Теория:

To speak about vitamins, you need the appropriate vocabulary. Part 1
 
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balance – баланс

behaviour – поведение

combination – сочетание

component – компонент

contain – содержать

daily – ежедневный

diet – диета

dietary – диетический

eyesight – зрение

fuel – топливо

function – функция, функционировать

growth – рост

leafy vegetables – листовые овощи

liquid – жидкость
 
 
Examples:
 
What vitamins are good for the eyesight?

We often eat leafy vegetables for supper.
Источники:
https://www.babycenter.com/0_the-lowdown-on-childrens-vitamins_64355.bc