Oh, serums. How you confuse thee.

One of the most popular questions we get from people trying to get their skincare routines on, and poppin’ is “what is a serum?” The second is, “do I need it?”  The answer to the second question is, it depends. The answer to the first is a little more complicated.

So, What Is A Serum?

A serum is a lightweight, concentrated, skincare product used after cleansing and toning and before your moisturizer.  In general, serums are made with ingredients the can penetrate deeply into the outer layers of the skin to deliver an active, nourishing concentration of components to treat specific skincare concerns. Serums have smaller molecules than those found in your moisturizer and work to help correct such concerns as hyperpigmentation, fine lines, wrinkles, uneven tone and texture, sallowness, loss of firmness and more.  If you look at most skincare lines and regimens, the most expensive item in that line is often the serum. That’s because, in theory, this is the product with the highest concentration of active ingredients.

Can A Serum Be Oil Based?

“Generally no. Serums are designed for deeper penetration of ingredients. Although oil can be incredibly nourishing and beneficial for the skin, when formulated with an oil base the oil molecules have a hard time delivering the concentrated ingredients.”  – licensed esthetician and skin care expert, Melissa Lekus.

At What Age Should You Incorporate A Serum Into Your Skincare Routine?

According to Lekus, “adding a serum is less about age and more about compliance. I recommend introducing a serum whenever you are comfortable having multiple steps in your skincare routine.”  We agree with Melissa and will add that you should introduce a serum into your routine the moment you realize your skin isn’t responding as well to just your basic moisturizer. For some folks, the first thing they may notice is the skin might lack radiance or moisture. Read more