8 Top-Rated Vitamins That Will Give You a Boost — All From Amazon

The vitamin: MegaFood Iron Supplement ($14)

Why people take iron supplements: Upping your iron intake can help fix low energy levels.

What reviewers are saying: Some women can suffer from low iron levels, so if you need a boost, try this top-rated supplement. One customer was able to up her iron levels without changing her diet. "These have really brought my levels up without any side effects, and I ate all the same things."