Raspberry Leaf Tea in Pregnancy: What the Evidence Actually Says (and How to Actually Drink It)
Somewhere around the third trimester, someone will tell you to start drinking raspberry leaf tea. A midwife, a friend, a stranger in the comments. It’s one of the most widely used herbs in pregnancy, and it’s been handed down for generations as the thing you drink to get your body ready for birth.
As a doula and certified pregnancy and postpartum nutrition consultant, I get asked about it constantly. And like dates, it sits in that interesting space: not magic, not nonsense, and much more useful once you know what the research actually shows and how to fit it into your day without forcing down cups of something you don’t enjoy.
First things first: it doesn’t taste like raspberries
Raspberry leaf tea is made from the leaves of the raspberry plant, not the fruit. It tastes more like a mild, slightly earthy black tea, and it’s naturally caffeine-free.
The leaves contain tannins, flavonoids and small amounts of minerals like magnesium, potassium, calcium and iron. Nice to have, but not the reason people drink it.
Why is it such a pregnancy thing?
Raspberry leaf is traditionally known as a uterine tonic. The idea is that it helps strengthen the muscles of the uterus and tone the pelvic floor, so that when labour comes, contractions work more efficiently. Its effects are often credited to an alkaloid called fragarine.
One thing a lot of people notice is that their Braxton Hicks get stronger or more frequent once they start drinking it. Braxton Hicks are the “practice contractions” your body does in preparation for birth: irregular tightenings across the bump, usually with only mild cramping. They’re not thought to dilate the cervix, but they are your uterus warming up.
It’s also hugely popular. A UK survey found nearly 1 in 4 expectant mums had used it, and in Australia it’s as high as 38%.
What does the evidence actually say?
(scroll to the end for a list of sources)
The study everyone quotes
An Australian study* from 1999 looked back at 108 women and reported that those who drank raspberry leaf were:
- less likely to give birth preterm or post-term
- less likely to need their waters broken artificially
- less likely to have a caesarean, forceps or ventouse birth
It found no side effects for mothers or babies. Promising, but it was a small, retrospective study, which means it looked back at what happened rather than testing it properly. And when researchers later re-examined it, most of those differences weren’t statistically significant.
The randomised trial
The same team followed up with a proper trial* in 2001: 192 first-time mums took either raspberry leaf tablets or a placebo from 32 weeks.
- No harmful effects were found for mums or babies.
- It didn’t shorten the first stage of labour.
- The pushing stage was almost 10 minutes shorter, and there were fewer forceps births (19% vs 30%). But neither result was statistically significant, so we can’t say for certain it was the tea.
- Worth knowing: the trial used a fairly low dose (2.4g a day), so the jury’s still out on what a stronger daily amount might do.
The big picture
A 2021 review* of all the research concluded that raspberry leaf has real effects on uterine muscle and that human studies show it’s safe at normal doses, but that the evidence for the benefits is weak and needs more research. In 2024, the UK’s Committee on Toxicity* looked at it and concluded the risk is low, but with a lot of uncertainty because there just aren’t many studies.
In other words: promising, not proven.
And one thing to be really clear on: it won’t bring on labour. It’s not an induction method. It’s preparation.
When should you start?
Because it can ramp up Braxton Hicks, the general advice is to wait until 34 weeks. Some midwives (and the main trial) use 32 weeks, but 34 is a good, cautious place to start.
Start with one cup a day and build up from there. It’s not something you need in the first or second trimester.
How much?
For a proper strong brew, the traditional recipe is about 4g of dried leaf (roughly 2 heaped tablespoons) to 2 cups of boiling water, steeped for at least 20 minutes.
Yes, at least 20. This is the bit most people skip. A two-minute dunk gives you raspberry-leaf-flavoured water, not a strong infusion. Pop a lid or saucer on top, set a timer and walk away. Longer is fine too: if you’d rather set it and forget it, make a big batch in the evening, let it steep overnight and pop it in the fridge once it’s cooled.
Most people work up to 2–3 cups a day. Using tea bags? Same rule: give them at least 20 minutes, and use two bags per mug for a stronger cup.
If you really can’t get on with the taste, tinctures and capsules exist, but tea is the gentlest, most studied way in, and it counts towards your fluids.
A pregnancy nutrition lens (and a couple of things to know)
It counts towards your fluids
Your uterus is a muscle, and like any muscle it works best when you’re well hydrated. Late pregnancy is a thirsty time anyway, so a big jug of raspberry leaf tea doubles up as an easy way to drink more in the last few weeks.
