How do you spell Caffeine?
Correct spelling
caffeine
Remember: caff-E-ine ends like protein, not -iene like hygiene.
Why is caffeine spelled this way?
From German Kaffein, derived from Kaffee (coffee). The -EINE ending follows German chemical naming. Two F's, one N — the stimulant in the spelling matches the jolt in the cup.
Common misspellings of caffeine
caffienecafeinecaffeenecafffeine
Example
She avoided caffeine after 2 PM to ensure a good night's sleep.