Guava trees, or Psidium guajava, are native to Central America and southern Mexico. These days, guava trees are grown in many different parts of the world. They are widely cultivated in Asia, especially in India for its fruit and growing demand for leaves for making tea. Guava leaf tea has long been used as a treatment for diarrhoea in both of these countries. In Japan, the tea is a government-approved food for managing blood sugar. Guava leaf tea may help prevent spikes in blood sugar and improve symptoms in people with type 2 diabetes. A 2010 review of evidence from clinical trials and animal studies suggests that guava leaf tea may help improve insulin resistance and lower blood sugar levels. As modern interest in traditional medicine has grown in recent years, guava leaf tea has drawn attention for its potential health benefits. As with many emerging subjects in medical research, not all of the guava leaf tea health claims have been proven. Still, there are a lot of demonstrated benefits within this beverage. Guava leaf tea is a great addition to your herbal regimen. It is especially useful if you suffer from menstrual pain, diabetes or as an anti-diarrhea support. Also, you might want to enjoy a cup daily to boost your immune system and protect yourself against common colds and flu.