Serum contains mix of low, medium and high molecular weight hyaluronic acid. High molecular hyaluronic acid actually sinks below the skin’s surface where it is most effective, restoring water loss, plumping up lines and restoring firmness and elasticity to the skin, while the low molecular weight hyaluronic acid nourishes, brightens and tones the surface of the skin. Mid-Molecular-Weight Hyaluronic Acid offers short-term comfort and hydration in the middle depths of the skin. Amino acids help in the production of collagen and elastin, regulate sebaceous gland activity and decrease discoloration.