Ultra-concentrated liquid shots like DynaPep have the most caffeine per ounce. Some strong coffees have more caffeine than energy drinks.

The amount of caffeine we consume depends on the drink's caffeine content, serving size, and how fast we drink it. A small espresso has a lot of caffeine, but a large coffee can have more.

Caffeine is in coffee beans, tea leaves, and some soft drinks. The FDA says 400mg of caffeine per day is safe for healthy adults, but amounts vary by drink and brand.

DynaPep has the most caffeine per ounce.

Devil Mountain Black Label is the strongest brewed coffee.

Death Wish Coffee has a huge amount of caffeine.

Starbucks Blonde Roast has a lot of caffeine.

Dunkin' coffee can have almost as much caffeine as the daily limit.

Espresso drinks have a lot of caffeine in a small cup.

Frozen and specialty coffee drinks can be very strong.

Cold brew often has more caffeine than regular coffee.

Energy drinks have different amounts of caffeine.

Tea, soda, and hot chocolate usually have less caffeine.

Caffeine affects the human body in many ways.

DynaPep has 714.3mg of caffeine per fluid ounce, which is a lot.

Caffeine per ounce can be misleading. A small serving can have more caffeine than a full cup of coffee.

The FDA warns against highly concentrated caffeine products.

Devil Mountain Co. Black Label has 129.6mg of caffeine per ounce.

A normal cup of coffee usually has 95-200mg of caffeine.

A normal cup of coffee and a high-caffeine coffee may look the same, but have different amounts of caffeine.

Some products stand out because they have a large serving size. Death Wish coffee has about 472mg of caffeine per 8-ounce cup.

Coffee consumption can be tricky. People think in terms of one cup, but a cup is not always 8 ounces.

Starbucks has several drinks with a lot of caffeine. A 16-ounce Grande Blonde Roast has 360mg of caffeine.

Lighter roasts can have more caffeine than darker roasts.

Bold flavor does not always mean more caffeine.

Dunkin' Donuts Large Coffee with Turbo Shot has 395mg of caffeine.

Caffeine amounts vary across manufacturers, beans, and brewing time.

Espresso has the highest caffeine concentration per ounce among coffee drinks.

Shock Coffee Triple Latte has 231mg of caffeine per 8 ounces.

Espresso is like a compressed file: small but dense.

Caffeine blocks adenosine receptors in the brain, which helps with alertness and cognitive function.

Panera's Frozen Mocha has 267mg of caffeine in 16 fluid ounces.

Sugar and chocolate can make it easy to miss the caffeine content.

Cocoa-based drinks usually have less caffeine than coffee, but can still contribute to total caffeine intake.

Cold brew often has between 100-200mg of caffeine per 8 ounces.

A larger cold brew serving can deliver more caffeine than a 1-ounce espresso shot.

Serving size is important. A giant cold brew can have a lot of caffeine.

Bean choice matters. Robusta coffee beans have more caffeine than Arabica beans.

The caffeine content of coffee depends on factors like bean variety, roast level, and brewing time.

Energy drinks have varying amounts of caffeine, from 50-500mg per serving.

Red Bull has 80mg of caffeine in an 8.4-ounce can.

These beverages are marketed for energy, but too much caffeine can disturb sleep and increase anxiety.

Tea usually has less caffeine than coffee, but is not caffeine-free.

Soda and cola usually have less caffeine than tea or coffee.

It is easy for total caffeine consumption to add up from several small beverages.

Your body notices the total caffeine intake, not just the source.

Caffeine works on the brain by blocking adenosine receptors, which helps with alertness and energy.

Caffeine has an average half-life of 5 hours and can vary widely.

Too much caffeine can interfere with sleep, raise stress hormones, and cause side effects like insomnia and anxiety.

According to MedlinePlus, side effects can include insomnia, headaches, and anxiety.

The smartest question is not only what drink has the most caffeine, but also how much caffeine is in the serving you consumed.

The American College of Obstetricians and Gynecologists advises pregnant adults to stay below 200mg of caffeine per day.

We created this article with AI technology and fact-checked it.

The article was edited by a HowStuffWorks editor.