How long does it take for a person to gain the energy from the vitamins taken in?

Question

I know cell respiration must take place, but how long will it take to reap the benefits of taking suppliments.

Answer 1

If you are taking additional vitamins because of a hypovitaminosis then the vitamins taken in are utilised the same day and physical benefits will be seen within a week.

But if you are taking an adequately balanced diet , and taking additional vitamin supplements these will be of no use to the body.

I am a medical doctor.