The time when you can take vitamins most effectively.

Vitamin C, commonly taken as a multivitamin, is a water-soluble vitamin, so it is not restricted by time, but please avoid taking it on an empty stomach.
It is better to consume it at regular times during or after a meal, rather than on an empty stomach.

It is said that lutein, a nutrient beneficial for the eyes, is also best absorbed when taken after breakfast, as this time prevents heartburn.

Vitamin D, which can be obtained by exposure to sunlight through outdoor activities, is a fat-soluble vitamin.

Therefore, consuming it during a meal where you can eat fat can increase the absorption rate.
However, since eating it late in the evening can interfere with sleep, it is best to eat it in the morning if possible.