No single study has established a proven “best time of day” to drink beetroot juice for fertility, but the available evidence points toward daily consumption starting well before conception attempts, timed so that each glass is finished roughly two to three hours before you want its blood-flow effects to peak. The logic is rooted in how beetroot’s key active compound, dietary nitrate, is converted into nitric oxide in your body, and in the one human fertility trial that showed improved outcomes when participants drank a beetroot-based juice daily during a specific window of their IVF cycle. The picture is more nuanced than social-media advice tends to suggest, though, and the evidence base is thinner than you might expect.
Why Beetroot Juice Comes Up in Fertility Conversations
Beetroot is one of the richest dietary sources of inorganic nitrate. When you eat or drink it, bacteria living on the back of your tongue convert that nitrate into nitrite, which then gets further converted into nitric oxide (NO) in your blood and tissues. Nitric oxide is a powerful vasodilator, meaning it relaxes and widens blood vessels, increasing blood flow. Research has confirmed that dietary nitrate from beetroot and leafy greens can boost NO activity and improve cardiovascular function and blood flow broadly.1PubMed Central. Dietary interventions for fetal growth restriction – therapeutic potential of dietary nitrate supplementation in pregnancy
For fertility, the connection is straightforward: the uterine lining needs robust blood flow to support embryo implantation, and the ovaries need good blood supply for follicle development. On the male side, sperm production depends on adequate blood flow to the testes, and erection quality is directly tied to NO-mediated vasodilation. Beetroot juice has been shown specifically to aid in the conversion of nitrite to nitric oxide, improving blood flow including to the uterus.2PubMed Central. Effect of Beta vulgaris extracts on dysmenorrhea among adolescent girls That is the theoretical basis. The question is how strong the actual fertility evidence is.
The One Human Fertility Trial
As of now, the most direct evidence linking beetroot juice to fertility outcomes in humans comes from a single study involving women undergoing IVF with a procedure called intracytoplasmic sperm injection (ICSI). Women in the supplementation group drank a daily homemade juice made from fresh beetroot, watermelon, and ginger, starting from the day of embryo transfer and continuing until the day of their pregnancy test. Women in the control group did not follow the juice protocol.3PubMed Central. Beetroot, watermelon and ginger juice supplementation may increase the clinical outcomes of Intracytoplasmic Sperm Injection cycles
The results were striking: the implantation rate was about 25% in the juice group compared to roughly 21% in controls, and the clinical pregnancy rate nearly doubled, reaching 41% versus 22%.3PubMed Central. Beetroot, watermelon and ginger juice supplementation may increase the clinical outcomes of Intracytoplasmic Sperm Injection cycles Those numbers are eye-catching, but a few things are worth keeping in mind before reorganizing your fertility plan around them.
First, the juice was not beetroot alone. It combined beetroot with watermelon (which is rich in the amino acid citrulline, another NO precursor) and ginger (which has anti-inflammatory properties). Isolating how much of the benefit came from the beetroot itself is impossible from this study design. Second, this was a single, non-blinded study in an IVF population, so the women knew whether they were drinking the juice or not, which introduces potential placebo and behavior-change effects. The researchers themselves framed the finding cautiously. Still, the direction of the results is consistent with what you would expect if increased NO availability around the time of implantation genuinely improves uterine blood flow.
What the Timing in That Study Tells You
The juice protocol in the ICSI trial started on the day of embryo transfer, not weeks before. That suggests the researchers were targeting the implantation window specifically, the roughly five-to-ten-day stretch when an embryo needs to attach to the uterine lining and establish a blood supply. If you are trying to conceive naturally rather than through IVF, the equivalent window would be the days following ovulation, roughly the second half of your cycle.
That said, there is a reasonable argument for starting earlier. Blood flow to the uterus matters not only during implantation but also during follicle growth in the first half of the cycle, when a good blood supply to the ovaries supports egg development. Many fertility nutritionists suggest drinking beetroot juice throughout the cycle rather than only in the luteal phase, though this recommendation is based on physiological reasoning rather than a clinical trial showing additional benefit.
As for the time of day, research on beetroot juice’s pharmacodynamics offers a clear answer: plasma nitrite levels peak roughly two to three hours after you drink it.4PubMed. Beetroot juice and exercise: pharmacodynamic and dose-response relationships Studies in older adults confirm this same two-to-three-hour window for peak blood levels.5PubMed Central. One Week of Daily Dosing with Beetroot Juice Improves Submaximal Endurance and Blood Pressure in Older Patients with Heart Failure and Preserved Ejection Fraction If the goal is maximal nitric oxide availability during a specific activity window, like timed intercourse, drinking your juice about two hours beforehand makes sense from a pharmacokinetic standpoint. For general daily supplementation aimed at all-day blood flow, morning consumption is a reasonable default since it aligns with the body’s natural activity patterns, though the specific hour matters less when the aim is cumulative, daily exposure.
