during daytime. It is necessary to undertake tests because the dosage must be prescribed according to individual test results. The standard maintenance dosage is 1000 to 2000 IU per day, yet females suffering from severe deficiency require larger doses in order to increase levels of vitamin D to an ideal state of 100 to 150 nmol/L.
Coenzyme Q10 (CoQ10)
CoQ10 is a potent antioxidant that protects the egg from damage by free radicals during its development process. It also ensures the proper functioning of mitochondria, which gives energy to support the maturation of eggs. The use of this drug is most effective in women over 35 years of age or with a decreased ovarian reserve.
Recommended dosages vary from 100 to 600 mg per day, with the latter dosage more commonly used for women undergoing in vitro fertilisation or those with serious issues regarding their ovaries. The active form of CoQ10 (known as ubiquinol) tends to be better absorbed compared to ubiquinone, especially for women aged 40 and older.
Inositol
Inositol (especially the combination of myo-inositol and D-chiro-inositol in a ratio of 40:1) is supported by strong clinical studies in PCOS-associated subfertility. Inositol is beneficial for insulin sensitivity and promotes ovulation; it can enhance pregnancy rate in women with PCOS when supplemented regularly.
The usual dose is 4 g of myo-inositol along with 100 mg of D-chiro-inositol per day, at least for three months prior to noticing any improvement. Inositol is safe at normal doses and has minimal adverse effects.
Omega-3 fatty acids (DHA and EPA)
Omega-3 fatty acids contribute towards healthy eggs and reduce inflammation, and they also assist with the early development of the fetus's brain. The research on Omega-3 fatty acids in improving fertility is especially relevant for older women and those suffering from inflammation-induced subfertility.
The intake of approximately 1000-2000mg of EPA/DHA per day from a high-quality fish oil would be an excellent start. This is an area where quality really matters, as it is far better to avoid taking any oxidised fish oil. Third-party-tested supplements with lower oxidation rates should be sought out.
Iron
Iron deficiency is one of the most common but under-diagnosed causes of ovulatory infertility. In the case where a person’s haemoglobin levels are within the normal range, their ferritin levels might still be below optimal due to reduced ovulation or lack of energy.
For treating low iron, 25 to 30 mg per day of elemental iron would suffice, and the iron should be taken together with vitamin C for increased absorption, but separate from caffeine, calcium, dairy, and tea. It is crucial to test before starting iron supplements, since excess iron is detrimental, and its effects may be mistaken for iron deficiency.
Zinc and selenium
Zinc assists in the proper development and maturation of eggs, and it is essential for conception as well. Deficiency of zinc can result in delays in conception. Selenium helps maintain thyroid activity and also acts as an antioxidant, which helps in improving fertility. The average daily requirement of zinc can be in the range of 15 to 30 milligrams per day, while that of selenium is between 100 to 200 micrograms daily. Both minerals are also required for the fertility of males, which is why both partners benefit from having them addressed.
DHEA for women with low ovarian reserve
DHEA is a hormone that serves as the building block for other hormones such as testosterone and oestrogen. Women with decreased ovarian reserve have benefited from supplementation of DHEA in numerous research studies where there was improvement in the ovarian reaction, egg quality, pregnancy success rate, and overall results of the IVF cycle.
However, DHEA is not suitable for all women. DHEA may make conditions like PCOS worse in some women and also in women with normal ovarian reserve. Furthermore, you need to have your DHEA-S tested first before using this hormone and discuss your case with a practitioner. DHEA is usually taken in doses ranging between 25-75mg per day and lasts for eight to twelve weeks prior to your IVF cycle.
L-arginine, vitamin C, and other antioxidants
The amino acid L-arginine helps with the circulation of blood to the reproductive organs and is effective in cases where there are issues with insufficient blood supply to the uterus. Antioxidants, such as vitamins C and E, help protect the egg and sperm cells from being oxidised, along with other antioxidants like glutathione.
