caffeine

Kola drinks owe their vogue to the caffeine which they contain.

Coffee owes its stimulating and refreshing qualities to caffeine.

The residue left in the retort is a mixture of caffeine and a resinous substance containing chlorophyll.

Caffeine separated by Oudry, and quinin by Pelletier and Caventou.

It's loaded with caffeine—a drug that is both a strong stimulant and a diuretic.

No booze or caffeine, either, not for the first couple days.

He swallowed an added dose of caffeine and looked at the page before him.

Caffeine, preferably in the form of caffeine-sodium-benzoate.

Besides, the caffeine in the coffee probably aided the pilocarpine.

There is more theine or caffeine in tea leaves than in coffee.