Hyaluronic Acid Cross-linked Esthetic Products Series For correction of lines, augmentation of folds and the shaping of facial contours biosynthetically produced by bacterial fermentation. After cross-linking, the characteristics of hyaluronic acid products are stable.Non-animal, no skin test needed. After injection, the products are absorbed isovolemically, this implantation volume can be maintained for 6 to 12 months.