1. Children under the age of 4: Kombucha contains trace amounts of caffeine, alcohol, and acids that may be harmful to young children.
2. Pregnant or breastfeeding women: Kombucha may contain harmful bacteria or substances that could harm the developing fetus or infant.
3. People with weakened immune systems: The bacteria and yeast in kombucha could potentially cause infections in people with weakened immune systems, such as those with HIV/AIDS, cancer, or on immunosuppressive medications.
4. People with liver disease: Kombucha contains small amounts of alcohol, which could exacerbate liver disease.
5. People with diabetes: Kombucha contains sugar, which could potentially cause spikes in blood sugar levels in people with diabetes.
6. People with yeast allergies: Kombucha is made with yeast, which could potentially trigger an allergic reaction in people with yeast allergies.
7. People with alcohol addiction: Kombucha contains small amounts of alcohol, which could trigger cravings or relapse in people with alcohol addiction.
8. People with digestive disorders: The acids in kombucha could potentially exacerbate symptoms in people with digestive disorders such as acid reflux, irritable bowel syndrome (IBS), or inflammatory bowel disease (IBD).
9. People with low blood pressure: Kombucha could potentially cause a drop in blood pressure in people with low blood pressure.
10. People on certain medications: Kombucha could potentially interact with certain medications, including blood thinners and antibiotics.
11. People with a history of lactic acidosis: Kombucha could potentially exacerbate symptoms in people with a history of lactic acidosis.
12. People with a history of metabolic disorders: Kombucha could potentially interfere with the absorption of certain nutrients in people with a history of metabolic disorders.
13. People with a history of dental problems: Kombucha contains acids that could potentially cause tooth decay or erosion in people with a history of dental problems.
14. People with a history of kidney stones: Kombucha contains oxalates, which could potentially contribute to the formation of kidney stones in people with a history of kidney stones.
15. People undergoing chemotherapy or radiation therapy: Kombucha could potentially interfere with the absorption or effectiveness of chemotherapy or radiation therapy.