Does Tea Give You Less of a Buzz Than Coffee? What the Evidence Really Shows
Coffee or tea in the morning? For some people, the choice is mainly about taste. For others, it comes down to finding a drink that improves alertness and concentration without causing too much nervousness, jitteriness or an overly intense feeling of stimulation. Tea is often described as a gentler alternative to coffee. But is that really because it contains less caffeine?
The answer is generally yes, but there is an important qualification: tea usually contains less caffeine than coffee, yet it can still significantly stimulate alertness and attention. The way a person responds depends not only on the drink itself, but also on the amount consumed, the way it is prepared and individual sensitivity to caffeine.
Coffee generally contains more caffeine
The first difference is straightforward. A typical serving of coffee usually contains considerably more caffeine than a serving of tea.
According to the U.S. Food and Drug Administration, a 12-ounce serving of regular brewed coffee typically contains between 113 and 247 mg of caffeine. By comparison, the same volume of black tea contains around 71 mg and green tea around 37 mg. These are only typical values because caffeine content can vary considerably depending on the type of coffee or tea, the amount used, brewing or steeping time and serving size.
This difference helps explain why some people experience a stronger stimulant effect after drinking coffee than after drinking tea.
However, tea should not be considered a caffeine-free or non-stimulating drink. Its caffeine also acts on the central nervous system and can temporarily improve alertness and certain aspects of cognitive performance.
Why can tea feel gentler?
Tea has another distinctive component that may contribute to this difference: L-theanine, an amino acid naturally found in tea leaves.
L-theanine has been studied for its potential effects on attention, mood and stress responses. A 2025 systematic review and meta-analysis of randomized controlled trials examined the effects of theanine alone as well as the combination of theanine and caffeine. The findings suggested that the combination may improve certain short-term measures of attention and mood, although the researchers emphasized that additional research is needed.
Experimental studies have also suggested that theanine may modify some of the arousal and stress-related effects of caffeine. This could help explain why some people describe tea as producing a more “calm” form of alertness compared with coffee.
This should not be interpreted as a universal rule. People can respond very differently to the same amount of caffeine or the same beverage.
Less caffeine does not necessarily mean less effective
An important question is whether tea is actually less effective at maintaining alertness.
Research comparing tea and coffee has found that both beverages can help maintain certain aspects of alertness and psychomotor performance during the day. Some differences between the two beverages have nevertheless been observed, particularly when caffeine doses are taken into account.
In other words, tea can still be an effective source of mental stimulation even though it generally provides less caffeine than coffee.
The combination of a lower caffeine dose and naturally occurring theanine may be one reason some people prefer tea when they want a milder stimulant effect.
Does coffee necessarily cause more nervousness?
Not for everyone.
The response to caffeine depends on several factors, including the amount consumed, regular caffeine intake, body weight, medications, medical conditions and individual sensitivity. The FDA therefore notes that the amount considered “too much” can vary from one person to another.
In sensitive individuals, high caffeine intake can cause nervousness, jitters, anxiety, headaches, nausea or stomach discomfort. Caffeine can also interfere with sleep, particularly when consumed late in the day or in large amounts.
Tea is not completely free from these effects. A strongly brewed tea or several cups throughout the day can still result in a substantial caffeine intake.
What about sleep?
Sleep is another important consideration.
An earlier study comparing tea and coffee consumption found that caffeinated beverages could affect sleep onset and sleep quality, with the effects depending partly on the dose. The researchers nevertheless observed that tea produced similar alerting effects while being less likely to disrupt sleep under the conditions tested, probably in part because the tea provided less caffeine.
That does not mean tea can necessarily be consumed freely at night. Someone who is particularly sensitive to caffeine may find that even a moderate amount delays sleep.
Green tea, black tea or coffee: which has the most caffeine?
There is no single fixed caffeine content for each beverage.
Brewed coffee is generally the most concentrated of the three in the examples provided by the FDA. Black tea usually contains less caffeine, while green tea generally contains less still. However, preparation can make a substantial difference.
A tea brewed for a long time with a large quantity of tea leaves can therefore contain considerably more caffeine than a lightly brewed cup. Likewise, some coffee preparations are much more concentrated than others.
For that reason, it is more useful to consider the actual amount of caffeine consumed rather than simply labeling one drink as “strong” and another as “weak.”
How much caffeine is considered reasonable?
For most adults, the FDA states that up to about 400 mg of caffeine per day is an amount not generally associated with negative effects, while emphasizing that individual tolerance varies.
This does not mean that people should aim to consume 400 mg every day. It is a general reference level for most healthy adults.
People who are particularly sensitive to caffeine may experience unwanted effects at much lower doses. Pregnant women, people taking certain medications and those with particular medical conditions may also need individualized advice about caffeine consumption.
So, does tea give you less of a buzz than coffee?
In many cases, yes, mainly because a typical serving of tea contains less caffeine than a typical serving of coffee.
But saying that tea simply “excites less” is an oversimplification. Tea still contains caffeine and can increase alertness. Its L-theanine content may also contribute to a different subjective experience, potentially combining alertness with a calmer feeling, but the effect depends on the individual and the dose.
The choice therefore depends largely on what someone is looking for. A person seeking a stronger stimulant effect may prefer coffee, while someone looking for a more moderate form of stimulation may find tea more comfortable.
In both cases, quantity matters. What ultimately determines the stimulant effect is not simply whether the drink is called tea or coffee, but how much caffeine is actually consumed.
