Hyaluronic Acid, Explained

Hyaluronic acid isn't an exotic lab invention — it's a sugar molecule (a glycosaminoglycan) your body already makes and uses throughout your skin, joints, and eyes to keep tissue cushioned and hydrated. What makes it useful in skincare is a simple physical property: a single hyaluronic acid molecule can bind and hold up to roughly a thousand times its own weight in water, which is what makes it one of the most effective humectants available — it doesn't add oil or occlude skin, it pulls water in and holds it there.

The detail most routines get wrong is molecular weight. High-molecular-weight hyaluronic acid is too large to pass through the outer skin layer, so it sits on the surface and forms a breathable film that slows moisture loss — useful, but it isn't reaching living skin cells. Lower-molecular-weight, hydrolysed forms are small enough to actually penetrate into the epidermis, where they can support hydration at a deeper level. Well-formulated products often blend a few molecular weights for exactly this reason — surface hydration and deeper delivery at once.

Skin's own hyaluronic acid content also declines with age, alongside collagen and elastin — one of the reasons mature skin loses that springy, plump quality even before fine lines show up. It's part of why hydration-focused treatments matter as much as anti-ageing ones: our Oxygen Treatment is built around intense hydration for exactly this kind of moisture-depleted skin, and IONTO Stem Cell Treatment uses iontophoresis to drive hydrating actives past the surface rather than leaving it to a topical alone.

One genuine caution: in very dry, low-humidity air, a hyaluronic acid serum applied without anything to seal it in can occasionally pull moisture from deeper skin layers toward the surface, where it evaporates — the opposite of the intended effect. Layering it under a moisturiser avoids this, which is part of why product order matters more than most people assume.

Like most actives, how much of this actually shows up on your skin depends on formulation, concentration, and what else is in your routine — which is exactly what a proper Skin Analysis is for before you commit to a product or a course of treatments.