Drinking guava leaf tea can offer numerous health benefits, but overconsumption may lead to unwanted side effects. When taken in large amounts, guava leaves—rich in tannins—can irritate the digestive system. Common symptoms may include constipation, nausea, bloating, or abdominal discomfort, especially in people with sensitive stomachs or pre-existing digestive issues.
Excessive intake may also place stress on the liver and kidneys, as these organs process the bioactive compounds in guava leaves. For those with underlying liver or kidney conditions, consuming too much tea might contribute to fatigue or reduced detoxification efficiency over time.
One of guava leaf tea’s known benefits is its ability to regulate blood sugar. However, drinking too much can cause blood sugar to drop too low, particularly in people using insulin or medications for diabetes. Symptoms of low blood sugar include shakiness, dizziness, sweating, and, in more severe cases, fainting — highlighting the need for moderation.
Guava leaf tea can also interact with certain medications, including those for diabetes, high blood pressure, and blood thinning. These interactions might either enhance or reduce a drug’s effectiveness, potentially leading to health complications. People on regular medication should consult a healthcare provider before incorporating the tea regularly into their routine.