Key to Ultimate H.A.'s® effectiveness is Hyaluronic Acid, derived from patented and clinically studied BioCell Collagen®. Hyaluronic Acid (H.A.) — "The Molecule of Youth™" — is an essential structural compound found in our skin and joints. With its unique ability to hold up to 100X its weight in water, H.A. is critical for skin hydration and elasticity as well as promoting normal, healthy joint comfort and mobility.