Keep it away from your iron
Raspberry leaf contains tannins (like black tea), which may compete with iron for absorption. If you’re low in iron or taking a supplement, drink your tea at least an hour away from iron-rich meals and your iron tablet.
Check with your midwife first if:
- you’ve had a previous caesarean, or have one planned
- you have placenta praevia or any bleeding in pregnancy
- you’ve had preterm labour before, or very fast labours
- you have gestational diabetes, especially if you’re on insulin (one case report linked raspberry leaf tea to low blood sugar)
- you’re carrying twins or have a higher-risk pregnancy
- you take regular medication (raspberry leaf may affect how some medicines are processed)
No blanket rules, just context.
Actually nice ways to drink it (without getting sick of it)
As with dates, consistency beats creativity. Make it easy, and make it fun: a pretty glass, lots of ice, a bit of fruit. You’ll drink far more of it when it feels like a treat rather than a task.
The big batch iced jug (my favourite)
Brew a strong pot at night, let it cool, then fill a jug in the fridge with lemon slices, a few frozen raspberries and fresh mint. Pour over ice all day. It’s genuinely refreshing, especially if you’re overheating in late pregnancy.
Raspberry leaf “lemonade”
Strong cooled tea + squeeze of lemon + a little honey + sparkling water
Feels like a treat, not homework.
Make it a blend
- Peppermint: freshens it up and helps with heartburn
- Rosehip: a little fruitier, and rich in vitamin C
- Nettle: a traditional pairing, rich in iron and minerals
- Ginger and lemon: warming, good for a queasy day
Like a builder’s
Some people drink it strong with a splash of milk and a little honey. If that’s how you like your tea, go for it.
Raspberry leaf ice cubes for the labour bag
Freeze strong tea in ice cube trays. Drop them into water, coconut water or your labour-aid (coconut water, lemon, lime, honey and a pinch of salt) for something cold, hydrating and electrolyte-rich to sip between contractions.
Habit stack it
Fill a big bottle every morning and aim to finish it by dinner. Or swap your afternoon cup for it. Tying it to something you already do is what makes it stick.
And after birth?
Raspberry leaf doesn’t stop being useful once your baby arrives. It’s traditionally used postpartum to help:
- the uterus contract back to its pre-pregnancy size
- ease afterpains (those period-like cramps in the days after birth, often stronger while feeding)
- tone the pelvic floor during recovery
A big pot of raspberry leaf, nettle and rosehip is a classic postpartum brew to sip throughout the day. Dried raspberry leaf can also go into a sitz bath with calendula and lavender after a vaginal birth.
It also appears on traditional lists of herbs used to support milk supply, alongside fenugreek, fennel and blessed thistle. (If you want food-first ideas for supply, here are 7 foods that support milk supply.)
So… should you drink raspberry leaf tea?
If you’re 34+ weeks, have a straightforward pregnancy and enjoy it (or can learn to), raspberry leaf tea is a low-risk, food-first way to support your body in the final weeks.
It’s not the labour shortcut the internet makes it out to be. But it’s been used for generations, the safety data is reassuring, and it fits beautifully into a late-pregnancy approach that prioritises hydration, preparation and support over perfection.
Want to dig into the sources?
- A 1999 Australian retrospective study of 108 women reported raspberry leaf users were less likely to have preterm or post-term births, artificial rupture of membranes, caesareans or assisted births, with no adverse effects.
- A 2001 randomised controlled trial of 192 first-time mothers found raspberry leaf tablets from 32 weeks caused no harm, with a shorter second stage (by almost 10 minutes) and fewer forceps births (19.3% vs 30.4%) that weren’t statistically significant.
- A 2021 systematic integrative review of 13 studies concluded raspberry leaf affects uterine muscle and appears safe in human studies, but the evidence for benefits is weak.
- The UK Committee on Toxicity (2024) concluded the risk of raspberry leaf use in pregnancy is low, but with high uncertainty.
Prepping for postpartum? Stock your freezer
While you’re sipping your tea and packing the hospital bag, there’s one more bit of birth prep worth doing: filling the freezer. Our frozen lactation cookie dough comes as 8 pre-portioned dough balls that bake straight from frozen in 15 minutes. Bake one when you need a sweet something mid-feed, or the whole tray when visitors come round (with ice cream, obviously, you’re already at the freezer).
Stock up now, and it’s ready and waiting when the newborn days hit.
Prefer them baked? Order Milk it cookies
Written by Mel Mckechnie: doula and pregnancy & postpartum nutrition consultant
