Dr. Sturm’s proprietary concentration of low and high molecularly weighted Hyaluronic Acid is as high as it can optimally be before turning into a solid that could not be absorbed by the skin. Skincare products that claim to have high percentage concentrations with a number greater than 2.5% Hyaluronic Acid are in fact referring to a fractional Hyaluronic “complex” that is actually a much lower concentration of pure Hyaluronic Acid.