Evidence on the Male Side
Most of the male fertility evidence comes from animal studies, which means the findings are suggestive but not proven in humans. In one experiment, betanin, the red pigment compound in beetroot, was given to rats that had experienced testicular damage from heat stress and loud noise. The betanin treatment significantly improved both sperm motility and sperm concentration, restoring them closer to normal levels.6Heliyon. Betanin administration ameliorates noise and scrotal hyperthermia-induced testicular toxicity through inhibiting oxidative stress, apoptosis and inflammation
A separate study looked at sodium nitrate (the same inorganic nitrate form found in beetroot) given to diabetic rats over two months. The treatment improved sperm parameters, testicular tissue health, spermatogenesis, and serum testosterone levels compared to untreated diabetic rats.7PubMed Central. Two months sodium nitrate supplementation alleviates testicular injury in streptozotocin-induced diabetic male rats The mechanism in both studies appears to be a combination of improved blood flow through the NO pathway and a reduction in oxidative stress, which is one of the major causes of sperm damage.
For men, then, the timing question is different. Sperm take roughly 74 days to develop from start to finish, so if you are trying to improve sperm quality, you would want to be drinking beetroot juice consistently for at least two to three months before conception attempts, not just in the week before. A one-off glass is unlikely to change sperm parameters. The animal data used supplementation periods of weeks to months, reinforcing this longer-term approach.
Choosing a Product That Actually Delivers
One of the most overlooked problems with beetroot juice for any health goal is that products on the shelf vary wildly in their actual nitrate content. A study testing beetroot products marketed to athletes found an almost 50-fold range in nitrate content across different products, and even samples of the same product varied by an average of 30%.8International Journal of Sport Nutrition and Exercise Metabolism. What Is in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes A separate analysis of commercial beetroot juices and powders found nitrate levels ranging from 0.01 to 2.4 grams per liter, meaning some products contained almost no meaningful nitrate at all.9Journal of Food Composition and Analysis. Compositional characteristics of commercial beetroot products and beetroot juice prepared from seven beetroot varieties grown in Upper Austria
If you are buying beetroot juice for its nitric oxide benefits, this matters a great deal. Not all beetroot products are equivalent. In general, concentrated “shots” tend to contain more nitrate per serving than diluted bulk juices, and powders can be even more concentrated, though consistency remains an issue across all formats.10PubMed Central. Comparison of total antioxidant potential, and total phenolic, nitrate, sugar, and organic acid contents in beetroot juice, chips, powder, and cooked beetroot Brands that list their nitrate content on the label (often in milligrams or millimoles) give you the most control over dosing. Products that simply say “beetroot juice” without specifying nitrate levels are a guessing game.
The ICSI study used homemade juice from fresh beetroots, which sidesteps the commercial product variability issue but introduces its own inconsistency, since nitrate levels differ between beetroot varieties and growing conditions. If you are juicing at home, using raw, deep-red beetroots (the color intensity loosely correlates with betanin content, though not perfectly with nitrate) and drinking the juice fresh gives you the best shot at a meaningful dose. Cooking reduces nitrate content, so raw is preferable for this purpose.
The Mouthwash Problem
Here is something that almost never comes up in fertility advice but can completely undermine the effects of beetroot juice: antibacterial mouthwash. The conversion of dietary nitrate into nitrite, the critical first step in producing nitric oxide, depends entirely on bacteria living in your mouth. Those bacteria are what convert the nitrate you swallow into the nitrite that eventually becomes NO. If you use an antiseptic mouthwash that kills those bacteria, you effectively shut down the entire pathway.
Research shows that chlorhexidine-based mouthwash almost completely eliminates the nitrate-to-nitrite conversion and abolishes the blood-pressure-lowering effects of dietary nitrate.11Nitric Oxide. A stepwise reduction in plasma and salivary nitrite with increasing strengths of mouthwash following a dietary nitrate load When antibacterial mouthwash is used, nitrite formation in saliva is abolished and the normal rise in plasma nitrite after eating nitrate-rich foods is markedly reduced.12Nitric Oxide. The increase in plasma nitrite after a dietary nitrate load is markedly attenuated by an antibacterial mouthwash A broader review has noted that because oral bacteria are essential for this pathway, eradicating them with antiseptic mouthwashes may lead to nitric oxide deficiency.13PubMed Central. Antiseptic mouthwash, the nitrate-nitrite-nitric oxide pathway, and hospital mortality: a hypothesis generating review
In practical terms: if you are drinking beetroot juice for fertility benefits but also rinsing with Listerine or a chlorhexidine rinse every morning, you could be neutralizing much of the benefit. Brushing and flossing your teeth is fine, as these do not wipe out oral bacteria the way antiseptic rinses do. But if you are serious about getting the NO boost from beetroot, skip the antibacterial mouthwash, at least on the days you are supplementing.
