Daily How Much

A 12-ounce can of regular Mountain Dew contains 54 mg of caffeine, about half the caffeine in a standard 8-ounce cup of brewed coffee.

50 mg of caffeine is a small amount—roughly the caffeine in a cup of black tea or a can of soda.

Five shots of espresso contain about 315 mg of caffeine, based on 63 mg per standard shot.

200 mg of caffeine is a moderate single dose for healthy adults, roughly equivalent to one 12-ounce cup of strong coffee or about two cups of black.

160 mg is a moderate caffeine dose, roughly the amount in one 12-oz cup of coffee.

150 mg of caffeine is a moderate, single-serve dose — about what you get in a standard 12-ounce cup of brewed coffee or a 16-ounce energy drink.

120 mg of caffeine is a moderate dose, roughly the amount in a standard 8-ounce cup of brewed coffee or a single shot of espresso.

100 mg of caffeine is a moderate dose — roughly one 8-oz cup of brewed coffee or two 12-oz cans of cola — well within the FDA’s 400 mg daily limit.

For most healthy adults, up to 400 mg of caffeine per day—roughly two to three 12-ounce cups of coffee—is generally considered safe and not.

Caffeine can raise cortisol levels by roughly 30 to 50 percent above baseline, with the strongest effects seen in people who don’t consume it.