Can One Gram of Sodium Hyaluronate Really Lock In Thousands of Times Its Weight in Water?

Sodium hyaluronate is widely recognized for its excellent moisturizing abilities, and common advertising claims that "one gram of sodium hyaluronate can lock in thousands of times its weight in water." While this claim is based on experiments, it needs to be understood rationally in actual use.

The water-absorbing principle of sodium hyaluronate lies in its molecular structure. It is a natural polysaccharide with numerous carboxyl and hydroxyl groups on its molecular chains, which adsorb water through hydrogen bonds. When dissolved in water, the molecular chains expand, forming a three-dimensional network structure that can hold hundreds of times its own weight in water, which is the source of experimental data.

However, this data is usually measured under ideal conditions—pure water environment, without interference from other formulations. Therefore, in skincare products, the amount of water that sodium hyaluronate can lock in is affected by concentration, formulation, and skin environment, and is far from reaching the advertised figures.

More importantly, the value of sodium hyaluronate lies not only in its theoretical "water-locking capacity" but also in its ability to form a moisturizing film, strengthen the skin barrier, and improve skin feel. High molecular weight sodium hyaluronate primarily forms a water-locking film on the surface, while low and ultra-low molecular weight sodium hyaluronate can penetrate the stratum corneum to provide multi-layered hydration. A scientifically combined molecular weight allows the skin to benefit from both immediate and long-lasting hydration, rather than relying on theoretical numerical values.

Understanding the water-absorbing mechanism and experimental background of sodium hyaluronate helps in making rational judgments about skincare effects, avoiding being misled by exaggerated marketing claims, and enabling the selection of appropriate molecular weights and dosages in formulations to achieve hydration results that more closely meet the skin's needs.