Guava leaves can soften blood vessels, lower blood lipid and blood sugar, and lower cholesterol. At the same time, it has the effects of resisting hypoxia and quickly relieving fatigue; At the same time, it is helpful to delay the peroxidation process of organisms and prevent chronic diseases such as cancer and heart disease. In guava leaves, it is found that there are many important aromatic secondary metabolites such as polyphenols. Experimental research shows that it is these phenolic compounds that give guava leaves many functions.
Psidium guajava Linn., a tree of Myrtaceae, is 13 meters high; The bark is smooth, gray and flaky; The shoots are angular and hairy. Leaf blade leathery, oblong to oval, acute or obtuse at the apex, nearly round at the base, slightly rough above, hairy below, 12-15 pairs of lateral veins, often sunken, and obvious reticulate veins; The petiole is 5 mm long. Flowers solitary or 2-3 arranged in cymes; The calyx tube is bell-shaped and hairy, and the calyx cap is irregularly split; Petals white; Stamens 6-9 mm long; The ovary is inferior, connate with calyx, and the style is as long as the stamens. Berry is spherical, oval or pear-shaped, with persistent sepals at the top, white and yellow flesh, hypertrophy of placenta, fleshy and reddish; There are many seeds.
native to south America. Cultivated in various parts of South China in China, the common species is Yi, which reaches Anning Valley in southwest Sichuan in the north and is born in wasteland or low hills. Fruit for eating; Leaves contain volatile oil and tannins, etc., which are used for medicine and have the effects of stopping dysentery, stopping bleeding and strengthening stomach. The leaves are boiled to remove tannins and dried in the sun for tea, which is sweet and has the effect of clearing heat.