What you may have heard
Some claim that kombucha, a fermented tea drink, can prevent or even cure cancer due to its potentially detoxifying and immune-boosting effects.
What the science tells us
Kombucha is made by adding a Symbiotic Culture of Bacteria and Yeast (SCOBY) to fermented sweetened tea. While kombucha contains probiotics and antioxidants that may support overall health, research on its effects is extremely limited. Kombucha has not been proven to prevent or treat cancer in humans.
Epidemiological Evidence
There is no epidemiological evidence to support this claim.
Laboratory Evidence/Supporting Evidence
Kombucha has demonstrated antioxidant, antimicrobial, and anti-inflammatory effects in preclinical animal and in vitro (cell) studies (Abaci et al.), but these findings have not been replicated in humans.
How to reduce your risk
Kombucha can pose safety risks depending on how and where it is made.
- Lead poisoning has been reported when kombucha is brewed in ceramic pots, and harmful bacteria can grow if it is made in unsanitary conditions (Mayo Clinic). Purchase kombucha from reputable sources.
- If you are pregnant, breastfeeding, or have a weakened immune system, it is best to avoid kombucha due to the potential presence of bacteria and yeast.
Bottom line
Evidence to support the claim that kombucha can prevent or treat cancer is lacking. While kombucha has shown some health benefits in animal and in vitro studies, it is unclear whether these findings translate to humans. More research is needed.