Hyaluronic Acid vs Glycerin vs Squalane: Which Is Best for Dry Skin in Canadian Fall?

Every fall, the same thing happens in skincare aisles across Canada: the humidity drops, the furnace kicks on, and suddenly a moisturizer that worked fine all summer isn't cutting it anymore. The instinct is usually to go looking for the "best" hydrating ingredient — and hyaluronic acid, glycerin, and squalane are the three names that show up over and over, often pitted against each other in product marketing as if one has to win.

The honest answer, based on the clinical research on these three ingredients, is that they're not really competing with each other. They do different jobs. Glycerin and hyaluronic acid pull water into the skin; squalane smooths and seals the surface. Treating them as rivals — or assuming any one of them alone can fully solve fall dryness — tends to set people up to be disappointed with all three.

This article works through what the evidence actually shows for hyaluronic acid, glycerin, and squalane individually, where the research disagrees or is thinner than marketing suggests, and how to actually combine them for dry skin as Canadian fall weather turns.

What Are Hyaluronic Acid, Glycerin, and Squalane?

All three are common moisturizing ingredients, but they belong to different functional categories, and that's the most useful thing to understand before comparing them.

Glycerin is a small, simple humectant molecule — meaning it attracts and holds onto water. It's one of the most extensively studied ingredients in skincare and shows up in products ranging from drugstore lotions to prescription-strength barrier creams.

Hyaluronic acid (HA) is a naturally occurring sugar molecule already present in your skin, where it helps hold water in place. Topical HA is also a humectant, but unlike glycerin, it comes in a range of molecular weights — low, high, and cross-linked (chemically bonded into a denser network) — and those variants behave differently on the skin, which is a detail worth understanding before buying a serum.

Squalane is the stable, shelf-friendly form of squalene, a lipid the skin produces naturally (skincare squalane today is most often derived from olives or sugarcane rather than animal sources). Functionally, it's an emollient — it fills in the microscopic gaps between skin cells to smooth texture, rather than pulling in water the way glycerin and HA do.

How Do They Actually Work?

Dermatology generally sorts moisturizing ingredients into three functional categories, and it's worth knowing all three even though this article focuses on the last two:

• Humectants (glycerin, hyaluronic acid, urea) draw water into the outermost skin layer, the stratum corneum, from both the deeper skin layers and the surrounding air.

• Emollients (squalane, plant oils) settle into the spaces between skin cells, smoothing rough texture and improving how skin feels without necessarily blocking water loss.

• Occlusives (petrolatum, silicones, paraffin) form a physical film on the skin's surface that blocks water evaporation directly — this is the category with the largest, most reliably measured effect on transepidermal water loss (TEWL), with petrolatum shown to reduce it by roughly a third within a few hours of application.

None of the three ingredients in this comparison is a true occlusive. That single fact turns out to matter more than any individual ingredient's marketing claims, because a humectant that pulls water into the skin without something to help seal it in can, in low-humidity conditions, end up losing that water to the air just as fast as it drew it in — which is part of why fall and winter routines usually need more than a humectant serum alone.

What Does the Clinical Evidence Actually Show?

Hydration: Glycerin Has the Strongest, Most Consistent Trial Support

Of the three, glycerin has the deepest bench of randomized, vehicle-controlled trials behind it. A Cochrane systematic review of moisturizers for eczema found glycerol-containing formulas significantly outperformed plain vehicle for skin hydration, and several controlled trials in both eczema and general dry skin (xerosis) have confirmed meaningful increases in stratum corneum hydration, measured by skin capacitance, compared with vehicle alone. This is the strongest evidence tier among the three ingredients for straightforward hydration.

Hyaluronic acid's hydration evidence is real but more complicated. A double-blind randomized trial in elderly patients with xerosis found that lower-molecular-weight HA modestly outperformed higher-molecular-weight HA on skin capacitance, while a separate study using a hydrogel-based HA cream reported improved hydration and lipid content by eight weeks. But because HA products vary so much by molecular weight and formulation, results don't generalize cleanly from one HA product to another the way they tend to with glycerin.

Squalane's hydration evidence is the thinnest of the three. It's well documented mechanistically as an emollient with antioxidant properties, but there's limited direct clinical-trial data isolating its independent effect on skin hydration — most of what exists studies it as one ingredient within a multi-ingredient moisturizer, which makes it hard to credit squalane alone for the results.

Barrier Sealing (TEWL): This Is Where the Real Disagreement Is

This is the area where the underlying research genuinely conflicts, and it's worth naming that plainly rather than smoothing it over. On plain, non-crosslinked hyaluronic acid, several trials — including a randomized comparison in elderly patients with xerosis — found that HA alone did not meaningfully reduce transepidermal water loss compared with a basic vehicle, even though it improved hydration readings. One laboratory explant-tissue study went further, finding that low-molecular-weight HA alone actually increased water loss compared with control, behaving as a pure humectant without any barrier-sealing benefit. Meanwhile, a specially engineered, crosslinked form of HA tested in that same lab model showed a meaningfully different profile — reducing water loss and increasing epidermal water content in a way that looked more like a combined humectant-and-occlusive effect.

