During the development of their lotions and serums, the client discovered that the products did not provide sufficient moisturizing after use, especially in dry seasons or air-conditioned environments. Skin tended to feel tight, and fine lines appeared after prolonged use, negatively impacting the user experience. The client wanted to improve the products' long-lasting moisturizing ability while maintaining a lightweight, non-greasy texture to meet the demands of the high-end skincare market.

It was recommended to add high-purity cosmetic-grade hyaluronic acid to the lotion and serum formulas. Long-chain hyaluronic acid forms a moisturizing film on the skin's surface, while short-chain hyaluronic acid penetrates deep into the stratum corneum to hydrate, achieving dual moisturizing both surface and internally. Simultaneously, dispersion optimization was provided for the lotions and serums to ensure even distribution of hyaluronic acid without affecting the product's shine and smoothness. Experimental verification showed that this combination significantly improves the product's moisture retention capacity and skin feel.

The optimized products apply smoothly, absorb quickly, and leave skin soft, plump, and with reduced fine lines. Skin hydration is noticeably improved. The customer stated that the product significantly improved the user experience, enhanced market competitiveness, and resulted in a high repurchase rate. The R&D team also highly praised the effectiveness of hyaluronic acid in different molecular weight combinations.