Question: are all herbal teas diuretic?
Answer: Despite the diuretic effect of caffeine, both herbal and caffeine-containing teas are unlikely to dehydrate you. To have a significant diuretic effect, caffeine needs to be consumed in amounts greater than 500 mg — or the equivalent of 6–13 cups (1,440–3,120 ml) of tea ( 7 , 8 ).