If you have ever found yourself surprised by the effects of the coffee you are drinking – or by the lack of effects – you might be surprised to learn the caffeine content of your drinks of choice.

Starbucks is one of the favorite coffee destinations of most Americans. While Starbucks offers plenty of specialty drinks, one of their most popular is the Frappuccino. You will espcially see people drinking this drink – and might even be especially tempted by this drink yourself – during the hot summer months, but did you know that the Frappuccino has no caffeine in it? The Frappuccino is made with a coffee-flavored powder, but it does not actually contain any real coffee. If you are wanting something to wake you up during the summer instead of just a cold drink, think twice before purchasing a Frappuccino.

Espresso is another area where one of the big caffeine myths comes from. You might even find a barista making a comment along the lines of, “You must really need to stay awake” if you ever order and espresso-based drink and ask for an extra shot to be added. Actually, while espresso contains more caffeine per ounce than regular coffee, most espresso drinks only contain a couple ounces of espresso. One example is a venti latte at Starbucks – the largest size offered – which only comes with three shots (or ounces) of espresso. As a shot of espresso typically contains between 35 and 50 milligrams of caffeine, this amounts to between 105 and 150 milligrams of caffeine.

On the other hand, a single cup of coffee will typically give you between 115 and 150 milligrams of caffeine. This means that the 20 ounces of coffee in a Starbucks venti coffee gives you over 300 milligrams of caffeine! In other words, a venti coffee actually contains more than double what you will find in a venti espresso drink!

You might actually went to consider espresso drinks if you are especially sensitive to caffeine. You just need to know how many shots are in a drink, and you can be aware of how much caffeine you are consuming. On the other hand, if you are wondering why caffeine is not making a big difference for you, you might be getting a lot less caffeine than you actually thought!