If you’re navigating gestational diabetes and also sipping your way through pregnancy, you’ve probably heard about raspberry leaf tea. It’s often recommended in the third trimester for its supposed benefits—but like with most things in gestational diabetes life, it’s normal to wonder: Is it actually safe? Could it help… or hurt?
—Julija, HIgedi founder
Raspberry leaf tea is usually considered pregnancy-safe for many people in the third trimester, and it’s carb-free on it's oown so it typically won’t spike blood sugar. But if you’re high-risk or on insulin/metformin, talk to your provider first and monitor closely.
Quick note: I’m not a medical professional, so always check with your provider before adding herbal teas—especially if you’re high-risk or on medication.
Raspberry leaf tea, also known as red raspberry leaf tea, is made from the leaves of the red raspberry plant (Rubus idaeus). This herb has a long history of use in herbal medicine, especially for pregnancy support. Traditionally, it’s believed to:
Strengthen the uterine muscles
Help tone the uterus to prepare for labor
Potentially reduce labor duration (some swear by this!)
Plus, it’s caffeine-free, hydrating, and naturally rich in nutrients like iron, calcium, and magnesium — which is always a win.
If you’re wondering whether this could affect your blood sugar (or your uterus)… you’re not overthinking it. This is exactly the kind of “pregnancy tip” that deserves a second look.
The short answer: For most, raspberry leaf tea is generally considered safe during pregnancy—especially in the third trimester and with your provider’s approval. There’s no strong evidence it raises blood sugar, and it’s a hydrating, carb-free drink that can replace sugary beverages. However, it can stimulate uterine contractions, so many experts recommend waiting until the third trimester to start drinking it.
Current evidence that raspberry leaf tea can lower blood sugar in gestational diabetes is very limited and largely based on a single case report plus small mechanistic studies—not on large, high-quality trials:
Case report: One published case describes hypoglycemia and reduced insulin needs after starting raspberry leaf tea in a woman with GDM, which resolved when the tea was stopped and recurred when restarted. (Diabetes Care, 2001)
Small studies: There are some small, short-term studies (not in pregnant women with GDM) that suggest raspberry leaf may modestly blunt post-meal glucose and insulin spikes.
Reviews: Reviews of herbal teas in pregnancy note raspberry leaf is widely used, but highlight limited, low-quality evidence on both benefits and metabolic effects, and recommend caution with high-risk pregnancies or when combined with medications.
So what does that mean in real life?
The evidence isn’t strong enough to say “this definitely helps” or “this definitely harms.” But it is enough of a signal that if you’re on insulin or metformin, it’s worth being extra cautious and monitoring closely (with your provider’s OK), rather than assuming it’s automatically harmless.
Hydration: Staying hydrated is crucial for blood sugar control and overall health. Raspberry leaf tea can help you stay hydrated without added sugars.
Note: If plain water is giving you the ick right now (very relatable), you might also like this roundup of GD-friendly drinks beyond water—ideas that feel like a treat without messing with your numbers.
Nutrient Boost: No carbs, no calories, just some helpful minerals like magnesium and iron.
Soothing Ritual: A warm cup of tea can be incredibly grounding when you’re dealing with food tracking, glucose checks, and general pregnancy exhaustion.
There are lots of easy (and blood sugar–friendly!) ways to enjoy raspberry leaf tea—hot or cold, plain or blended. Here are some go-to methods:
Classic Brew: Steep 1 teaspoon of dried raspberry leaf in hot water for 5–10 minutes. The tea is typically drunk by sipping 1–2 cups daily, usually starting in the third trimester to help prepare for labour and birth. It is recommended to start slowly with a small amount and gradually increase your intake as tolerated. Afternoon or evening tends to work best for some. Consuming raspberry leaf tea in the third trimester may help decrease the duration of the second stage of labour and support a smoother birth process.
Iced Raspberry Tea: Brew a stronger batch, let it cool, then pour over ice with lemon slices or a few fresh berries. Perfect for warm days or a refreshing change.
Slightly Sweetened: If your blood sugar allows, a touch of honey or sugar-free syrup, a cinnamon stick, or a slice of fresh ginger can add depth without much carb impact. (Or use a GD-friendly sweetener like stevia or monk fruit)
Tea Blends: Mix it up with other pregnancy-safe, caffeine-free herbs like lemon balm, peppermint, or ginger for variety and flavor.
Safety Tip: Consuming raspberry leaf tea is not recommended during the first trimester due to potential risks. Overconsumption can lead to intense contractions, so it should be consumed with caution. Always consult your healthcare provider before you drink raspberry leaf tea.
