Idrotherapy Hyaluronic Acid Serum contains three types of hyaluronic acid of differing molecular weights, distinguishing it from current hyaluronic serum products on the market. Combining three types of hyaluronic acid gives better results to the user than a single Hyaluronic Acid type. The ultra-low weight Hyaluronic Acid will be absorbed through the skin and moisturize from within. The ultra-high molecular weight will not absorb through the skin and will moisturize from without and the mid-weight Hyaluronic Acid will have features and benefits of the other two. The Ultra-High Molecular Weight Hyaluronic Acid(known under the tradename Hyacross) has undergone extensive clinical studies showing benefits for skin elasticity, skin smoothness, and skin hydration..