y personal experience ..

Multivitamin is a waste. Study show that human body don't need that much of multi everyday, and you already consume some from your food. So most of the time, the extra or unneeded vitamin will come out from your pee. You can see that if your pee in yellow color.

Best timing to take multi will be during the morning. If you take during the night, probably it will be waste during morning from your pee.

For me, i dont take it everyday. Only around 2 day/week.