![what is serum what is serum](https://biologydictionary.net/wp-content/uploads/2021/01/Blood-components.jpg)
Zeichner recommends smoothing a pea-sized amount over your clean, dry skin. Serum is typically applied as the second or third step in your skincare routine-directly after your cleanser and (if you use it) toner. If you're looking to add a serum to your skincare routine, knowing how (and when!) to apply it is key.
WHAT IS SERUM SKIN
BTW: Hydration is usually the name of the game when it comes to essences, so if you're extra dry (or, again, sensitive or prone to irritation), you might want to consider adding one to your routine (like the Shani Darden Skin Care Sake Toning Essence or the Cosrx Advanced Snail 96 Mucin Power Essence). That means essences are less likely to cause irritation if you have ultra-sensitive skin, says Dr. Essences-like serums-are also made with active ingredients, but they're typically more watery and a tad less concentrated. What's the difference between serum and essence? There's just one thing to keep in mind: Even though serums are an excellent addition to most skincare routines, they shouldn't replace any of your products-you'll definitely want to pair with your usual cleanser and moisturizer (and if you're applying in the morning, SPF). They can hydrate, soothe, protect, exfoliate, plump, you name it-it all just depends on your serum's active ingredients (more on that in a bit, though popular ingredients include hyaluronic acid, niacinamide, glycolic acid, and more.). One more time for the ppl in the back: Serums are completely customizable to your routine and specific needs, which means the benefits are vast. Keep reading for the ultimate guide, plus a few product recs you'll definitely want to add to cart.
WHAT IS SERUM FULL
So to get the full low-down on serums-including their long list of benefits, how exactly to apply them, and the best ingredients to look out for-I called up dermatologists Joshua Zeichner, MD, and Michelle Henry, MD, to find out everything there is to know.
![what is serum what is serum](https://imagesvc.meredithcorp.io/v3/mm/image?q=85&c=sc&poi=[1160%2C530]&w=2000&h=1000&url=https%3A%2F%2Fstatic.onecms.io%2Fwp-content%2Fuploads%2Fsites%2F35%2F2021%2F01%2F20%2Fserum-AdobeStock_285455224.jpg)
And since there are, like, thousands of serums on the market, they're super customizable (think: you can get super specific about your preferences and needs). Trust me: You definitely aren't alone if you get a little overwhelmed when you hear the word "serum." Like, wtf even is a serum-and how (slash why) should you add one to your skincare routine? Well, turns out serums are a lot less complicated than you might think: They're basically super-concentrated liquids that blast your skin with active ingredients (whether that's brightening niacinamide, hydrating hyaluronic acid, or zit-fighting salicylic acid) to treat everything from dry, sensitive skin to fine lines and wrinkles.