Can Coffee Cause Infertility? | What The Research Says

Moderate coffee intake (under 200 mg daily) is not linked to infertility, though high intake may slightly affect conception timing for some people.

You probably know someone who swears their morning coffee helped them conceive, just as you’ve heard the warning that caffeine could be the reason it hasn’t happened yet. The fertility rumor mill spins hard around coffee, leaving plenty of people wondering if they need to quit their daily cup entirely when trying to get pregnant.

The honest answer is more nuanced than a simple yes or no. Current evidence suggests moderate coffee consumption — under 200 mg per day — doesn’t cause infertility, but the research is mixed enough that high intake deserves a closer look. Here’s what the studies actually show about caffeine and your chances of conceiving.

What The Research Says About Caffeine And Fertility

A 2020 systematic review published by the NIH dug through the available evidence on caffeine and infertility risk. The researchers found low-quality evidence across the board — meaning most of the studies weren’t strong enough to draw firm conclusions. Their bottom line: low, medium, and high doses of caffeine intake do not appear to increase the risk of infertility.

That doesn’t mean the story ends there. A 2024 review noted that some studies showed a negative effect of coffee, tea, or overall caffeine consumption on female fertility, while others found no effect at all. The mixed results make it hard to give a one-size-fits-all answer.

For women who weren’t having trouble getting pregnant in the first place, a 2018 study found no association between coffee, tea, and caffeine consumption and primary infertility. That’s reassuring if you’re starting out with a clean fertility slate.

Why The “Coffee Causes Infertility” Warning Sticks

The concern about caffeine and fertility didn’t come from nowhere. It’s rooted in biology: caffeine is an adenosine receptor antagonist, which means it blocks certain chemical signals in the body. Some researchers have suggested this could influence fertility by affecting ovulation, menstrual cycle characteristics, or sperm quality.

Here’s where the evidence gets specific about what might happen with higher intakes:

• Miscarriage risk: A 2017 study found an increased risk of spontaneous abortion with higher consumption of coffee or caffeine during early pregnancy. This doesn’t mean caffeine causes infertility, but it does raise questions about intake once you’re pregnant.
• Male reproductive function: A 2017 systematic review suggested caffeine intake, possibly through sperm DNA damage, may negatively affect male reproductive function. A 2022 review echoed this but noted no definitive link between caffeine and male infertility has been found.
• Time to pregnancy: Some fertility organizations suggest there may be a dose-response effect where higher caffeine intake modestly prolongs the time it takes to get pregnant, though the evidence here is less consistent.
• No effect in some studies: A 2017 review reported that male caffeine consumption had no effect on fertilization, pregnancy, or live birth delivery rates in several studies. The picture remains split.
• Pregnancy complications: Tommy’s, a UK pregnancy charity, notes there is more evidence on caffeine’s effects during pregnancy — including increased risk of low birth weight and miscarriage — than on its effects before conception. That’s an important distinction.

The common thread through all of this is dose. The moderate intake threshold — under 200 mg daily — keeps showing up as the point where risks don’t seem to rise. Cross that line regularly, and the picture gets fuzzier.

What 200 Mg Of Caffeine Looks Like In Practice

A 12-ounce cup of brewed coffee contains approximately 200 mg of caffeine, which lines up with the recommended daily limit. Mayo Clinic specifically advises limiting caffeine to less than 200 mg per day — about one to two 6-ounce cups of coffee — when trying to conceive, as this amount does not appear to affect the ability to get pregnant. Per the pregnancy caffeine limit from Mayo Clinic, that same cap carries through pregnancy for many experts.

Notice that a single large mug of brewed coffee can already hit your daily cap. If you also have tea, soda, chocolate, or an energy drink later in the day, you can easily exceed 200 mg without realizing it. Keeping a rough mental tally helps.

How Caffeine Affects Male Fertility Differently

Most conversations about fertility and coffee center on women, but male fertility matters here too. The research on sperm quality and caffeine is as mixed as the female data, but there’s enough concern that some clinical trials have included coffee avoidance as a lifestyle change.

A clinical trial for severe male factor infertility requested participants to stop smoking and avoid coffee as part of the lifestyle modifications. That doesn’t prove coffee causes male infertility — it means researchers considered it worth controlling for when studying other factors. A 2022 review concluded coffee consumption may affect male reproductive function but found no definitive link to infertility.

The possible mechanism involves sperm DNA damage. Caffeine may increase oxidative stress or directly interfere with DNA integrity in sperm cells. But again, the studies that found no effect on fertilization or pregnancy rates are just as common as those that found a negative effect. The balance of evidence leans toward moderation rather than elimination.

1. Stick to the 200 mg limit: One 12-ounce coffee or two smaller cups is the general guideline. Count all sources of caffeine, not just coffee.
2. Consider timing: Spacing caffeine throughout the day rather than consuming it all at once may help your body process it more steadily. Some experts suggest avoiding caffeine after 2 PM to protect sleep quality, which indirectly supports fertility.
3. Be consistent: Erratic high-intake days followed by zero-caffeine days don’t help. A steady moderate pattern is easier to maintain and track.
4. Watch hidden sources: Soda, chocolate, certain teas, and some over-the-counter medications contain caffeine. Reading labels prevents accidental over-consumption.
5. Talk to your doctor: If you have existing fertility concerns or a diagnosed condition, your specific situation may call for different limits. Individual guidance always beats general advice.

What About Decaf, Tea, And Energy Drinks?

Decaf coffee contains only trace amounts of caffeine — roughly 2 to 5 mg per cup — and is generally considered a safe choice when trying to conceive. It won’t push you anywhere near the 200 mg limit, so it’s a reasonable swap if you miss the ritual of coffee drinking.

Tea is more variable. Black tea has about 47 mg per cup, green tea about 28 mg. You’d need quite a few cups to exceed 200 mg from tea alone, but heavy tea drinkers should still track their intake. Herbal teas (peppermint, ginger, rooibos) are naturally caffeine-free and don’t count.

Energy drinks are a different story. They often contain 80 mg per 8-ounce serving, and many people drink larger cans. The combination of caffeine with other stimulants and sugar hasn’t been specifically studied for fertility, but most experts recommend avoiding them while trying to conceive simply because the caffeine adds up fast. One clinical trial looking at male infertility explicitly asked participants to avoid coffee — the male infertility coffee avoidance trial on ClinicalTrials.gov shows that researchers considered caffeine relevant enough to control for when studying other interventions.

The Bottom Line

The evidence on caffeine and infertility is genuinely mixed, but the clearest takeaway is that staying under 200 mg per day doesn’t appear to raise your risk of infertility or delay conception for most people. High and very high intakes may affect ovulation, sperm quality, or time-to-pregnancy for some individuals, though the research isn’t strong enough to say this applies to everyone. If you’re trying to conceive, moderate intake is safe — just keep a rough tally of your daily caffeine sources.

If you have a diagnosed fertility condition or a history of miscarriage, your reproductive endocrinologist or OB can help you set a personalized caffeine target that fits your full medical picture rather than relying on general guidelines alone.