There are 0 human trials of hibiscus tea in pregnancy, and a PubMed search for pregnancy, uterus or offspring returns only 19 records. We read all 19, and the relevant ones are mostly rat studies.
That is thin ground for a confident yes or no, so this page shows what the caution rests on, and what to do if you already had a cup.
Quick Answer: Is Hibiscus Tea Safe During Pregnancy?
It is best avoided. There are 0 human trials in pregnancy. Rat studies found later puberty and lower sperm counts in the offspring of mothers given hibiscus, and hibiscus infusions carry aluminium, up to 1.2 mg per litre. There is no evidence that an occasional cup drunk before you knew causes harm, but mention it to your midwife.
Key Takeaways
- 0 human trials have tested hibiscus tea in pregnancy or breastfeeding.
- Rat offspring showed delayed puberty in 3 studies by 1 research group.
- A 2007 rat study found hibiscus reduced, not increased, uterine contractions.
- Hibiscus infusions contained up to 1.2 mg of aluminium per litre.
- Authors advised pregnant women to keep hibiscus infusion under 1 litre daily.
Related Products
What the Evidence Base Looks Like
When a pregnancy question has 0 human trials behind it, the answer has to come from animals, chemistry and caution. This is what the 19 PubMed records actually contain, so you can judge the caution for yourself rather than take it on trust.
| What kind of record | What it found |
|---|---|
| Pregnant or nursing rats, offspring followed | Later puberty, extra weight gain, lower sperm counts in males |
| Rat uterus, injected extract (2007) | Contractions reduced, dose by dose |
| Isolated rat uterus (1991) | Mixed: relaxed a contracting uterus, stimulated a resting one |
| High-dose extract late in rat pregnancy (2025) | Damage markers in newborn rats |
| Survey of 402 nursing mothers in Ghana | Roselle leaves eaten in soup to boost milk |
| Human pregnancy trials | 0 |
Several of the 19 records turned out to be about something else entirely, such as skin cells or viruses. For everything else hibiscus is studied for, see what the research says hibiscus does.
Does Hibiscus Cause Contractions?
Popular answers often say hibiscus can stimulate the uterus or bring on labour. We could not find a study showing that. The 2 laboratory studies of rat uterus point mostly the other way, toward relaxation, and neither involved a pregnant woman.
- 2007 study: injected extract reduced the rate and strength of rat uterine contractions.
- 1991 study: relaxed a rhythmically contracting rat uterus, stimulated a resting one.
- In people: 0 studies.
- What that means: no basis for saying it brings on labour, and none for calling it safe.
The 2007 effect grew with the dose.[1]Inhibitory effects of aqueous extract of Hibiscus sabdariffa on contractility of the rat bladder and uterus — Canadian Journal of Physiology and Pharmacology (2007) View source The 1991 tissue study found effects in both directions.[2]Investigation of the antispasmodic potential of Hibiscus sabdariffa calyces — Journal of Ethnopharmacology (1991) View source
What the Rat Offspring Studies Found
The most consistent signal concerns pups born to rats that drank hibiscus during pregnancy or nursing. These were extracts given as the animals' drinking water, at strengths far above a cup or 2 a day, so the transfer to people is uncertain.
- Pregnant rats: 0.6 or 1.8 g per 100 mL as drinking water; pups reached puberty later.
- Suggested mechanism: mothers drank and ate less, with higher sodium and stress hormone.
- Male offspring: lower sperm counts after exposure from mid-pregnancy through nursing.
- Late pregnancy, high dose: damage markers in newborns at 500 to 2,000 mg/kg.
The puberty finding tracked raised maternal sodium and corticosterone.[3]Mechanism of the delayed puberty onset in offspring of rats that consumed aqueous extract of Hibiscus sabdariffa during pregnancy — Nigerian Journal of Physiological Sciences (2008) View source The sperm finding came from doses of 250 and 500 mg/kg.[4]Safety assessment of Hibiscus sabdariffa after maternal exposure on male reproductive parameters in rats — Drug and Chemical Toxicology (2016) View source
The 2025 study used a hydroalcoholic extract, not tea, and its authors advised use only under professional supervision.[5]Genomic and Cytotoxic Damage in Wistar Rats and Their Newborns After Transplacental Exposure to Hibiscus sabdariffa Hydroalcoholic Extract — International Journal of Molecular Sciences (2025) View source
Aluminium in the Cup
A less obvious concern is what hibiscus infusions carry. In a 2013 analysis of 6 herbal teas, hibiscus infusions held the most aluminium and manganese, and the authors named pregnant women among the people who should limit it.
- Aluminium: up to 1.2 mg per litre of infusion.
- Suggested ceiling: no more than 1 litre a day for sensitive groups.
- Infants under 6 months: exclude it entirely, the authors said.
