Three to four weeks before harvest, we reduce the light in the greenhouse so that the tea leaves are in the shade. Covering the leaves causes the tea leaves to produce more chlorophyll and the amino acid L-theanine. Greenhouse green tea contains more antioxidants per gram than any other vegetable or fruit. EGCG (epigallocatechin gallate) is a type of antioxidant found in abundance in greenhouse tea, which belongs to the catechin category. Catechins prevent the formation of free radicals in the body, protecting cells and molecules from disease and keeping you healthy.Greenhouse green tea compared with ordinary green tea: Compared with normal brewed green tea, it has 137 times more antioxidant properties.-In terms of nutrient content, one cup of greenhouse green tea is equivalent to 10 cups of ordinary brewed green tea.-It contains many antioxidants, including the powerful antioxidant EGCG.