Matcha is high in caffeine, ranging between 19-45 mg per 1/2 teaspoon serving, compared to 11–24 mg per 1/2 teaspoon serving in other green teas. Many factors can influence how much caffeine ends up in your matcha green tea drink, from the time of harvest to the age of the leaves. Older leaves contain less caffeine than younger leaves. The amount of caffeine in matcha also depends on the tea variety, weather conditions during the growing season, and how matcha is brewed.u003cstrongu003eu003csupu003eu003ca href=u0022https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7796401/u0022 target=u0022_blanku0022 rel=u0022noreferrer noopeneru0022u003e1u003c/au003eu003c/supu003eu003c/strongu003e