- Strength: a stronger brew means more of everything in it.
The same paper flagged children with chronic kidney failure.[6]Aluminium and other elements in selected herbal tea plant species and their infusions — Food Chemistry (2013) View source Strength matters too, and how to brew it at a sensible strength sets out the grams per cup that trials used.
If You Already Drank Some
Many people drink hibiscus without knowing it, in agua de jamaica, sorrel, fruit teas and iced blends. If you had some before you knew you were pregnant, or by accident since, there is no human evidence that an occasional cup causes harm.
- Stop: there is no reason to continue.
- Do not panic: the rat findings came from daily drinking-water doses.
- Tell: your midwife or doctor at the next visit.
- Check labels: fruit and berry teas often contain hibiscus.
Fruit teas and iced blends are the usual hidden sources, so the label check is the 1 habit worth keeping.
Late Pregnancy, Labour and Breastfeeding
Some people ask about hibiscus near their due date, hoping it might help labour along. There is no evidence that it does, and the laboratory data point toward relaxation of the uterus rather than contraction.
- At 39 weeks: no evidence of benefit; avoid it.
- To bring on labour: not supported; ask your midwife about proven options.
- Breastfeeding: no human data; nursing rats on hibiscus raised pups with later puberty.
- Milk supply: a traditional use, never tested in a trial.
In a 2020 survey of 402 nursing mothers in Ghana, roselle leaves in groundnut soup were among the most common foods used to boost milk.[7]Special foods and local herbs used to enhance breastmilk production in Ghana: rate of use and beliefs of efficacy — International Breastfeeding Journal (2020) View source That is tradition, not a trial.
If you take blood pressure medicine in pregnancy, the interaction risks in the full list of side effects apply as well.
Safer Drinks While You Wait
If hibiscus was your caffeine-free habit, you do not need to give up a warm cup, only the herb. Choose drinks whose pregnancy safety is better understood, and clear any herbal tea with your midwife first.
- Water with citrus or cucumber: no herbs involved.
- Ginger tea: ask your midwife first.
- Decaffeinated tea: a little caffeine only.
- Fruit teas: read the label, because many contain hibiscus.
Keep it simple until your midwife has looked at anything herbal.
After Pregnancy and Breastfeeding
Hibiscus is a reasonable drink to come back to once you have finished breastfeeding, if your blood pressure and medicines allow it. At that point the blood pressure trials, not the rat offspring studies, are the evidence that matters.
- Wait: until breastfeeding has finished.
- Check: your blood pressure and any medicines.
- Start: at a measured strength, 1 source at a time.
- Review: after 6 weeks.
When that time comes, remedy's hibiscus capsules offer a fixed amount, but not before.
Do Not Use Hibiscus, and Speak to Your Midwife or Doctor, If
- You are pregnant or trying to conceive
- You are breastfeeding
- You are near your due date and hoping to bring on labour
- You take blood pressure or diabetes medicine during pregnancy
- You have been drinking several cups a day and feel unwell
Frequently Asked Questions
Is hibiscus tea safe to drink during pregnancy? +
It is best avoided. 0 human trials exist, and rat studies found effects on offspring, including later puberty and lower sperm counts in males.
Can I drink hibiscus tea at 39 weeks pregnant? +
It is not recommended. There is no evidence it helps labour, and 1 rat study found it reduced uterine contractions. Ask your midwife about safe options at 39 weeks.
What teas should I avoid while pregnant? +
Hibiscus is 1 to avoid, along with any herbal tea your midwife has not cleared. Fruit and berry blends often hide hibiscus, so check the ingredient list.
What not to drink during pregnancy to avoid miscarriage? +
Alcohol is the clearest 1 to avoid. There is no human evidence linking hibiscus to miscarriage, but with 0 human trials it is still best skipped.
Does hibiscus tea cause contractions? +
No study shows that. A 2007 rat study found hibiscus reduced uterine contractions, and a 1991 tissue study found mixed effects. 0 human studies exist.
I drank hibiscus tea before I knew I was pregnant. Should I worry? +
There is no human evidence that an occasional cup causes harm. The rat findings came from daily drinking water at 0.6 to 1.8 g per 100 mL. Stop now and mention it at your next appointment.
Can I drink hibiscus tea while breastfeeding? +
It is best avoided. There is no human data, and in rats whose mothers drank hibiscus while nursing, female pups reached puberty later in 2 studies.
Does hibiscus tea affect estrogen? +
There is no human evidence that it does. A 2012 rat study found no change in uterus weight in immature females, a standard test for estrogen-like activity.
Is agua de jamaica the same as hibiscus tea? +
Yes. Agua de jamaica, sorrel, bissap, karkade and zobo are all made from Hibiscus sabdariffa calyces, so the same pregnancy caution applies to all 5.
Related Reading
Related Products
