Here's Harvard Medical School's A-to-Z Guide on Serum

The world of skincare can get quite confusing. Too many products to possibly count, so many directions, and endless ingredients. Whether you're a beauty junkie or not, every now and then we all need a straightforward refresher to clear things up and bring us back to the basics. For starters, what exactly is serum?

Harvard Medical School recently published an informative guide on serum and everything you need to know. You've probably seen so many serums perusing while websites and beauty aisles, and you may or may not have found the right one for you. Believe me, it takes time. As a beauty editor, it wasn't until this year that I finally found my holy grail serum that I shared in this essay. I've had to break up with bottle after bottle, so you're not alone if you share the same struggle.

Abigail Waldman, MD, instructor of dermatology at Harvard Medical School, shares in the article the difference between serum from a typical lotion, moisturizer, or cream. Serums are concentrated ingredients made to instantly seep and absorb into the skin. "I definitely recommend serums for anyone who is concerned about aging," Waldman told Harvard. "It's a really good way to get extra anti-aging effects, more than your typical moisturizer and sunscreen," says Waldman. Below is the serum guide you've been looking for.