Kombucha
Everyday exposureFood & drinkAlso called · 8 names▾▴
kombucha tea, fermented tea, raw kombucha, unpasteurized kombucha, homemade kombucha, kombucha pregnancy, fermented drink, probiotic tea
Drinks
General information · effects depend on amount, timing, and how it is used. About these sources
Research strength: 1 / 5
MotherToBaby advises against kombucha during pregnancy because fermentation can leave alcohol and the amount may change, while unpasteurized or home-brewed drinks may carry foodborne germs. AAFP describes kombucha as less studied in pregnancy, and Anantachoke et al. review production and fermentation rather than pregnancy outcomes. TTB says its 0.5% alcohol-by-volume cutoff is a federal regulatory threshold and that fermentation may continue after bottling; it is not a pregnancy-specific cutoff. Current CDC and NHS food lists do not name kombucha, though they give pasteurization or heating options for some listed foods. Ask your provider about your situation.
Last reviewed: 2026-10-18
Sources
- MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing QuestionsTeratology service
- American Family Physician: Pregnancy Myths and Practical Tips
- TTB: Kombucha
- Anantachoke et al., Foods 2023: Kombucha Beverages Produced from Fruits, Vegetables, and PlantsUS government
- CDC: Preventing Listeria InfectionUS government
- NHS: Foods to avoid in pregnancyUK government
Research strength: 1 / 5
MotherToBaby advises against kombucha during pregnancy because fermentation can leave alcohol and the amount may change, while unpasteurized or home-brewed drinks may carry foodborne germs. AAFP describes kombucha as less studied in pregnancy, and Anantachoke et al. review production and fermentation rather than pregnancy outcomes. TTB says its 0.5% alcohol-by-volume cutoff is a federal regulatory threshold and that fermentation may continue after bottling; it is not a pregnancy-specific cutoff. Current CDC and NHS food lists do not name kombucha, though they give pasteurization or heating options for some listed foods. Ask your provider about your situation.
Last reviewed: 2026-10-18
Sources
- MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing QuestionsTeratology service
- American Family Physician: Pregnancy Myths and Practical Tips
- TTB: Kombucha
- Anantachoke et al., Foods 2023: Kombucha Beverages Produced from Fruits, Vegetables, and PlantsUS government
- CDC: Preventing Listeria InfectionUS government
- NHS: Foods to avoid in pregnancyUK government
Research strength: 1 / 5
MotherToBaby advises against kombucha during pregnancy because fermentation can leave alcohol and the amount may change, while unpasteurized or home-brewed drinks may carry foodborne germs. AAFP describes kombucha as less studied in pregnancy, and Anantachoke et al. review production and fermentation rather than pregnancy outcomes. TTB says its 0.5% alcohol-by-volume cutoff is a federal regulatory threshold and that fermentation may continue after bottling; it is not a pregnancy-specific cutoff. Current CDC and NHS food lists do not name kombucha, though they give pasteurization or heating options for some listed foods. Ask your provider about your situation.
Last reviewed: 2026-10-18
Sources
- MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing QuestionsTeratology service
- American Family Physician: Pregnancy Myths and Practical Tips
- TTB: Kombucha
- Anantachoke et al., Foods 2023: Kombucha Beverages Produced from Fruits, Vegetables, and PlantsUS government
- CDC: Preventing Listeria InfectionUS government
- NHS: Foods to avoid in pregnancyUK government
Kombucha — Breastfeeding
Research strength: 1 / 5
MotherToBaby discusses kombucha during breastfeeding, including alcohol and caffeine, but does not report kombucha-specific infant outcome studies. MotherToBaby and the NHS say caffeine can reach breastmilk and that higher intake may affect infant rest or sleep; the NHS recommends no more than 200 mg per day and notes that babies respond differently. In a small crossover study of 11 mother-infant pairs, maternal caffeine intake of 500 mg per day did not significantly change infant heart rate or sleep; the study did not test kombucha. Product alcohol and caffeine amounts can vary with the ingredients and fermentation. Ask your provider about your situation.
Last reviewed: 2026-10-18
Pregnancy
MotherToBaby advises not drinking kombucha during pregnancy because alcohol can remain after fermentation and product levels may change; it also raises concern about possible contamination in unpasteurized or home-brewed products. AAFP describes kombucha as less well studied in pregnancy. Its broad statement that CDC advises against all unpasteurized foods is wider than the current CDC list, which names specific foods and does not mention kombucha. TTB's 0.5% alcohol-by-volume threshold is a regulatory cutoff, not a pregnancy-specific exposure threshold. A 2026 review of ethanol labeling includes fermented drinks such as kombucha and reports that ethanol levels and labeling rules vary; it does not provide pregnancy-outcome data. No kombucha-specific pregnancy outcome study was identified in the sources reviewed.
Breastfeeding
MotherToBaby discusses kombucha during breastfeeding and notes that caffeine can pass into milk. The NHS also says caffeine can reach the baby through breastmilk, that higher intake may cause restlessness or reduced sleep, and that babies respond differently; it recommends no more than 200 mg per day. In a 1985 crossover study, 11 mother-infant pairs were studied while maternal caffeine intake was 500 mg per day for five days; the study found no significant difference in infant heart rate or sleep. The study was small, short, and tested caffeine rather than kombucha. The available sources do not describe a kombucha-specific breastfeeding study.
MotherToBaby and TTB describe kombucha as tea and sugar fermented with bacteria and yeast. Fermentation produces ethanol, and TTB notes that the amount can continue to rise after bottling if fermentation continues. A 2026 review reports that kombucha composition varies with fermentation conditions. MotherToBaby notes that caffeine comes from the tea used and can vary by product; no single caffeine amount applies to every drink.
