If there is one ingredient that genuinely deserves its status as a skincare essential, it is hyaluronic acid. Not because it is trendy — it has been studied and used in dermatology and medicine for decades — but because it does something that very few ingredients can claim: it works with the skin's own biology rather than around it.
As a certified health coach and clean beauty expert, I am always cautious about calling any single ingredient a must-have. But hyaluronic acid is the closest thing to an exception. Here is why.
What is hyaluronic acid — and where does it come from?
Hyaluronic acid (HA) is a naturally occurring polysaccharide — a type of sugar molecule — found throughout the human body. It is present in the skin, the connective tissue, the eyes and the joints, where its primary role is to retain water and keep tissues lubricated, cushioned and functioning well.
In the skin specifically, hyaluronic acid is one of the primary components of the extracellular matrix — the structural framework that surrounds and supports skin cells. It works alongside collagen and elastin to maintain the skin's volume, firmness and moisture content.
The remarkable property that makes hyaluronic acid so extraordinary is its water-binding capacity. A single molecule of hyaluronic acid can hold up to 1000 times its own weight in water. This means that when the skin contains adequate levels of HA, it is continuously drawing moisture from its surrounding environment and holding it within the tissue — keeping cells plump, the surface smooth and the overall appearance dewy and youthful.
What happens to hyaluronic acid levels over time
Here is the important context that is often missing from the hyaluronic acid conversation: we are born with very high levels of hyaluronic acid in the skin. The characteristic plumpness and bounce of a baby's skin is in large part a reflection of its HA content.
From the age of approximately 25, the body's natural production of hyaluronic acid begins to decline — gradually but continuously. By the time we reach our 50s, the skin retains only around half the hyaluronic acid it had at 20. This decline accelerates with UV exposure, smoking, environmental pollution and — significantly — a diet high in sugar, which drives glycation and damages the structural proteins and molecules the skin depends on. (We explore the relationship between sugar and skin in our guide to sugar in skincare.)
This is why hyaluronic acid becomes increasingly important as a topical ingredient with age — and why understanding how to use it effectively matters so much.
The naturopathic perspective — hyaluronic acid from the inside out
Before we discuss topical application, it is worth understanding hyaluronic acid from a whole-body perspective — because this is where the naturopathic health coaching approach adds something that conventional skincare rarely addresses.
Dietary support for hyaluronic acid production
The body synthesises hyaluronic acid using building blocks obtained from the diet. Several nutrients are particularly important for supporting natural HA production:
Magnesium — plays a direct role in the enzymatic synthesis of hyaluronic acid in the body. It is also one of the most commonly deficient minerals in modern diets, which may be one reason why skin hydration deteriorates faster than it should in many people.
Zinc — supports the activity of hyaluronidase, the enzyme that regulates HA turnover in the skin. Adequate zinc is essential for maintaining optimal HA levels.
Vitamin C — not only essential for collagen synthesis but also plays a role in protecting hyaluronic acid molecules from oxidative degradation. A diet consistently rich in vitamin C — citrus fruits, bell peppers, kiwi, broccoli — supports HA longevity in the skin.
Bone broth and collagen-rich foods — contain the amino acids glycine and proline that support the connective tissue matrix in which hyaluronic acid functions. Traditional food wisdom about the skin-nourishing properties of slow-cooked stocks and broths has a sound naturopathic basis.
Soy isoflavones — research suggests that the oestrogen-like compounds in soy may support hyaluronic acid synthesis — which is one reason why HA levels in women's skin often decline more rapidly after menopause, when oestrogen falls. (We explore the connection between hormonal health and skin hydration in our guide to perimenopause and your skin.)
Antioxidant-rich foods — protect existing hyaluronic acid molecules from the free radical damage that accelerates their breakdown. Berries, leafy greens, green tea and colourful vegetables all contribute to HA preservation from within.
Hydration — this sounds obvious but bears stating clearly. Hyaluronic acid works by binding water. If your body is chronically under-hydrated internally, the efficacy of hyaluronic acid — both natural and applied topically — is significantly reduced. Adequate daily water intake is foundational.
Not all hyaluronic acid is created equal — what to look for
This is the most important practical consideration when choosing hyaluronic acid skincare products — and the one most often overlooked.
Natural vs synthetic hyaluronic acid
Hyaluronic acid used in skincare is produced through one of two methods: bacterial fermentation of plant-based substrates (the natural, clean beauty approach) or chemical synthesis from animal-derived materials — typically rooster combs.
Plant-fermented hyaluronic acid is the preferred choice from both a clean beauty and a performance perspective. It is bioidentical to the hyaluronic acid naturally found in human skin, is more stable in formulation and avoids the ethical and contamination concerns associated with animal-derived sources.
