Good evening. The difference is that the former is an organic acid and the latter is its sodium salt. Sodium hyaluronate is more soluble in cold water than hyaluronic acid. Hyaluronic acid is acidic in terms of pH value. , Sodium hyaluronate is an organic salt of weak acid and strong base, showing the opposite alkalinity. Both are involved in the ingredients of beauty cosmetics used by women. In terms of water absorption, softness and manufacturing cost, hyaluronic acid is better than sodium salt, and sodium hyaluronate is cheaper than hyaluronic acid. Please refer to it as appropriate.