Hyaluronic acid is a humectant — a molecule that draws and holds water, many times its own weight. Your skin makes it naturally; it simply makes less over time, and loses it faster in dry air. Replacing it is the most reliable way to make skin look plumper, calmer and more luminous, quickly.
The detail most brands skip is duration. Hydration that flatters for the first hour and fades by lunch is a demonstration, not a moisturizer. That principle — moisture that is held through the day, not merely applied in the morning — is what La Crème was composed around.
One caveat worth knowing: in very dry air, a humectant can pull water from the skin if there is nothing to seal it. The fix is simple — apply to slightly damp skin, then lock it in with a moisturiser or a few drops of L'Élixir.
Hydration is unglamorous and it is everything. A well-watered complexion reflects light evenly — which is, in the end, all that glow has ever meant.
Hydration is not a luxury step. It is the one that makes every other step work.
