For years, guava leaf tea has been praised as a natural remedy for weight loss, balanced glucose, better digestion, and a stronger immune system.

But a recent medical report has surprised many: overconsumption may lead to serious side effects.

Researchers from the National University of Natural Medicine note that guava leaves are rich in antioxidants—flavonoids, polyphenols, and quercetin—that reduce inflammation, boost metabolism, and help regulate blood sugar.

However, drinking too much can sharply lower glucose levels, leading to dizziness, weakness, or fainting, along with cramps, diarrhea, or acid reflux.

Experts advise limiting intake to 1–2 cups per day and consulting a doctor if you are pregnant, diabetic, or have digestive or kidney issues.

When used in moderation, guava leaf tea may support cardiovascular and skin health—yet its benefits and risks remain a topic of heated debate online.