![]() For the general public, the Mayo clinic recommends that 200-300 mg of caffeine daily is safe, but that 500-600 mg daily can cause a number of health problems. The caffeine content of tea, by dry weight, is also higher than that of coffee, because a smaller amount of tea is used to brew a single cup, contrasting with an ounce or about 30 grams, used to brew a typical cup of coffee.Ĭaffeine Molecule, Public Domain How much caffeine is safe to consume?To place these figures in perspective, the current consensus of the American Congress of Obstetricians and Gynecologists is that it is safe for pregnant women to consume up to 200 mg of caffeine daily. The authors of this study concluded that the most often-cited figures on caffeine content of coffee tend to underestimate the actual caffeine content. A recent study of commercial coffee vendors in Australia found that roughly a quarter of espresso samples contained over 120 mg of caffeine per serving, about 1/8th contained 167 mg or more per serving, and the highest contained 214 mg per serving. the standard "small" serving size is 12 ounces. However, it is important to note that these figures are per brewed cup, not per serving, and in the case of large serving sizes, and also with espresso and other heavily-caffeinated drinks, the caffeine per serving can be considerably higher. In most cases, a cup of tea has much less caffeine than coffee a typical cup of coffee contains 80-135 mg of caffeine. One study of the caffeine content of teas (after steeping) found that the caffeine content of tea varied from about 3 mg/g to 30mg/g, which would result in a cup of tea containing between 7.5 mg and 75 mg of tea. A teaspoon of dry tea leaves tends to weigh around 2.5 grams, the amount usually used to make a single cup, although this varies by the type of tea. ![]() Photo by David Wilmot, licensed under CC BY 2.0.The caffeine content of tea varies widely from one tea to the next, and depends on how the tea is brewed, but tends to be within the range of 15-70mg per 8 ounce cup.Ĭaffeine can also be measured in terms of milligrams of caffeine per grams of dry tea. The amount of caffeine in tea tends to be low, but is high enough to be a matter of concern for people drinking large quantities of tea, as well as people sensitive to caffeine for medical reasons. The most well-known plants containing caffeine are tea ( Camellia sinensis), coffee, and yerba maté.Īlthough tea has a number of health benefits, heavy caffeine use has unpleasant effects and negative impacts on health, including anxiety and insomnia, and for this reason many tea drinkers seek to moderate their caffeine intake. Caffeine is water soluble, and is extracted into the brewed cup when preparing tea, coffee, or other caffeinated beverages. About caffeine Caffeine is a naturally-occurring stimulant, found in several plants. This article outlines the caffeine levels in various teas, explores the factors influencing caffeine content, notes which teas are highest and lowest in caffeine, and dispels common myths about tea and caffeine. Any color of tea (black, green, white, etc.) can be high or low in caffeine.Īll true teas from the Camellia sinensis plant contain caffeine.It is a myth that green or white teas are always lower in caffeine than black.Coffee tends to have 80-135 mg caffeine / cup.
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