The conservative read here: this crosslinked, engineered HA is a distinct, specialized ingredient, tested so far mainly in a pilot laboratory (explant) model rather than confirmed in larger human trials — so it shouldn't be assumed to represent what a typical "hyaluronic acid" listed on a drugstore serum label will do. For standard HA serums, the more consistent finding across the available human trials is that HA reliably improves hydration readings but doesn't reliably reduce water loss on its own.

Glycerin's picture is more reassuring but comes with the same caveat about needing a partner ingredient. Some trials do show glycerin alone modestly improving TEWL compared with vehicle, but the more consistent and more clinically meaningful finding is that glycerin paired with an occlusive like petrolatum significantly outperforms glycerin used by itself for reducing water loss. In other words, glycerin's barrier benefit is real, but it's substantially strengthened by combining it with something that seals the surface — it's not typically a stand-alone barrier fix.

Smoothness and Texture: Squalane's Actual Strength

Where squalane has more consistent support is texture and surface smoothness — filling in gaps between corneocytes (skin cells), reducing roughness, and improving how skin feels to the touch, alongside modest antioxidant properties that may help protect surface lipids from oxidative stress. This is arguably squalane's clearest, best-supported role: not as a hydration powerhouse, but as the ingredient that makes a routine feel less tight, flaky, and rough once hydration is already being addressed by a humectant.

Combining Ingredients Beats Picking a Favourite

Across the available research, one point comes up consistently: humectants used without an emollient or occlusive to help seal them in can end up pulling water from deeper skin layers only to lose it to a dry environment — and formulations that combine a humectant with an emollient or occlusive tend to outperform any single ingredient used alone. It's also worth being direct about a real limitation in this evidence base: true head-to-head trials directly comparing pure hyaluronic acid against pure glycerin against pure squalane in the same protocol are essentially absent from the literature. Most real-world evidence comes from multi-ingredient formulations or from comparing one ingredient to a vehicle — not from clean, isolated horse races between the three. That means confident claims that one of these three ingredients is simply "the best" aren't well supported by the trial evidence that actually exists.

Why This Matters More in Canadian Fall

No study has directly tested these three ingredients specifically in Canadian fall or winter conditions. But the underlying physiology is well established: cold air holds less moisture, and indoor heating strips additional humidity from the air, both of which are recognized environmental triggers for xerosis (dry, rough skin). In that kind of low-humidity environment, a humectant has less ambient moisture available to draw from, and any water it does pull toward the skin's surface is lost to evaporation more readily unless something helps hold it there. This is a physiological rationale rather than a Canadian-specific clinical trial finding, but it lines up with the broader evidence above: as fall humidity drops, pairing a humectant with an emollient or occlusive becomes more important, not less.

Concentration, Formulation, and What to Look For on a Label

Glycerin shows a genuine concentration-dependent effect in lab studies — its moisture-retention capacity increases with concentration, and in controlled evaporation studies very high concentrations (in the 60–70% range) essentially stop losing moisture to the air and start pulling it in instead. That's a real physical property, but it describes glycerin in near-pure solution under lab conditions — not a typical finished moisturizer, where glycerin is usually one ingredient among many at a much lower percentage. A high position on the ingredient list is a reasonable signal, but the finished formulation and how it's paired with other ingredients matter more than chasing a specific number.

Hyaluronic acid labels rarely disclose molecular weight, which is the detail that actually predicts behaviour based on the research above. "Hyaluronic acid" or "sodium hyaluronate" alone doesn't tell you whether a product uses low-molecular-weight, high-molecular-weight, or crosslinked HA — and, as covered above, that distinction affects both hydration and barrier performance. Multi-molecular-weight HA serums (blending several weights) are increasingly common and are a reasonable way to hedge across this uncertainty, though they haven't been tested as a category against single-weight HA in the trials reviewed here.

Squalane is generally well tolerated at a range of concentrations and doesn't have the same dose-response literature as glycerin — more isn't clearly established as better. It's typically found in facial oils and richer moisturizers rather than lightweight serums, reflecting its role as an emollient rather than a humectant.

Across all three, the practical label lesson is the same one from the article on early skin aging: a single percentage or ingredient name on the front of a bottle tells you less than how it's formulated and what it's paired with.

How to Build a Fall Routine Around These Ingredients

The order of application matters as much as the ingredients themselves. A useful, mechanism-consistent approach is to apply a humectant — glycerin, HA, or both — to slightly damp skin, then follow within a minute or two with a moisturizer containing emollients and/or occlusive ingredients to help seal that moisture in. Applying a humectant serum and walking away without a follow-up moisturizer, particularly in a dry, heated room, risks losing some of the water it just pulled toward the skin's surface.