We asked the HIgedi community how they’re sipping raspberry leaf tea without spiking—and here’s what real moms shared:
Simple & Soothing: “Hot with lemon and just a tiny bit of honey—keeps my numbers in range.”
Fruity & Fun: “I brew a few bags, then mix with diet cranberry juice!”
Flavor Boost: “Unsweetened passion or orange tea blends beautifully with it and gives it some punch.”
Ice Cold & Crisp: “I make a batch and chill it with fresh berries or a splash of sugar-free juice like Minute Maid Light.”
Straight-Up: “I drink it plain. It's not winning any awards for taste, but it's not awful—and it does the job.”
Cold Brew Style: “I do it ‘cold brew’ style—fill a jar with water and 2 tea bags, then leave it in the fridge overnight to drink in the morning or next day.”
Summer Iced Tea: “I made red raspberry leaf iced tea at the end of my GD pregnancy last summer and it was honestly delicious. I’d brew it overnight, pop it in the fridge, add a tiny splash of sugar-free raspberry cocktail syrup, and pour it over ice. So refreshing!”
Many also lean on safe, sugar-free sweeteners for that little extra taste without messing with blood sugar.
It’s important to pick a raspberry leaf tea that’s pure, safe, and blood sugar-friendly. Here’s what to look for:
100% pure red raspberry leaf without fillers or added herbs
Organic and pesticide-free for pregnancy safety
Loose leaf or unbleached tea bags—whichever you prefer
No added sugars or artificial flavors that could affect blood sugar
Check ingredients carefully if it’s a blend, especially for GD safety
FGO Organic Red Raspberry Leaf Tea Bags — eco-friendly, caffeine-free, and great value with 100 bags
Traditional Medicinals Organic Raspberry Leaf Herbal Tea — widely trusted and well-reviewed for pregnancy
Earth Mama Organic Raspberry Leaf Tea Bags — gentle and specifically designed for pregnancy support
Always seek professional advice and check with your provider before starting herbal teas — especially in early pregnancy or if you're on insulin.
Most mamas wait until the third trimester (usually around 32–34 weeks) before introducing raspberry leaf tea.
Start slow — maybe one cup a day — and see how your body responds.
Keep an eye on blood sugar the first few times, just to be sure it agrees with you and doesn’t affect insulin sensitivity.
Raspberry leaf tea is fairly common in pregnancy; in one survey, 23.7% of pregnant women reported using it.
If you’re making broader diet changes for blood sugar, get professional advice first.
If you try it, tell us how you’re drinking yours in the HIgedi community—plain, iced, blended, “I need it to taste like something” style… all welcome here. 🫶
And if you're also wondering how to incorporate dates while following a gestational diabetes diet — here's a guide on Dates & Gestational Diabetes: How to Safely Prep for Labor.
1. Is raspberry leaf tea safe for gestational diabetes?
Generally yes, in the third trimester for women not on medication—but always check with your provider.
2. Can I drink raspberry leaf tea if I'm on insulin or metformin?
The evidence is very limited. Don't start without medical advice, and only use it with professional advice and monitoring if you take insulin or metformin.
3. Does raspberry leaf tea lower blood sugar?
There's a possible effect, but it's not proven or well-studied in gestational diabetes. Caution is best.
4. When should I start drinking raspberry leaf tea if pregnant?
Most experts recommend waiting until 32–34 weeks (third trimester), and starting with a small amount.
5. How much raspberry leaf tea is safe to drink?
Usually 1–2 cups per day in the third trimester, but start slow and see how your body responds.
6. Can raspberry leaf tea cause contractions or early labor?
It may stimulate uterine contractions, which is why it's best avoided in the first and second trimesters unless your provider says otherwise.
7. Is raspberry leaf tea safe if I have a high-risk pregnancy or complications?
If you have a high-risk pregnancy, a history of preterm birth, or other complications, avoid raspberry leaf tea unless your clinician advises otherwise.
8. Does raspberry leaf tea interact with other medications besides insulin or metformin?
There's little research on interactions, so always check with your provider if you're on other medications.
9. What are the side effects of raspberry leaf tea?
Possible side effects include mild nausea, laxative effects or loose stools, and uterine cramping if overconsumed.
10. Can raspberry leaf tea replace my prenatal vitamins?
No—while it contains some minerals, it's not a substitute for prenatal vitamins or any prescribed supplements.
11. What does raspberry leaf tea taste like?
It's herbal, slightly grassy, and not sweet—many moms blend it with other flavors or sweeteners.
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