“Serums are thin-viscosity topical products that contain concentrated amounts of active ingredients.
The concept with serum is that larger amounts of active molecules will potentially penetrate the skin’s surface for optimum effectiveness. Also, due to the higher concentration, it typically takes a shorter amount of time to see visible results.
Many people wonder why they can’t just use a moisturizer or face cream on their skin in place of a serum. While there is no hard and fast rule, research from 2011Trusted Source suggests using both, and layer accordingly.
Because the serum is lighter and delivers active ingredients to the skin quickly, it goes on first, after you’ve cleansed your skin.
But you also need to seal the serum to maximize the benefits, which is why a moisturizer or face cream is the next step.
Think of a serum as the secret weapon for treating skin issues like discoloration, dullness, fine lines, or acne — and a moisturizer as the key to hydrating your skin.