Antioxidants may seem like something that you should take in excess amounts, but too much of them could affect the oxidation signal that triggers ovulation. They should be taken in reasonable amounts based on the clinical situation.
Fertility supplements vs prenatal vitamins: what is the difference?
Fertility supplements and prenatal vitamins have different uses, and the confusion between them often results in losses of both time and money.
Prenatal vitamins are formulated for pregnancy. These supplements have increased amounts of folic acid and other vitamins and minerals (such as iron and iodine) for the development of the foetus and needs of the mother. However, they are not made for improving fertility, since they do not have ingredients for increasing conception chances.
Fertility supplements are designed to support conception. They may be made specifically for producing healthier eggs, supporting regular ovulation and hormone regulation, or dealing with other factors that may inhibit reproduction. The contents vary widely by brand and indication.
When women are planning to conceive, a carefully chosen preconception multivitamin often proves beneficial. This supplement, tailored to bridge the gap between general health and fertility needs, can be enhanced with specific nutrients based on personal health profiles. Once pregnancy is confirmed, the focus shifts to a prenatal vitamin that includes the right amounts of folate and iron. At this stage, some fertility supplements may be paused, while others might still be essential. This transition is crucial, and a naturopath can guide you through the preconception phase to ensure everything is aligned for a healthy pregnancy.
When to start taking fertility supplements before trying to conceive
Typically, the recommendation is to begin supplementing three months prior to conception. This recommendation is well-founded since the development of an egg is completed within 90 days, and during this time period, nutrition plays an important role in determining its quality.
Three months is the minimum for most women. A healthy woman with no problems should spend between eight and twelve weeks preparing. However, a woman above 35 years old with polycystic ovaries, previous miscarriages, or some deficiencies that need fixing, should spend at least six months preparing. If you have a vitamin D deficiency, you may need up to six months to get it right.
Being ahead also gives you enough time to consider the importance of dietary building blocks, adequate sleep, stress management, and other factors that supplements cannot fix. Those women who benefit most from preconception care are always those who see it as a months-long project.
What about male fertility? Why both partners should be supplementing
The quality of sperm accounts for around half of subfertility problems, but preconception nutrition is commonly viewed as the woman’s problem. It requires nearly 74 days for the production of sperm. Therefore, the nutritional and lifestyle environment surrounding conception plays an important role in creating quality sperm during conception.
Nutrients that have been shown to be most effective for improving male fertility are zinc, selenium, CoQ10, omega-3 fatty acids, vitamin D, vitamin C, vitamin E, and folic acid. In general, antioxidants play an essential role in the production of sperm due to its vulnerability to oxidative stress. Additionally, lifestyle plays a significant role in determining sperm quality, as heat exposure, alcohol intake, smoking, drug abuse, lack of sleep, and obesity negatively affect sperm quality.
A semen analysis serves as the first step for the man. In the case of suboptimal parameter results, targeted nutritional supplementation combined with lifestyle modifications will make a difference very quickly in just one cycle of sperm generation. Otherwise, it is sufficient to take a preconception supplement designed specifically for men.
Why the supplement aisle is failing women trying to conceive
There have been rapid advancements in fertility supplements, but the regulatory policies haven’t managed to keep pace. The consequence is an entire shelf filled with supplements making bold promises but very little obligation to back them up.
Most brands cannot substantiate their claims
According to the 39-brand review that was previously mentioned, there isn’t one brand out of all those reviewed that can scientifically justify that their supplement can help women conceive. Some supplements have ingredients that have been scientifically proven effective. Others have unique blends, new ingredients that have never been used for fertility purposes before, known fertility ingredients at too small amounts to make a difference, or simply inactive ingredients labelled as active.
The information provided on the label does not say much. There may be plenty of vitamins, such as vitamin D, CoQ10, folate, or even inositol, that appear in high concentrations, but their use will bring no tangible benefits simply due to their poor composition.
The problem with generic "fertility blend" formulas
Multivitamin combinations for increasing fertility can look promising in a way that you think you’re hitting everything with one tablet. However, that’s not the case. Fertility combination products are likely to have inadequate amounts of necessary nutrients for your body, and most of the time, you don’t need those ingredients at all.
