Layering Hyaluronic Acid Serums

Hyaluronic acid is a humectant. Its primary function is to draw atmospheric moisture into the stratum corneum, the outermost layer of the skin. Because it works by holding water, the order in which you apply it relative to other serums determines its efficacy.

Correct layering prevents evaporation and maintains skin surface hydration. This guide defines the placement of hyaluronic acid within a multi-product routine.

1. Cleanse the surface. Use a mild, pH-balanced cleanser to remove debris and oils. Rinse with lukewarm water. Do not pat the skin completely dry; leaving it slightly damp is the first step in successful humectant application.
2. Apply to damp skin. Dispense the hyaluronic acid serum directly onto your damp forehead and cheeks. Distribute it with your fingertips using a pressing motion. The presence of water on your skin allows the hyaluronic acid to bind to moisture immediately.
3. Layer your active serums. If you are using other water-based serums, apply them now. Hyaluronic acid should generally sit after more viscous, concentrated actives but before occlusive moisturizers. Ensure each product has fully absorbed before proceeding to the next.
4. Seal with a moisturizer. Hyaluronic acid alone will evaporate in low-humidity environments. Apply a moisturizer containing emollients or occlusives immediately after your serum to create a physical barrier. This traps the moisture held by the hyaluronic acid against your skin.
5. Final check. Ensure the product is evenly distributed across the face and neck. Check for any pilling, which may indicate the products are not compatible or were applied in too thick a layer. Your skin should feel plump and soft.

The efficacy of a humectant relies entirely on the presence of an occlusive seal.