What vitamins do you take while on a diet?

In the past, as a women's multivitamin

I used to make sure to eat one every day.

I stopped taking various vitamins and supplements a year ago.

It doesn't seem to have any particular effect, either.

I also heard that most of it is excreted through urine.

I hadn't eaten it since then.

But I just started a salad diet.

I feel like I have no energy and I'm running low.

Should I start taking a vitamin or supplement again?

I'm thinking about it.

Are there any good vitamin supplements to take while dieting?

If you've found anything effective, please recommend it.