Please recommend nutritional supplements for middle school students.

He is a male student with very picky eating habits.

I can't eat kimchi at all and hardly eat fruit.

I don't eat it!! I rarely eat vegetables, maybe only once in a while when I eat meat~

I only like meat~ I tried hard to change my eating habits, but I failed ㅠㅠ I also don't eat rice very well...

I need to grow taller and have enough stamina to study~~ Please recommend some nutritional supplements that are helpful during adolescence!!