Hyaluronic Acid

Hyaluronic acid can hold 1,000 times its weight in water, making it the planet’s most popular humectant—faster than the average moisturizer ingredient at delivering plumping hydration. Naturally present in skin, its levels decline by 20% per decade after age 40, but low-molecular-weight HA formulas penetrate deeper layers, boosting hydration by 48% within two hours. Injectable HA fillers alone represent a $4.5 billion medical aesthetics market annually.