Hyaluronic acid is a hydrating ingredient your skin already makes on its own. In skincare, it works as a humectant: it draws water into the upper layers of your skin and helps hold it there, so your complexion looks plumper, softer and more comfortable. It suits almost every skin type — including oily and blemish-prone skin — because it delivers water rather than oil. Here is how it actually works, what it can (and can't) do, and how to fit it into your routine.
What is hyaluronic acid?
Despite the name, hyaluronic acid isn't an exfoliating acid like salicylic or glycolic acid. It's a sugar molecule (a polysaccharide) that occurs naturally throughout the body — in your skin, joints and eyes. Its job is to hold on to water and keep tissues cushioned and lubricated.
In your skin specifically, hyaluronic acid sits between skin cells and acts like a sponge, holding moisture where it's needed. The often-quoted figure is that hyaluronic acid can hold up to 1,000 times its own weight in water — which is exactly why it has become one of the most popular hydrating ingredients in modern skincare. As we age, and with exposure to things like sun, central heating and harsh weather, the skin's natural stores of hyaluronic acid gradually decline, which is part of why skin can start to feel drier and look less bouncy over time.
The version used in skincare is typically made through fermentation rather than taken from animals, which is why a well-formulated hyaluronic acid product can be fully vegan. Every hyaluronic acid product in the Glimify range is vegan and cruelty-free.
How hyaluronic acid works on the skin
Hyaluronic acid is a humectant. Humectants attract water and bind it to the skin's surface layers, boosting hydration and helping skin feel supple. This is different from an occlusive (like a rich moisturiser or facial oil), which forms a seal on top of the skin to slow water loss.
That distinction matters in practice, because a humectant works best when there is water available for it to grab. Applied to slightly damp skin and then sealed with a moisturiser, hyaluronic acid can help your skin feel hydrated and plump. Applied to bone-dry skin in a very dry room with nothing layered over the top, it has less water to work with — which is the source of a common myth we'll come back to below.
Why "molecular weight" comes up so often
You'll often see serums described as containing "multi-weight" or "multiple molecular weights" of hyaluronic acid. Hyaluronic acid molecules come in different sizes. Larger molecules tend to stay nearer the surface, where they hold water and give an immediate smoothing, plumping look. Smaller molecules are able to travel a little further into the upper layers of the skin for hydration that feels deeper and longer-lasting. Formulas that combine several weights aim to hydrate more than one layer at once, which is why you'll see this called out on products like the Glimify Hyaluronic Acid Serum for Face, which uses multi-weight hyaluronic acid.
What hyaluronic acid does for your skin
Hyaluronic acid is a hydration workhorse rather than a do-everything active. Its cosmetic benefits include:
- Boosts hydration: draws water into the skin's surface layers so skin feels quenched and comfortable rather than tight.
- Plumps and smooths the look of skin: well-hydrated skin looks bouncier, and fine lines caused by dryness can appear softened.
- Supports a healthy-looking glow: hydrated skin reflects light more evenly, so your complexion can look fresher and more radiant.
- Lightweight and comfortable: because it delivers water, not oil, it layers easily under other products and doesn't feel heavy or greasy.
For more everyday ways to support a healthy-looking glow, see our top 10 skincare tips for glowing skin.
It's worth being realistic about what it can't do. Hyaluronic acid is a cosmetic hydrator; it isn't a treatment for medical skin conditions, and it won't permanently "fill" deep, structural wrinkles. The plumping effect is a hydration effect — genuinely lovely to see, but topped up by continued use rather than fixed forever.
Who should use hyaluronic acid?
One of the reasons hyaluronic acid is so widely recommended is that it suits almost everyone:
- Dry and dehydrated skin benefits from the obvious hydration boost.
- Oily and combination skin often loves it, because it hydrates without adding oil. Dehydration can actually make oily skin produce more shine, so a lightweight, water-based hydrator can be a smart choice. Look for a non-comedogenic formula, meaning it's designed not to clog pores — the Glimify Hyaluronic Acid Serum for Face is formulated to be non-comedogenic.
