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

The vitamin: NatureWise Vitamin D3 ($14)

Why people take vitamin D3: Helps support the immune system, healthy muscle function, and bone health.

What reviewers are saying: Pressed with organic olive oil, this non-GMO vitamin helps you get your daily dose of vitamin D3. It has over 6,500 reviews on Amazon and a 4.8-star rating. This reviewer loved that the pill was easy to take. "I've been taking this supplement for about a year and it's been great. My vitamin D level is now normal and the pill is made of quality ingredients, which I like. It's also very small and easy to swallow."