When reading labels, look for: sodium hyaluronate (the salt form of hyaluronic acid, which is more stable and penetrates the skin more effectively), hyaluronic acid, or hydrolysed hyaluronic acid — all of which can be plant-derived. The product's clean beauty credentials or certification will indicate whether the source is natural or synthetic.
Molecular weight — the most important technical consideration
This is where most consumers — and many skincare brands — oversimplify. The size of the hyaluronic acid molecule determines where in the skin it acts, and different molecular weights deliver different benefits.
High molecular weight HA (above 1,000 kDa) Larger molecules remain on the skin's surface where they form a hydrating film that locks in moisture, smooths the texture and improves the appearance of fine lines immediately. They do not penetrate deeply but their surface humectant effect is significant — particularly for dry and dehydrated skin that needs immediate comfort and protection.
Medium molecular weight HA (between 50 and 1,000 kDa) Penetrates into the upper layers of the epidermis, delivering hydration to the living cells beneath the surface layer. Provides both immediate and more sustained hydration effects.
Low molecular weight HA (below 50 kDa) Small enough to penetrate into the deeper layers of the dermis — the layer where collagen and elastin live. At this level, HA stimulates fibroblast activity, supporting collagen synthesis and providing the plumping, firmness-improving effects associated with longer-term use. This is the molecular weight most relevant for anti-ageing concerns.
The most effective hyaluronic acid formulations contain multiple molecular weights simultaneously — sometimes called multi-weight or layered HA. This approach delivers surface hydration, mid-level moisture and deep dermal support in a single application. When evaluating a serum or moisturiser, look for products that specifically reference multiple sizes or weights of hyaluronic acid.
How to use hyaluronic acid effectively
Application timing is critical — and widely misunderstood.
Hyaluronic acid is a humectant — meaning it draws moisture from its environment. Applied to completely dry skin in a low-humidity environment, it can actually draw moisture out of the deeper layers of the skin rather than from the air, temporarily worsening dehydration. This is a common reason people find HA disappoints them.
The correct technique:
Apply hyaluronic acid serum to slightly damp skin — immediately after cleansing, while the skin still has a light layer of water on its surface. The HA will bind to this water and draw it into the skin rather than competing with it. If your skin dries fully before application, mist your face lightly with water or a hydrating essence first.
Always follow with a moisturiser or oil to seal it in.
Hyaluronic acid retains moisture — it does not prevent its evaporation. Without an occlusive or emollient product applied on top to seal the moisture in, the water HA has drawn to the skin's surface will simply evaporate. Apply your moisturiser or facial oil immediately after the HA serum, while it is still slightly tacky.
Incorporating hyaluronic acid into your routine by skin type
Dry and dehydrated skin — use a concentrated HA serum morning and evening after cleansing, followed immediately by a nourishing moisturiser. Consider a hyaluronic acid-containing toner or essence as a first step after cleansing to begin the hydration layering process. In winter, this is non-negotiable.
Combination and oily skin — HA is one of the best-suited hydrating ingredients for oily skin because it is completely oil-free and non-comedogenic. Well-hydrated skin produces less compensatory sebum — meaning adequate HA use can actually reduce oiliness over time. Use a lightweight HA serum under a non-comedogenic moisturiser.
Sensitive and reactive skin — hyaluronic acid is exceptionally well tolerated, even by the most reactive skin types. It has no known irritant potential and is often the ingredient of choice for skin that cannot tolerate most actives. Choose fragrance-free formulations with minimal additional ingredients.
Mature skin — multi-weight HA formulations are particularly valuable, delivering both the immediate plumping effect at the surface and the deeper collagen-stimulating support at the dermal level. Used consistently over months, high-quality HA significantly reduces the appearance of fine lines and restores the skin's characteristic bounce and density.
All skin types in winter — hyaluronic acid becomes more important as the temperature drops and both outdoor and indoor air becomes drier. Consider increasing application frequency or upgrading to a more concentrated formulation during the coldest months.
Hyaluronic acid and the skin barrier
One final point that is often overlooked: hyaluronic acid plays a direct role in maintaining the skin barrier — not just in hydrating the skin above it.
The skin barrier's integrity depends on adequate moisture within the skin. When the skin becomes dehydrated, the barrier becomes compromised — more permeable to irritants, more reactive and less able to regulate moisture loss. This is the cycle of dehydration that leads to sensitisation, redness and accelerated ageing.
By maintaining optimal skin hydration, hyaluronic acid supports the barrier's structural integrity — making it a foundational ingredient not just for hydration but for overall skin health and resilience.
This is the naturopathic principle of working with the skin's own biology, rather than imposing temporary solutions from the outside. Hyaluronic acid does not trick the skin into appearing more hydrated. It gives it the molecule it naturally contains and naturally needs — replenishing from without what time and environment have reduced from within.
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