What was tested
AAFP's discussion is a clinical review of food precautions, not a kombucha pregnancy-outcome study. Anantachoke et al. (2023) reviewed fermentation and preclinical findings, not pregnancy outcomes. A randomized 2025 trial studied 330 mL of kombucha per day for eight weeks in healthy adults aged 18 to 71 and measured urine and plasma metabolites; it did not assess pregnancy or breastfeeding outcomes. Ryu (1985) studied 11 mother-infant pairs in a short crossover trial of maternal caffeine intake, not kombucha. The PubMed search for kombucha with pregnancy, lactation, or breastfeeding terms over the past 12 months returned one article about alcohol labeling, not a pregnancy outcome study.
How general unpasteurized-food guidance applies to kombucha in pregnancy
- Source A says
- MotherToBaby advises against kombucha in pregnancy because alcohol levels can vary and unpasteurized products may carry foodborne germs. AAFP calls kombucha less studied and states that CDC recommends avoiding all unpasteurized foods. (MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing Questions, American Family Physician: Pregnancy Myths and Practical Tips)
- Source B says
- Current CDC and NHS pages list specific foods and options such as pasteurized products or heating; neither page names kombucha. FoodSafety.gov also discusses specific unpasteurized drinks and foods rather than kombucha. (CDC: Preventing Listeria Infection, NHS: Foods to avoid in pregnancy, FoodSafety.gov: People at Risk - Pregnant Women)
- Why they differ
- The pregnancy-specific kombucha warning comes from MotherToBaby and the AAFP review, while current public food-safety pages focus on named foods and do not explicitly address kombucha. The guidance differs in scope, and silence about kombucha is not an endorsement.
- What the evidence shows overall
- The available evidence supports a precaution about variable alcohol and the handling of unpasteurized products, but it does not establish pregnancy outcome effects from kombucha itself. Pasteurization addresses the bacterial concern described by MotherToBaby, while alcohol content remains a separate product-specific question.
Caffeine and infant sleep or restlessness during breastfeeding
- Source A says
- MotherToBaby and the NHS say caffeine can pass into breastmilk and higher intake may affect an infant's irritability or sleep. (MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing Questions, NHS: Breastfeeding and diet)
- Source B says
- Ryu's crossover study found no significant differences in infant heart rate or sleep during the caffeine and no-caffeine periods, even though maternal intake was 500 mg per day. (Ryu 1985: Effect of maternal caffeine consumption on heart rate and sleep time of breast-fed infants)
- Why they differ
- The sources describe a possible response at higher intake, while the small, short trial found no significant change in two measured outcomes. The trial did not study kombucha and cannot resolve effects across different infant ages or caffeine amounts.
- What the evidence shows overall
- The evidence is limited and not specific to kombucha. The NHS advises tracking total caffeine and notes that infants may respond differently; the available trial does not show a measurable sleep or heart-rate change at the tested intake.
- MotherToBaby describes store-bought, pasteurized kombucha as an option that reduces the bacterial concern, while separately advising against kombucha during pregnancy because alcohol content may be unclear. (MotherToBaby)
- MotherToBaby's example mentions water, carbonated fruit spritzers, and juice as alternatives to kombucha; it presents these as an individual's choices rather than clinical evidence. (MotherToBaby)
- The NHS recommends limiting total caffeine to no more than 200 mg per day while breastfeeding and notes that babies respond differently to caffeine. (NHS: Breastfeeding and diet)
General research, not specific to pregnancy.
A 2025 trial studied kombucha in healthy adults by measuring metabolites in urine and blood, not disease outcomes or pregnancy and breastfeeding outcomes. It does not establish a general health benefit.
- Lloyd et al. tested 330 mL of kombucha per day for eight weeks in healthy adults aged 18 to 71 and measured urinary and plasma metabolite profiles; the trial did not test clinical disease outcomes. (Lloyd et al., 2025: Daily Consumption of Kombucha Influences the Urinary and Plasma Metabolome)
Experiences from moms and non-medical voices. Not medical evidence.
- MotherToBaby: Kombucha and Pregnancy: Answers to Your Brewing QuestionsTeratology serviceSecondaryPage dated 2020-02-14
- American Family Physician: Pregnancy Myths and Practical TipsSecondaryPage dated 2020-10-01
- Anantachoke et al., Foods 2023: Kombucha Beverages Produced from Fruits, Vegetables, and PlantsUS governmentPrimaryPage dated 2023-04-27Independent check
- TTB: KombuchaSecondaryPage dated 2019-08-13Independent check
- CDC: Preventing Listeria InfectionUS governmentSecondaryPage dated 2025-01-31Independent check
- FoodSafety.gov: People at Risk - Pregnant WomenSecondaryPage dated 2026-10-05Independent check
- NHS: Foods to avoid in pregnancyUK governmentSecondaryPage dated 2026-06-15Independent check
- NHS: Breastfeeding and dietUK governmentSecondaryIndependent check
- Albaseer et al., 2026: Ethical dilemmas in food labeling and ethanol in foodsUS governmentPrimaryPage dated 2026-06-25Independent check
- Pereira 2026: Kombucha as a Bioactive Functional BeverageUS governmentPrimaryPage dated 2026-03-17
- Lloyd et al., 2025: Daily Consumption of Kombucha Influences the Urinary and Plasma MetabolomeUS governmentPrimaryPage dated 2025-10-13
- Ryu 1985: Effect of maternal caffeine consumption on heart rate and sleep time of breast-fed infantsUS governmentPrimaryIndependent check
Last reviewed 2026-10-18
Independent check 2026-10-18
Not yet clinician-reviewed
Ask your provider about your situation.