This is the 12718th most frequent Russian word.
кофеина
"Caffeine" - a stimulant substance found in coffee, tea, and other products.
The word 'кофеина' is used here as the direct object of the verb 'нужно', indicating the substance required for alertness.
Мне нужно больше кофеина для бодрости.
I need more caffeine to feel refreshed.
The word 'кофеина' is employed as part of a possessive structure, suggesting the quality or utility of the substance in the study context.
Гарвардское исследование подтвердило пользу кофеина.
A Harvard study confirmed the benefits of caffeine.
The word 'кофеина' in this sentence is used as a descriptor for a noun, depicting the specific substance whose consumption is mentioned.