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So Let's start by clarifying a bit: let's begin by saying that teina does not exist; or rather it is used as a synonym for caffeine. So if we want to be correct and a bit picky, we must say that tea does not contain theine but caffeine. It seems quite clear as a concept, right? Caffeine, as everyone knows, is an active ingredient like many others found in plants. Let's say that this active ingredient is found in not many plants: coffee, tea, guayusa, yerba mate, and some other medicinal herbs, but in very low quantities. The plants that have the most are coffee (as many may have guessed) an..