A woman with PCOS needs a higher dose of inositol, which is not available in any of the blends. A woman who has a vitamin D deficiency needs the right dose to be administered based on her specific deficiency. And a woman with the MTHFR mutation needs methyl folate rather than folic acid.
Why more is not better, and the risk of too much of a good thing
There is an underlying belief that when something is good, more would be even better. In fertility supplements, the belief results in serious issues. Excess vitamin A intake in the first trimester leads to congenital anomalies. Large doses of iron can become toxic and cause liver damage. Excess vitamin D intake affects the body’s ability to absorb calcium. Antioxidants, when consumed in large quantities, disrupt the oxidative processes needed for ovulation.
This is one of the best reasons to test before supplementation. When you know where you begin, then you dose based on where you need to be, and you can also stop or decrease the supplement when you are already there.
How a naturopath builds a personalised preconception plan
Your personalised plan will begin with an in-depth understanding of who you are, rather than a regimen of supplements. The order of operations matters because supplementation only works as well as the foundation it sits on.
Pathology testing that shapes supplementation
A typical preconception pathology panel usually consists of complete iron status, vitamin D, B12, and folate, complete blood count, thyroid profile, along with antibodies, fasting glucose and insulin (or hemoglobin A1C), and, if necessary, depending on the medical history, hormone testing throughout the cycle, MTHFR gene testing, homocysteine, and clotting factor screening.
Testing justifies itself through its ability to do multiple things at once. First, it helps to identify the deficits that require correction; second, it provides the starting point for measuring the success of the supplement based on its ability to deliver; and third, it eliminates the variables that cannot be corrected through supplementation. The latter aspect is significant in that it allows immediate referral to a specialist when necessary.
Dietary foundations before and alongside supplements
Nutritional supplements are highly concentrated sources of that specific nutrient. However, they cannot provide the full spectrum of nutritional benefits that food does, and they cannot reverse a nutrition plan that is inhibiting fertility. Balancing blood sugar, having enough protein, consuming healthy amounts of fats, eating lots of vegetables, and avoiding highly processed foods should be priorities.
Every woman has unique dietary needs, especially when managing specific health conditions. For instance, women with PCOS often benefit from a diet centred around low glycemic index foods and regular meal schedules. Those with low iron levels should incorporate iron-rich foods into their meals while being mindful of factors that can hinder absorption, such as calcium and caffeine. When it comes to improving sleep, examining evening food and drink choices can make a significant difference. Rather than making drastic changes, these dietary adjustments are typically subtle yet consistent, accumulating their effects over the preconception period.
Reviewing and adjusting over the preconception window
A preconception plan is not a one-size-fits-all plan that gets provided during your first visit. This process changes with the retesting, the symptoms and cycles change, and so will the treatment plan change. For example, a woman might begin her treatment with inositol and methyl folate, add CoQ10 when eggs become more important, up vitamin D if test results reveal that she is not responsive to the maintenance level, and lower iron intake when ferritin levels become optimised.
This is what sets the process apart from simply taking a fertility supplement available at any store. This regimen adapts to your body and changes according to how you are progressing towards a state wherein conception will be easy for you, not by having to take pills all your life, but through a simpler method.
Work with a Perth naturopath on your fertility journey
If you have been taking fertility supplements but are unsure about their efficacy, or you have just embarked on your preconception cycle and need to get it right, there is no substitute for an individualised approach offered by consulting a naturopath.
Floralia offers services to all women at each step of their fertility journey, whether it be during conception preparation, dealing with repeat miscarriages, preparation for IVF treatment, or post-loss support for pregnancy. The sessions take place at a leisurely pace, the advice is personalised according to your pathological history, and the process takes place concurrently with your GP, fertility doctor, obstetrician, or IVF clinic. You can learn more about our approach on our fertility naturopath page. Book an initial consultation to start building a plan that actually fits you.
