What Is Hyaluronic Acid and Why It Matters
Hyaluronic acid (HA) is a glycosaminoglycan, a molecule naturally produced by the body. It retains moisture, aiding skin hydration, elasticity, and repair. As noted by the American Academy of Dermatology, HA holds up to 1,000 times its weight in water. However, production decreases with age, contributing to dryness and fine lines. This makes HA a staple in skincare routines targeting dryness, sensitivity, and aging.
Types of Hyaluronic Acid: Molecular Weight Explained
HA exists in varying molecular weights. High-molecular-weight HA forms a protective barrier on the skin's surface, while low-molecular-weight HA penetrates deeper layers. Research published in the Journal of Drugs in Dermatology suggests that low-molecular-weight HA may trigger inflammation in sensitive skin. Always check ingredient lists for "hydrolyzed hyaluronic acid" (smaller molecules) or "sodium hyaluronate" (more stable form).
How to Choose the Right Hyaluronic Acid Product
Opt for sodium hyaluronate if dealing with sensitivity. Lightweight serums are ideal for layering under moisturizer or sunscreen. Those with oily skin should choose gel-based formulations, while dry skin benefits from thicker hybrids with ceramides. Avoid products with alcohol or fragrance, as noted by the National Eczema Association. Patch-test new products, especially if prone to irritation.
Layering Hyaluronic Acid: Boosting Absorption
Apply HA serums to damp skin to lock in moisture. Wait 30 seconds before layering moisturizer to let it absorb. For oc