Squalane and hyaluronic acid are two of the most recommended ingredients in skincare, and they’re often compared as if choosing between them is necessary. It isn’t. They work through completely different mechanisms and address different aspects of skin hydration. Understanding what each does changes the comparison from “which is better” to “what does my skin need and when.”
Hyaluronic acid: the water magnet
Hyaluronic acid (HA) is a glycosaminoglycan, a polysaccharide molecule that occurs naturally throughout the body in connective tissue, synovial fluid, and the extracellular matrix of the skin. In the dermis, it plays a crucial role in maintaining hydration and structural support, holding up to 1,000 times its weight in water.
HA is a humectant, meaning it attracts and binds water molecules to itself. Applied topically, it draws moisture from two sources: the deeper layers of the skin and the ambient environment. This is why the humidity of your environment affects how well topical HA works. In a dry climate or dry room, HA can actually draw moisture from the deeper dermis to the surface and allow it to evaporate, potentially increasing skin dryness rather than reducing it. This is a well-documented issue with high concentrations of HA in low-humidity environments.
The molecular weight of HA significantly affects what it does on skin. High-molecular-weight HA (over 1 million daltons) cannot penetrate the skin barrier; it sits on the surface and forms a hydrating film that reduces transepidermal water loss and creates a plumping effect. Low-molecular-weight HA (under 50,000 daltons) can penetrate into the epidermis to some degree and provides deeper hydration. Some products use a combination of both for surface and deeper effects.
HA degrades quickly after application and needs reapplication. Its effects are also temporary in the sense that the hydration it provides persists only while the ingredient is present and the moisture is retained.
Squalane: the lipid barrier supporter
Squalane is a saturated hydrocarbon derived from squalene, a compound that occurs naturally in human sebum (comprising about 10-15% of it) and in various plant sources. In cosmetics, plant-derived squalane comes primarily from sugarcane (most common now) or olive oil, producing an identical compound to the shark-liver squalane that was historically used before sustainable alternatives developed.
Squalane is an emollient and occlusive rather than a humectant. It doesn’t attract water; it prevents water from leaving. Applied topically, squalane integrates into the surface lipid layer and mimics the skin’s own sebum, reducing transepidermal water loss without feeling heavy or greasy. Because it’s structurally similar to skin’s own sebum components, it’s exceptionally well-tolerated across all skin types, including oily and acne-prone skin, which is unusual for a facial oil.
Squalane is also highly stable compared to most plant oils, it has a long shelf life and doesn’t go rancid easily. This makes it a reliable ingredient to incorporate without worrying about whether it’s still active.
Why they work together
The combination of a humectant and an emollient/occlusive is more effective than either alone for hydrating skin. This is the principle behind many well-formulated moisturisers.
HA draws water to the skin surface (the hydration step). Squalane then reduces the evaporation of that water (the sealing step). Without the sealant, the water HA has attracted can evaporate, particularly in dry climates. Without the humectant, there’s less moisture for the sealant to protect.
In practical routine terms: apply HA serum to damp skin (so there’s moisture for it to bind), then follow with squalane or a moisturiser containing squalane to seal it in. This sequence maximises the effect of both ingredients.
Which one to prioritise for specific concerns
If your skin is primarily dehydrated (lacking water), lacking elasticity, and showing fine lines that look worse in dry weather, HA is the more directly relevant ingredient. The surface plumping and water-binding effects are what you need.
If your skin is dry (lacking oil), flaky, and has a compromised barrier, squalane is more relevant. The lipid barrier support is what’s missing, and adding water without supporting the barrier means that water will just evaporate.
Most people with dry, dehydrated, or mature skin benefit from both. The combination addresses both the water component and the lipid component of healthy skin hydration.
Oily skin types can use both but in different proportions: a very light HA serum for hydration and a drop of squalane as the final step, rather than a heavy occlusive layer. Squalane’s non-comedogenic profile makes it appropriate even for people who normally avoid oils.
Concentration and formulation quality
HA works best at 0.1-2% concentration in a formulation. Higher concentrations don’t necessarily produce better results and can increase the risk of the drawing-moisture-upward problem in dry conditions. Products that list HA high in the ingredient list and use a combination of molecular weights provide the most well-rounded effect.
Squalane is a relatively stable, single-ingredient option that doesn’t have the same concentration-sensitive nuances as HA. A pure squalane oil applied after a hydrating serum is a simple and effective approach. It can also be incorporated into moisturisers and serums as one ingredient among several.
Both ingredients are now well-priced and widely available. The days when hyaluronic acid serums were specialty items from single high-end brands are over. The priority now is formulation quality, ensuring the HA is actually at a useful concentration, and the squalane is plant-derived and in a format that suits your skin type.