Can Herbal Tea Cause Miscarriage? | What Experts Recommend

Some herbal teas may raise the risk of miscarriage, particularly those containing herbs like pennyroyal or cohosh.

Herbal tea sounds like the safest drink you could reach for during pregnancy — a steaming mug of something natural and gentle. But natural doesn’t always mean risk-free, especially when it comes to pregnancy. The confusion around which herbs are safe and which ones raise concerns has led many expectant mothers to wonder if their daily tea habit could actually be harmful. The honest answer is a little more nuanced than a simple yes or no.

Yes, certain herbal teas have been linked to a higher risk of miscarriage, specifically those made from herbs known to stimulate uterine contractions or that lack solid safety data in pregnancy. However, widely available tea ingredients like ginger, peppermint, and rooibos are generally considered safe when consumed in typical food amounts. The real challenge is that herbs in the U.S. are not tightly regulated, so knowing exactly what is in your tea bag can be tricky.

What The Research Actually Says About Herbal Tea And Miscarriage

The science on herbal tea and miscarriage is far from settled. Large-scale clinical trials are rare, partly because studying potential risks to a developing fetus raises obvious ethical concerns. Most of what experts know comes from historical use, case reports, and laboratory analyses of specific herbs, rather than from large randomized human trials.

What researchers do agree on is that some herbs contain compounds that can act as abortifacients — substances that may cause the uterus to contract in the right quantity. A review hosted by the NIH notes that herbs like chamomile were associated with adverse perinatal outcomes, while another review found that evidence supporting the use of raspberry leaf to facilitate labor is actually quite weak.

Mayo Clinic sums it up plainly: do not drink herbal tea during pregnancy unless your healthcare professional gives the green light, because the effects of many herbs on a developing fetus are simply not well understood.

Why The “Natural” Label Feels Reassuring But Can Be Misleading

The word “natural” creates a powerful halo effect. If something comes from a plant, it feels inherently safer than a laboratory-made drug. But many potent medicines — from aspirin to digitalis — originate from plants too. The dose, the preparation method, and the specific herb all determine whether a cup of tea is soothing or potentially risky.

• Lack of regulation: The FDA does not test herbal teas for safety or purity before they hit store shelves. A blend labeled “calming” could contain ingredients not listed on the package, including herbs that experts advise avoiding during pregnancy.
• Dose matters: A sprinkle of parsley on your pasta is harmless for most people. A strong tea brewed from several parsley sprigs might be enough to trigger uterine contractions, particularly in large amounts. The dose separates a food from a medicinal — or risky — substance.
• Individual variability: Everyone metabolizes plant compounds differently. Two pregnant women drinking the same chamomile tea might have very different responses, which makes blanket safety claims hard to verify.
• Herb combinations: Some blends mix multiple botanicals. A tea that is safe on its own might interact with another herb in the blend, creating an unpredictable effect. This is why obstetricians generally recommend sticking to single-ingredient teas with a known safety profile.

Because of these variables, experts caution against assuming that any herbal product is automatically safe for pregnancy. The safest approach is to treat herbal teas like any other substance you put into your body during this time — with caution and a conversation with your provider.

Herbs Commonly Flagged By Maternal Health Experts

Certain herbs have a longer history of concern than others. Pennyroyal, black cohosh, blue cohosh, and dong quai are among the herbs most frequently flagged by maternal health sources. These herbs contain compounds that, even in moderate amounts, may stimulate uterine contractions or interfere with blood flow to the placenta. Sage and parsley tea, when consumed in large quantities, have also been linked to increased risk in some reports.

Chamomile is a trickier case. It is widely available and often considered gentle, but a 2020 review in PMC concluded that chamomile use during pregnancy may be unsafe, at least until more rigorous studies confirm its safety profile. Other sources place it in a mid-risk category, suggesting it is best limited or avoided during the first trimester when the fetus is most vulnerable. Because the evidence is not definitive, many clinicians err on the side of caution.

The pattern across these herbs is fairly consistent: the data is rarely strong enough to prove that a specific herb causes miscarriage, but the historical and pharmacological red flags are enough that most doctors recommend steering clear of them entirely during pregnancy.

This table reflects general expert consensus rather than strict clinical rules, and individual recommendations can vary based on your health history and the specific product you are considering.

How To Choose A Safer Herbal Tea

If you are craving a warm, caffeine-free drink, there are options generally considered fine during pregnancy. The key is to choose well-studied herbs in moderate amounts and to buy from reputable brands. Here is a practical step-by-step approach for making a more informed choice.

1. Stick to a short list of known safe herbs. Ginger, peppermint, rooibos, and lemon balm are generally well-tolerated in standard tea amounts. Ginger is even recommended by some healthcare providers to help with morning sickness.
2. Read the ingredient label closely. Avoid blends with long lists of botanicals you do not recognize. If a tea contains any of the herbs listed in the previous table, it is best left on the shelf.
3. Limit your intake to one or two cups per day. Even with generally safe herbs, excessive intake creates unnecessary uncertainty. Moderation is the most evidence-backed approach available.
4. Check with your OB or midwife. This is ultimately the most important step. Herbal teas are not one-size-fits-all, and your provider knows your specific health history and pregnancy risks.

This framework helps reduce the guesswork, but individual situations vary widely. A tea that is fine for one pregnant person might not be ideal for another who has a history of preterm labor or other complications.

Why A Quick Chat With Your Doctor Really Matters

The biggest challenge with herbal teas during pregnancy is the lack of reliable data. Because herbs are classified as dietary supplements rather than drugs, manufacturers are not required to prove their products are safe or effective before selling them. This means that a tea labeled “organic” or “all-natural” could contain herbs that interact with your prenatal vitamins or affect your pregnancy in ways that are not yet well documented.

This is where your healthcare provider becomes your most valuable resource. The regulatory gap means consumers cannot always trust that a blend contains only what is on the label, a point underscored by the FDA herbal tea warning. A quick conversation with your OB or midwife can clarify which teas are acceptable given your personal health picture. They can also help you distinguish between well-supported risks and scare tactics.

Some women hesitate to bring up herbal tea with their doctor, worrying it is too minor a question. But when a significant number of pregnant women turn to herbs for common complaints like nausea or anxiety, making sure your provider is aware of everything you are consuming — including tea — ensures you are making fully informed choices.

The Bottom Line

Herbal tea is not automatically risky, but it is not automatically safe either. The evidence is strongest against a few specific herbs — pennyroyal, cohosh, and dong quai — and weakest for common ingredients like ginger and peppermint, which most experts consider fine in normal amounts. The challenge is that the research on most herbs is simply too thin to offer blanket reassurance.

If you are pregnant and wondering whether a particular tea fits into your routine, your obstetrician or midwife is the best person to ask — they can weigh the specific herb against your trimester and medical history without guessing.