The product name is derived from the wrinkle-filling method for facial skin (in English, "Filling"), which is achieved through the main active ingredient – specialized forms of HA (hyaluronic acids) that fill wrinkles caused by facial expressions and aging. Similar to cosmetic HA fillers, the primary function of Fillerina is to allow hyaluronic acid to penetrate the deeper layers of skin tissue and, by attracting water, fill the most visible, deeper, and faded areas of the skin (such as wrinkles and minor irregularities) while enhancing the volume of cheekbones and lips.