1. The performance of moisturizing ingredients depends on the ability of specific groups (carboxyl, amino, hydroxyl, etc.) to bind with water. Polyaspartic acid contains both carboxyl and amino groups and has richer groups than other typical moisturizers.

2. Polyaspartic acid can form a flexible protective film on the skin surface, promote the accumulation of natural moisturizing agents in the skin, and lock in moisture and slowing down transepidermal water loss.

3. Polyaspartic acid inhibits hyaluronidase activity and maintains hyaluronic acid content in the skin; its protein-like structure gives it good skin-like properties, which gently softens the skin, enriches the skin's keratinocytes and helps restore skin elasticity.

4. Polyaspartic acid can bind with heavy metal cations, which can form stable metal complexes and block heavy metal ions from binding with human proteins and proteases, avoiding the damage of heavy metals to skin cells.