In the ever-evolving world of skincare, few ingredients have achieved cult status quite like hyaluronic acid. Loved by dermatologists, beauty editors, and TikTokers alike, it’s found in everything from serums and sheet masks to cleansers and moisturisers. But what makes this ingredient so essential?
Hyaluronic acid is famed for its ability to deeply hydrate the skin, plump fine lines, and boost radiance — all without clogging pores or causing irritation. As we age, the skin’s natural supply of hyaluronic acid diminishes, which is why topping it up topically can make such a visible difference. Let’s break down what it is, how it works, and the best products to try right now.
What Is Hyaluronic Acid?
Hyaluronic acid (HA) is a naturally occurring sugar molecule found in the skin, eyes, and connective tissues of the body. Its main function is to retain moisture — and it's extremely good at it. In fact, it can hold up to 1,000 times its weight in water, making it one of the most effective hydrators in skincare.
In the skin, HA helps maintain elasticity, smoothness, and a youthful appearance. However, our body’s natural levels decline over time due to ageing and environmental damage, which is why skin can start to appear dull, dehydrated, and more prone to fine lines. Applying it topically gives the skin a boost, helping it appear fresher and more supple.
The Benefits of Hyaluronic Acid for Your Skin
Hydration Boost: The primary benefit of hyaluronic acid is its unmatched hydrating power. It acts like a sponge, pulling moisture from the air into your skin and locking it in. Well-hydrated skin looks brighter, feels smoother, and is more resilient against environmental aggressors.
Plumps & Softens Fine Lines: Dehydration can make fine lines and wrinkles more prominent. Hyaluronic acid plumps the skin by increasing its water content, which softens the appearance of these lines almost instantly. Over time, consistent use can also improve elasticity and firmness.
Soothing & Gentle: Another standout feature of hyaluronic acid is that it suits all skin types — even sensitive and acne-prone skin. It helps calm irritation and support the skin barrier, especially when paired with other ingredients like ceramides or vitamin B5.
Types of Hyaluronic Acid & How They Work
Not all HA is created equally. Different molecular weights penetrate the skin at different levels*:
- High molecular weight HA sits on the surface and creates a protective, hydrating barrier.
- Low molecular weight HA penetrates deeper, delivering moisture below the skin’s surface and helping improve long-term hydration and elasticity.
*This is why a multi-molecular weight HA is my go-to choice!
Who should use it?
- Oily or acne-prone skin: Use a lightweight HA serum that hydrates without adding oil.
- Dry or mature skin: Opt for richer formulations or products that combine HA with ceramides or squalane.
- Sensitive skin: HA is non-irritating and soothing, so it’s ideal for those prone to redness or inflammation.
How to Use Hyaluronic Acid in Your Skincare Routine
To get the most from hyaluronic acid, apply it in the right way:
- Step 1: Cleanse your skin to remove dirt and oils.
- Step 2: Apply hyaluronic acid to damp skin. This is crucial — applying it to dry skin may actually pull moisture from within your skin if there’s not enough ambient humidity.
- Step 3: Seal it in with a good moisturiser to lock in hydration.
You can use it morning and night, and it pairs well with other ingredients like niacinamide, vitamin C, peptides, and SPF. It’s safe to use daily and plays well with almost every other product in your routine.
The Best Hyaluronic Acid Products to Try
🧴 Medik8 Hydr8 B5 Liquid Rehydration Serum
A dermatologist-loved formula, this lightweight serum combines multi-molecular-weight hyaluronic acid with vitamin B5 to deeply hydrate and repair the skin. It penetrates at different levels, providing both immediate and long-lasting moisture. It’s ideal for all skin types and absorbs quickly without stickiness — perfect for layering under makeup or night cream.
This Medik8 serum makes skin feel instantly refreshed and plump, and the clinical-grade formula makes it a trusted choice for visible results.
Where to buy: LookFantastic, Cult Beauty, SpaceNK, SephoraUK, Medik8, John Lewis
💧 CeraVe Hydrating Hyaluronic Acid Serum
Loved for its gentle and effective formula, this serum includes hyaluronic acid, ceramides, and vitamin B5 to hydrate and support the skin barrier. The gel-cream texture is fast-absorbing and suitable for dry or sensitive skin.
This Cerave serum was developed with dermatologists, it’s fragrance-free, non-comedogenic, and packed with skin-loving ingredients for all-day hydration.
Where to buy: Boots, LookFantastic, Cult Beauty, SephoraUK, BEAUTYBAY
🧪 The Ordinary Hyaluronic Acid 2% + B5
This cult-favourite serum offers incredible value and delivers multi-depth hydration. It contains three forms of HA at different molecular weights, as well as vitamin B5 for added skin support.
It’s budget-friendly, highly effective, and loved by skincare newbies and pros alike. Plus, it’s vegan and cruelty-free.
Where to buy: Cult Beauty, LookFantastic, SephoraUK, Selfridges, SpaceNK, Boots, John Lewis, BEAUTYBAY, The Ordinary
💦 Vichy Minéral 89 Hyaluronic Acid Serum
Combining 89% Vichy Volcanic Water with hyaluronic acid, this iconic serum strengthens the skin barrier while hydrating. Its lightweight, gel-like consistency absorbs in seconds, making it perfect for daily use under moisturiser or SPF.
This Vichy serum is ideal for sensitive skin and praised for giving a fresh, dewy glow — it's no wonder this serum is a French pharmacy favourite.
Where to buy: Boots, LookFantastic, SephoraUK
Things to Watch Out For
While hyaluronic acid is incredibly well-tolerated, it’s important to use it correctly:
- Apply to damp skin, not dry, to prevent it from pulling moisture out of your skin.
- Seal it in with a moisturiser, especially in dry or cold climates.
- Patch test any new product — although rare, some people may experience sensitivity or a breakout when introducing a new active ingredient.
Also, if your skin still feels dry after using HA, you may need to increase the humidity in your environment (a humidifier can help) or layer it with more emollient products like oils or occlusive creams.
Hyaluronic acid is a hero ingredient for good reason — it hydrates, plumps, soothes, and enhances the skin’s natural glow. Whether you’re dealing with dryness, dullness, or fine lines, incorporating a well-formulated hyaluronic acid product into your skincare routine can make a visible difference.