Red Raspberry Leaf Tea: Pregnancy, Labor & Safety Facts

Short answer: Red raspberry leaf tea is popular in late pregnancy to “tone the womb” and shorten labor, but the best trial found no significant effect on labor length or the need for interventions. It does appear to be low-risk at moderate amounts for healthy pregnancies, though the UK’s food safety advisers describe the uncertainty as high. Talk to your midwife or doctor before you start, especially if your pregnancy is high-risk.

Red raspberry leaf (Rubus idaeus) comes from the same plant as the familiar summer berry. The dried leaves make a mild, slightly earthy tea that tastes a bit like black tea without the caffeine. For generations, midwives and herbalists have suggested it in the last weeks of pregnancy, and it’s now one of the most widely used herbal products in pregnancy.

This guide explains what the research says about red raspberry leaf tea for pregnancy and labor, when people start drinking it, how much was tested, who should avoid it, and how to make it. For more herbal teas, see our herbs and teas guides.

Red raspberry leaf tea at a glance

Plant: Rubus idaeus (red raspberry) leaves
Taste: Mild, earthy, like a light black tea; caffeine-free
Main use: Late pregnancy, to prepare for labor
Best evidence: One randomized trial in 192 women: no significant effect on labor
Safety view: UK advisers: risk “low but with high uncertainty”
Dose tested: 2.4 g of leaf a day in tablets, from 32 weeks

What is red raspberry leaf and how might it work?

Raspberry leaves contain tannins, flavonoids and other plant compounds. The traditional idea is that they “tone” the uterus, helping its muscle contract more efficiently during labor, so that labor is shorter and needs fewer medical interventions.

Lab studies on animal and human uterine tissue show raspberry leaf extracts do affect smooth muscle, but the results conflict: some found the muscle relaxed, others that it contracted, depending on the preparation and the test. That uncertainty is one reason experts are cautious about it.

What the research shows

There are only a handful of human studies, and they’re small. Each finding below carries an evidence label, explained in our editorial policy.

Shortening labor Limited evidence

The best study is a randomized, double-blind trial from Sydney, Australia, published in 2001. It found no statistically significant difference in the length of labor between women taking raspberry leaf tablets and those taking a placebo.

What the research actually found

Who: Low-risk women expecting their first baby; 192 completed the study
What: Raspberry leaf tablets (2.4 g of leaf a day, as two tablets) or a placebo
How long: From 32 weeks of pregnancy until labor
Result: No significant differences in the length of the first or second stage of labor, use of medicines to speed labor, forceps, cesarean sections or pain relief. No differences in blood loss, blood pressure or the babies’ health

Side effects such as nausea and diarrhea were reported in both groups at similar rates. The study suggests raspberry leaf is safe at this dose for low-risk pregnancies, but it didn’t show the benefits people hope for. Read the study.

An earlier study that looked back at women’s records found a shorter first stage of labor in raspberry leaf users, but the difference wasn’t statistically significant, and looking back at records can’t rule out other explanations. A 2021 systematic review of all the evidence, from 13 studies, called the support for raspberry leaf in pregnancy “weak”.

Fewer interventions during birth Limited evidence

Some women take raspberry leaf hoping to avoid forceps, vacuum delivery or a cesarean. The randomized trial found no significant difference in any of these. The 2021 review noted one study reported fewer interventions, but the result wasn’t statistically significant.

Starting labor Limited evidence

Raspberry leaf tea isn’t a way to bring on labor. There’s no evidence that it triggers contractions or brings labor forward, and the trial found no difference in how long pregnancies lasted.

Period pain and other traditional uses Limited evidence

Outside pregnancy, raspberry leaf is used traditionally for period cramps, diarrhea and sore throats, probably because of its astringent tannins. None of these uses has been tested in good-quality trials.

When do people start drinking it?

Most online advice says to start in the third trimester, usually around 32 weeks, which is when the trial began. Some sources suggest earlier. The UK Committee on Toxicity, which reviewed raspberry leaf in 2024, noted these recommendations but didn’t endorse any particular timing.

Because the leaves may affect the uterus, many midwives advise not using raspberry leaf earlier in pregnancy, and not at all in pregnancies with certain complications (see below). Ask your own midwife or doctor before starting, and tell them you’re taking it.

How much raspberry leaf tea is safe?

No official safe limit has been set. The only dose tested in a randomized trial was 2.4 g of leaf a day, which appeared safe for mother and baby. The UK Committee on Toxicity found online sources recommending up to about 10 g of dried leaf a day as tea, and up to 12 g when tea, tinctures and capsules are combined. That’s four or more times the amount tested.

