How does hyaluronic acid work in a hand cream compared to facial products?

Hyaluronic acid (listed here as hyaluron) functions as a humectant: it attracts water molecules and holds them on the skin's surface. On the hands, this is especially relevant because the skin is thinner than on most of the body, has fewer oil glands, and is repeatedly stripped by soap, sanitiser, hot water, and temperature changes. In a facial serum, hyaluronic acid is often formulated with lower molecular weights to penetrate deeper layers. In a hand cream, it typically stays on the upper stratum corneum, where it reduces the tight, parched feeling that follows washing or cold exposure. The effect is temporary — it lasts until the next hand wash or until the cream wears off — so reapplication is what maintains the smoother, more supple feel. The cream does not "plump" deep wrinkles or change skin structure; it improves surface hydration and the appearance of fine dehydration lines while the product is present.