How to say "caffeine" in Japanese
Choosing the right word
- nounThe common, default word for the substance caffeine itself, used across everyday and scientific contexts; this is what you want for coffee, tea, energy drinks, and health advice.
- nounA less common synonym for カフェイン, corresponding to the chemical names thein and theine; for caffeine in ordinary use, カフェイン is almost always the word you want.
- 茶素ちゃそnounA less common name for the same substance, associated with the caffeine of tea; for caffeine in any ordinary context, カフェイン is the word you want.
「カフェイン」 is the common word for caffeine in any context; 「テイン」 and 茶素 are less common alternative names for the same substance, so 「カフェイン」 is almost always the word you want.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese equivalents
