Herbal teas sound harmless, and some have been said help relieve common pregnancy symptoms. But others can be dangerous to consume during pregnancy.

There isn’t a lot of research on the potential effects of herbal tea use during pregnancy, so it’s a good idea to consult with your doctor before trying them.

Let’s take a look at some of the teas that are thought to be safe to drink when you’re pregnant and some that could be harmful.

Herbal teas are made by infusing plant materials into hot water. These types of teas can be made from:

  • bark
  • flowers
  • roots
  • berries
  • seeds
  • leaves

Herbal teas typically don’t contain caffeine. They may be used to tame upset tummies, soothe frayed nerves, or induce sleep.

Commercial brands of herbal tea are often safe to drink in moderation.

But it’s important to know that herbs and herbal tea blends aren’t regulated by the Food and Drug Administration. This means they don’t undergo the same level of review as over-the-counter and prescription drugs.

Herbal preparations may include contaminants like heavy metals. The quality and potency of herbal teas may vary considerably between products.

When looking for teas, try to purchase them from manufacturers you trust.

The following teas are generally considered safe to drink during pregnancy. Still, it’s a good idea to consult with your doctor before drinking them.

Red raspberry leaf tea

While its safety remains controversial during the first trimester, this tea is popular during the second and third trimesters. Red raspberry leaf is high in iron and may increase uterine tone.

Some natural health proponents believe raspberry leaf tea helps shorten labor, although at least one 2010 study doesn’t support this claim.

Peppermint leaf tea

Peppermint leaf is used to ease nausea, morning sickness, and gas. But it may worsen heartburn, which is a common issue during pregnancy.

Lemon balm tea

Lemon balm has an uplifting, citrus scent. It’s used to:

  • treat insomnia
  • reduce stress
  • ease anxiety
  • help digestion

Teas made from fruits and spices

Herbal teas made from dried fruits and spices (in amounts normally found in foods) are generally safe to consume. Try tea made from berries, apples, and citrus fruits.

Chamomile tea

This herb is often used to relieve stress and promote sleep. Sipping a cup of chamomile tea now and then is not likely to cause a problem during pregnancy, but drinking it regularly or in large quantities might.

Most healthcare providers advise completely avoiding chamomile when pregnant.

The herb may trigger uterine contractions and lead to miscarriage or preterm labor.

Chamomile can also cause a negative reaction if you’re allergic to plants in the Asteraceae family, such as:

  • ragweed
  • marigolds
  • daisies
  • chrysanthemums

Nettle leaf tea

Thanks to its nutritional profile, nettle leaf is found in many so-called pregnancy teas. But that doesn’t necessarily make it safe. The use of nettle leaf during pregnancy is controversial.

Some doctors recommend dried nettle tea as a pregnancy tonic during the second and third trimesters. Others claim tea made from fresh nettles may cause uterine contractions or lead to miscarriage or early labor.

Until research supports a definitive verdict, you may want to play it safe and avoid nettle leaf during pregnancy.

Dandelion leaf tea

This is another herb often found in pregnancy teas. Dandelion is high in vitamin A and calcium. It’s sometimes used to help with swelling during pregnancy.

But dandelion leaf is also a diuretic (which means it increases your urine volume) and should be used with extreme caution.

Pennyroyal tea

Pennyroyal is not recommended at any time during pregnancy. It may trigger uterine contractions and menstruation.

Licorice root tea

Licorice root is another herb to steer clear of when you’re pregnant. Heavy consumption may increase the risk of preterm labor.

Laxative herbal teas

These teas are used to treat constipation, a common pregnancy discomfort. They may also cause dehydration, disrupt your electrolyte balance, and cause uterine contractions.

Laxative teas are likely unsafe during pregnancy. If you’re pregnant and constipated, try increasing your fiber and fluid intakes, and moving more. You can also talk to your doctor about using a stool softener.

Slippery elm bark tea

Slippery elm bark may help relieve heartburn and nausea by coating the stomach. The inner bark of slippery elm may be safe during pregnancy when used in food amounts. But the outer bark may cause miscarriage.

It’s hard to confirm what type of slippery elm bark is in some herbal teas, so you may want to avoid it altogether while pregnant.

Teas made with chicory root

The chicory is potentially unsafe to consume in large quantities during pregnancy.

The ingredient might cause menstruation and miscarriage. Many commercial herbal teas contain roasted chicory root.

There’s not a lot of research on the use of herbal teas during pregnancy. As a result, most health organizations and doctors advise pregnant people to play it safe and avoid all herbs in quantities greater than food amounts.

When it comes to herbal teas, the saying “buyer beware” applies.

While there are herbal teas that may be safe to drink during pregnancy, it’s possible that drinking them in large quantities can be harmful.

If you want to try them, go for organic herbal teas made from a single herb, and discuss it with your doctor before use.