Question: what nutritional value does green tea have?
Answer: Catechins. Catechins are a type of polyphenol and are the main astringency component in green tea, long known as tannins. ... 
Caffeine. Drinking tea when tired from work or study can make a person feel refreshed. ... 
Amino Acid (Theanine) ... 
Vitamins. ... 
Vitamin B2. ... 
Vitamin C. ... 
Folic Acid. ... 
β-carotene.