Oxalate Content and Kidney Considerations
Beetroot juice is not a concern-free supplement at high doses. One issue that gets little attention is its oxalate content. Beetroot juices contain between 60 and 70 milligrams of oxalate per 100 milliliters, making them among the highest-oxalate beverages tested.14Journal of Food Composition and Analysis. The oxalate content of fruit and vegetable juices, nectars and drinks If you are drinking large servings daily, the oxalate load adds up fast. For most people with healthy kidneys, this is not a problem. But if you have a history of calcium oxalate kidney stones, or if you have any degree of chronic kidney disease, heavy consumption of oxalate-rich juices is a real concern. Case reports have documented acute kidney failure from high-oxalate juice consumption in people with underlying kidney issues.15The American Journal of Medicine. Oxalate Nephropathy Due to ‘Juicing’: Case Report and Review
The standard concentrated beetroot shot (roughly 70 ml) contains much less oxalate than drinking 500 ml of bulk juice, so format matters. If you are concerned, using a concentrated shot rather than large glasses of juice reduces your oxalate exposure while still delivering a meaningful nitrate dose.
Safety During Pregnancy and the Preconception Window
A question that naturally follows from fertility use is whether beetroot juice is safe once you actually become pregnant. The evidence here is reassuring, though limited. A randomized, double-blind, placebo-controlled feasibility trial gave beetroot juice to pregnant women with high blood pressure. After both short-term (3 hours) and longer-term (8 days) supplementation, no safety concerns were raised, and there was a strong correlation between increases in plasma nitrite and reductions in diastolic blood pressure in the treatment group.16Nitric Oxide. Effects of dietary nitrate supplementation, from beetroot juice, on blood pressure in hypertensive pregnant women: A randomised, double-blind, placebo-controlled feasibility trial
Researchers have also noted that dietary nitrate-rich supplements are considered a more appealing option than pharmaceutical approaches for pregnant women who may be deficient in nitric oxide, with the potential to reduce hypertension and preeclampsia risk and improve placental blood flow.17Pregnancy Hypertension. Nitrate-rich dietary supplementation during pregnancy: The pros and cons The key word is “suggested,” not “proven.” Large-scale safety trials in pregnant populations have not been completed, so the current evidence is promising but preliminary. For the preconception window, there are essentially no known safety concerns for healthy adults at the doses typically consumed.
Putting a Realistic Protocol Together
Given the limited but consistent evidence, a practical approach for someone interested in trying beetroot juice for fertility would look something like this:
- Start early: If you are trying to improve overall reproductive blood flow and, for men, sperm quality, begin daily supplementation at least two to three months before actively trying to conceive. Sperm development takes time, and the NO-mediated blood flow benefits appear to be cumulative with daily use rather than immediate from a single dose.
- Daily consistency matters more than exact timing: A daily glass or concentrated shot is the pattern used in the available studies. The ICSI trial used daily juice throughout the implantation window. The animal studies used continuous supplementation over weeks to months.
- Two to three hours before you want peak effect: If you are timing intercourse around ovulation and want to maximize blood flow at a specific time, finish your juice roughly two to three hours before. For general daily use, morning is the simplest default.
- Check what you are buying: Choose a product with a stated nitrate content, or juice raw beetroots at home. Avoid assuming that all beetroot products are equivalent.
- Ditch the antibacterial mouthwash: This is arguably the easiest and most overlooked way to ensure you actually absorb the nitrate you are consuming.
- Watch your kidneys: If you have any history of kidney stones or kidney disease, talk to your doctor before adding daily beetroot juice. Concentrated shots deliver less oxalate than large volumes of bulk juice.
What the Evidence Does Not Yet Show
It would be misleading to leave the impression that beetroot juice is a proven fertility treatment. The human evidence consists of one non-blinded IVF study using a multi-ingredient juice, and the male fertility data comes entirely from animal models. No randomized controlled trial has tested beetroot juice alone in couples trying to conceive naturally and measured time-to-pregnancy or live birth rates. The physiological reasoning is sound: nitric oxide improves blood flow, and blood flow to reproductive organs matters for both egg and sperm development and for implantation. But “physiologically plausible” and “clinically proven” are not the same thing.
The existing research also cannot tell you whether beetroot juice adds anything beyond what you would get from simply eating a diet rich in nitrate-containing vegetables, like spinach, arugula, and celery. These foods deliver the same dietary nitrate through the same oral-bacteria-dependent pathway. Beetroot juice is convenient because it concentrates the nitrate into a small volume, but there is no reason to believe it is uniquely effective compared to other high-nitrate foods consumed in equivalent amounts.
For couples already doing everything else right, beetroot juice is a low-risk addition with at least a plausible mechanism and one encouraging (if imperfect) human study behind it. For anyone expecting it to overcome a diagnosed fertility issue on its own, the evidence simply is not there yet. It belongs in the “probably does not hurt, might help a bit” category, which, in the world of fertility supplements, is honestly better-supported than most of what you will find on the shelf.