Health Benefits of Guava

Scurvy: Guava can outdo many other fruits, including orange and other citrus fruits, in terms of its concentration of vitamin-C. A  deficiency of vitamin-C can cause scurvy, and proper intake of vitamin-C is the only known remedy for that dangerous disease. In fact, guavas contain 5X more vitamin-C than oranges, which are often heralded as the absolute best source of that beneficial vitamin.
Diarrhea & dysentery: Guava is very rich in astringents (compounds that make your gums feel tighter and fresher).  After you chew guava leaves, eat a raw guava, or use some guava-based toothpaste), your mouth feels healthier, and the astringent qualities also add substance to loose bowels and reduce symptoms of diarrhea. These astringents are alkaline in nature and have disinfectant and anti-bacterial properties, thus helping to cure dysentery by inhibiting microbial growth and removing extra mucus from the intestines. Furthermore, other nutrients in guava such as vitamin-C, Carotenoids and potassium, strengthen and tone the digestive system while simultaneously disinfecting it. Guava is also beneficial in treating gastroenteritis for the same reasons stated above.
Thyroid Health: Guavas are a good source for copper, which is an important part of regulating thyroid metabolism by helping to control hormone production and absorption. The thyroid gland is one of the most important glands in the body for regulating hormones and organ system function, so guava can help balance your health in many ways.
Brain Health: Another of the tremendous positive benefits of guavas is the presence of B3 and B6 vitamins. B3 (also known as niacin) can increase blood flow and stimulates cognitive function. B6 is a great nutrient for brain and nerve function. Therefore, eating guava can help you increase brain function and sharpen you focus.