- Blemish-prone skin can usually use it comfortably, as it isn't an oil and isn't an active exfoliant.
- Sensitive skin tends to tolerate it well, though as with any new product it's sensible to patch test first.
How to use hyaluronic acid in your routine
Hyaluronic acid is easy to slot into a routine. As a general order of application, work from thinnest to thickest textures: cleanse, tone, apply your hyaluronic acid serum, then seal with a moisturiser. If you're still building your line-up, our beginner skincare routine guide walks through each step in order.
- Cleanse. Start with clean skin so your serum can absorb properly.
- Apply to slightly damp skin. After cleansing or toning, press a few drops of hyaluronic acid serum onto skin that is still a little damp. This gives the humectant water to bind to.
- Always seal it in. Follow with a moisturiser to lock in the hydration. This step is what stops a humectant from drawing moisture back out of the skin in very dry conditions.
- Use it morning and evening. Hyaluronic acid is gentle enough for twice-daily use and layers happily under sunscreen in the morning and richer creams at night.
It also plays well with other ingredients. You can layer it before or alongside actives like vitamin C, niacinamide and retinol — its hydrating, cushioning quality can make stronger actives feel more comfortable on the skin.
Common hyaluronic acid myths
Skincare is full of half-truths — we've tackled a few more in 5 skincare myths debunked. Here are the ones that come up most often with hyaluronic acid.
"It can dry your skin out." This only tends to happen if you apply it to dry skin in a very dry environment and don't seal it with a moisturiser. Apply to damp skin and layer a moisturiser on top, and this is a non-issue.
"More percentage is always better." Very high concentrations aren't automatically better and can feel tacky. A well-balanced formula matters more than chasing the biggest number.
"It's an exfoliating acid." As covered above, it isn't. It won't cause the tingling or sensitivity associated with AHAs and BHAs — it's a hydrator, full stop.
Glimify's hyaluronic acid range
If you'd like to add hyaluronic acid to your routine, Glimify has a few vegan, cruelty-free options designed in the UK:
- Hyaluronic Acid Serum for Face (30ml) — a lightweight, non-greasy serum using multi-weight hyaluronic acid to hydrate and visibly plump. Non-comedogenic and suitable for all skin types.
- DewySKIN Infusion Glow Serum (30ml) — a bestselling hydrating glow serum that quenches and brightens the look of dull, tired skin.
- DewySKIN Infusion Moisturiser (50ml) — with 5% hyaluronic acid to seal in hydration and keep skin feeling plump and soft. The perfect final step to lock your serum in.
Key takeaways
- Hyaluronic acid is a humectant that draws water into the skin's surface layers — not an exfoliating acid.
- It hydrates, softens the look of fine lines and supports a plumper, more radiant-looking complexion.
- It suits almost all skin types, including oily and blemish-prone, because it adds water rather than oil.
- Apply to slightly damp skin and always seal with a moisturiser to get the most from it.
- It layers well with actives like vitamin C and retinol, morning and night.
Frequently asked questions
Can you use hyaluronic acid every day?
Yes. It's gentle enough for twice-daily use, morning and evening, and layers well under sunscreen and other products.
Should you apply hyaluronic acid to wet or dry skin?
Slightly damp skin is ideal, as it gives the humectant water to bind to. Always follow with a moisturiser to lock the hydration in.
Is hyaluronic acid good for oily skin?
It can be a great choice. It hydrates without adding oil, and dehydrated skin can look shinier — so a lightweight, water-based hydrator suits many people with oily or combination skin. Choose a non-comedogenic formula.
Can hyaluronic acid replace my moisturiser?
Not really — the two do different jobs. Hyaluronic acid attracts water; a moisturiser helps seal it in. They work best used together.
Is Glimify's hyaluronic acid vegan?
Yes. Every hyaluronic acid product in the Glimify range is vegan and cruelty-free, and designed in the UK.
This article is for general information and isn't a substitute for personalised advice. If you have a specific skin concern or condition, consider speaking to a pharmacist or GP.
