Some research shows eating guava might help with blood sugar management. Several animal and test-tube studies discovered that guava leaf extract improved blood sugar levels, long-term blood sugar management, and insulin resistance. This is great news for anyone who has diabetes or is at risk of developing it.

A few human trials have also yielded promising benefits. One research of 19 persons found that drinking guava leaf tea after a meal reduced blood sugar levels. The effects might continue for up to two hours. In another trial of 20 participants with type 2 diabetes, consuming guava leaf tea decreased blood sugar levels after a meal by more than 10%.

Guavas may benefit heart health in a variety of ways. Many experts believe that guava leaves' high quantities of antioxidants and vitamins may help protect your heart from free radical damage. Guavas' greater potassium and soluble fiber levels are also suggested to contribute to better heart health.

Guava leaf extract has also been associated with reduced blood pressure, a reduction in "bad" LDL cholesterol, and an increase in "good" HDL cholesterol. Because high blood pressure and LDL cholesterol levels are associated with an increased risk of heart disease and stroke, consuming guava leaf extract may provide beneficial advantages. Furthermore, the fruit may be beneficial to heart health. A 12-week trial of 120 adults revealed that eating ripe guava before meals reduced blood pressure by 8–9 points, reduced total cholesterol by 9.9 percent, and increased "good" HDL cholesterol by 8%.

Many women suffer from dysmenorrhea, which is characterized by severe menstrual symptoms such as stomach pains. There is some evidence, however, that guava leaf extract may lower the intensity of menstruation cramps. A study of 197 women with painful symptoms discovered that ingesting 6 mg of guava leaf extract daily lowered pain severity. It looked to be more potent than certain pain relievers. Guava leaf extract may also help reduce uterine cramps.

Guava leaves were shown to be more efficient than Ibuprofen in relieving menstrual discomfort. It also improves blood flow and prevents clot menstruation during menstruation. Guava leaf tea was also thought to lessen uterine contraction, which is prevalent during menstruation and is the cause of unpleasant periods.

Guava leaf extract has been demonstrated to be an anticancer. Guava extract has been shown in animal and test-tube tests to inhibit and even stop the development of cancer cells. This is most likely due to the high quantities of strong antioxidants, which prevent free radicals, one of the primary causes of cancer, from destroying cells.

In one test-tube investigation, guava leaf oil was shown to be four times as effective as some cancer medications at preventing cancer cell development. Although the findings of in vitro trials are promising, this does not imply that guava leaf extract may be used to treat cancer in humans. Before any claims can be made, more research is required.

Low vitamin C levels have been related to an increased risk of infection and disease. Guavas, one of the highest food sources of vitamin C, are an excellent source of this nutrient. In fact, one guava delivers about double the RDA for vitamin C. This is about twice as much as you would receive from eating an orange. Vitamin C is essential for keeping a healthy immune system.

Although it has not been shown to prevent the common cold, vitamin C has been found to shorten the duration of a cold. It has also been connected to antibacterial properties. This implies that it aids in the elimination of harmful bacteria and viruses that might cause illnesses. Because vitamin C is rapidly drained out of your body, it's critical to receive enough through your food on a regular basis.