As Canadian fall humidity drops and furnaces switch on, this is a reasonable point to size up from a lightweight summer lotion to a richer moisturizer with more emollient or occlusive content, particularly at night when a heavier layer isn't a cosmetic concern. Squalane-based facial oils are commonly layered as the last step for this reason, sitting on top of a humectant serum to help slow surface water loss overnight.

Introducing any new active ingredient — retinoids especially — alongside this transition is worth doing gradually, since a compromised, dry barrier tends to make skin more reactive to actives than usual.

Common Mistakes and Myths Worth Avoiding

Using a hydrating serum alone and expecting it to be a complete moisturizer. A humectant without an emollient or occlusive on top can leave skin more exposed to evaporation in dry indoor air, not less.

Assuming all "hyaluronic acid" products behave the same way. Molecular weight isn't usually listed on the label, and the research shows real behavioural differences between low-molecular-weight, high-molecular-weight, and crosslinked forms — particularly for barrier sealing.

Believing marketing claims that one of these three ingredients is definitively "the best." True head-to-head trials comparing pure glycerin, pure hyaluronic acid, and pure squalane against each other are essentially nonexistent; most "winner" claims aren't backed by that kind of direct comparison.

Chasing a high glycerin percentage on a label. The lab finding that very high glycerin concentrations stop losing water to the air describes near-pure solutions, not a realistic guide for shopping a finished product.

Skipping moisturizer in fall because skin "isn't that dry yet." Xerosis driven by falling humidity and indoor heating tends to build gradually — starting a slightly richer routine before skin feels uncomfortably tight is easier than trying to repair a barrier that's already compromised.

When to See a Doctor

Ordinary seasonal dryness usually responds to a more consistent humectant-plus-moisturizer routine within a couple of weeks. It's worth seeing a doctor instead of adjusting products further if dryness is accompanied by significant cracking, bleeding, or pain; spreading redness, warmth, or pus suggesting a skin infection; itching severe enough to disrupt sleep; or a rash pattern that looks like eczema and isn't improving with basic moisturizing. Sudden, severe dryness that's out of proportion to the season can occasionally point to an underlying condition — such as a thyroid problem or an undiagnosed skin condition — that's worth ruling out rather than treating with skincare alone.

A Doctor's Take

Patients often want me to just name the single best ingredient, and the research doesn't really support giving that answer. Glycerin has the strongest and most consistent trial evidence of the three for hydration, and pairing it with an occlusive is the best-supported way to also reduce water loss. Squalane's real strength is smoothing texture, not hydrating on its own. Hyaluronic acid is the most misunderstood of the three — genuinely effective for hydration, but its barrier-sealing behaviour depends heavily on molecular weight and formulation in ways most labels don't disclose, and the strongest "HA seals the barrier" data so far comes from a specialized, engineered form tested mainly in lab models rather than large human trials. My practical advice is to stop looking for one ingredient to do everything and instead build a routine that layers a humectant with something to seal it in — that combination has better evidence behind it than any single ingredient does on its own, especially once fall humidity drops and the furnace comes on.

The Bottom Line

None of hyaluronic acid, glycerin, or squalane is clearly "best" in isolation, because they aren't solving the same problem: glycerin has the strongest evidence for pulling water into the skin, squalane has the more consistent evidence for smoothing texture and surface feel, and hyaluronic acid sits in between with real but formulation-dependent results, particularly around molecular weight. The evidence most relevant to Canadian fall is less about which single ingredient to pick and more about combining a humectant with an emollient or occlusive moisturizer, since low humidity and indoor heating make it easier for a humectant to lose the water it draws in if nothing helps seal it there. For most people with ordinary seasonal dryness, that layered approach — rather than a single "hero ingredient" — is what the research actually supports.

MiraGlow Products to Consider

The products below fit specific steps of the layered routine discussed above; they're general options to consider rather than products clinically proven to outperform the ingredients they contain. Formulations, availability, and pricing can change, so it's worth checking MiraGlow's skincare collection directly before purchasing.

• Hydration Serum — A humectant-focused step that fits the "damp skin" application approach discussed above; best followed promptly by a moisturizer rather than used alone in dry fall air.

• Gentle Face Cleanser with Hyaluronic Acid — A barrier-friendly cleanser that avoids stripping skin further before a hydrating routine, which matters more once the weather turns and skin is already losing moisture faster.

• Lightweight Daily Moisturizer — A follow-up step to seal in a humectant serum; layering it after a hydrating serum, rather than swapping one for the other, lines up with the combination evidence discussed above.

Related Reading

MiraGlow's blog covers related seasonal skincare topics, including barrier repair and Canadian winter routines, that build on the hydration-versus-sealing distinction discussed here — worth a browse for readers building out a full fall or winter routine.

References

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