Raspberry leaf amounts compared
Source	Amount of dried leaf a day	Notes
Randomized trial (2001)	2.4 g, as tablets	From 32 weeks; no harms found
One cup of tea (typical)	About 1–2 g (1 tea bag or 1 heaped tsp)	Varies with the product
Higher amounts advised online	Up to about 10 g	Not tested for safety
Tea, tinctures and capsules combined	Up to about 12.4 g	Not tested for safety

Sources: Simpson et al. (2001); UK Committee on Toxicity statement on raspberry leaf tea (2024). Tea-bag weights vary; check the pack.

A sensible approach is to stay close to the amount that was studied: one or two cups a day, not several, and not combined with capsules or tinctures.

Side effects and who should avoid it

In the trial, the most common side effects were nausea, vomiting, diarrhea and constipation, but these were almost as common in the placebo group. The UK review also noted that raspberry leaf extracts slowed some liver enzymes that process medicines in lab tests, and that a few products contained heavy metals, fungi or pesticide residues, mostly within legal limits.

Who should be careful

Early pregnancy: avoid it in the first and second trimesters unless your midwife or doctor advises otherwise.
High-risk pregnancies: if you’ve had a previous cesarean, bleeding in pregnancy, a history of preterm or very fast labor, a planned cesarean, twins, or your baby is breech, ask your care team before using it.
Medicines: because raspberry leaf may affect how the liver processes some drugs, tell your doctor or pharmacist if you take regular medicine.
Diabetes, including gestational diabetes: ask your care team, since herbal products can affect your management plan.
Labor signs: contact your maternity unit if you have regular contractions before 37 weeks, bleeding, your waters break, or your baby is moving less. Don’t rely on herbal tea.

How to make raspberry leaf tea

Use 1 tea bag or 1 heaped teaspoon (about 1 to 2 g) of dried leaf per cup.
Pour on 1 cup (240 ml) of freshly boiled water and cover.
Steep for 5 to 10 minutes, then strain.
Drink it warm, or chill it with ice and a slice of lemon.

Tip: the flavor is mild but a little bitter if steeped too long. A strip of lemon peel, a mint leaf or a small spoon of honey helps. Keep track of your total for the day if you also take raspberry leaf capsules.

Other ways to prepare for labor

If your goal is an easier birth, a few things have better evidence than raspberry leaf, and your midwife can help you choose:

Perineal massage: a Cochrane review found that massaging the perineum from about 35 weeks may reduce tears that need stitches, mainly for first-time mothers. Ask your midwife to show you how.
Staying active: regular moderate exercise in pregnancy, such as walking or swimming, is recommended for most women and supports overall fitness for labor.
Antenatal classes: learning breathing, positions and pain-relief options helps many people feel more prepared and in control.
A birth plan: talking through your preferences with your midwife ahead of time makes decisions easier on the day.

How to choose a good raspberry leaf product

Herbal teas and capsules aren’t checked by the FDA before sale, so quality varies.

Check the species: look for Rubus idaeus leaf, not a blend with other herbs you don’t know about.
Look for a batch number and testing: brands that test for heavy metals and pesticides usually say so. Organic certification reduces pesticide exposure.
Prefer plain leaf tea to “micronised” or concentrated products. The UK Committee on Toxicity said these may need separate safety evaluation because they could be absorbed differently.
Avoid “labor-starting” blends that add herbs such as blue or black cohosh, which carry their own safety concerns in pregnancy.

Read more about how we judge products in how we review supplements. See also our medical disclaimer.

Red raspberry leaf tea FAQ

Does raspberry leaf tea induce labor?

No. There’s no evidence that it starts labor or brings it forward. In the main trial, women taking raspberry leaf gave birth at the same point in pregnancy as those taking a placebo.

Can raspberry leaf tea cause a miscarriage?

There’s no good evidence that it does, but it hasn’t been properly studied early in pregnancy, and it may affect the uterus. That’s why it’s usually avoided before the third trimester.

How many cups of raspberry leaf tea should I drink a day?

There’s no official amount. The trial used the equivalent of about 1 to 2 cups’ worth of leaf a day. Ask your midwife, and avoid going far beyond that.

Can I drink raspberry leaf tea while breastfeeding?

It’s traditionally used after birth too, but there’s very little research on breastfeeding. Ask your midwife, doctor or pharmacist before using it regularly.

Is raspberry leaf tea the same as raspberry tea?

No. “Raspberry tea” is often a fruit-flavored blend made from berries or flavorings. Raspberry leaf tea is made from the plant’s leaves and tastes more like a mild black tea.