1. It has a hemostatic effect. Overnight tea is rich in acids, which can prevent capillary bleeding, oral bleeding, gum bleeding, etc., and can be treated by gargling with overnight tea.

2. It has antioxidant and anti-cancer effects. Overnight tea is rich in saponin. In addition, if the tea is left for a long time, the oxidation of tea polyphenols will turn into reddish-brown tea pigments. Studies have shown that tea Both polyphenols and tea pigments have strong anti-cancer, antioxidant, and anti-inflammatory effects.

3. It has the effect of improving eyesight. The tea polyphenols in overnight tea have antibacterial and anti-inflammatory effects. If your eyes appear red, you can wash them with overnight tea several times a day.

4. Disadvantages of drinking overnight tea. Due to the high temperature in summer, the tea is prone to sourness and odor. If it is left aside for more than 24 hours, it is best not to drink it, otherwise it will cause diarrhea. In addition, if the tea soup is stored for a long time, the tea polyphenols, vitamin C and other nutrients in the tea will decrease, and the taste will also change a lot. Therefore, although overnight tea is harmless, under normal circumstances it is better to brew it and drink it as you go.