The Science Behind Hyaluronic Acid: How It Works and How to Use It Properly

Hyaluronic acid (HA) has become one of the hottest ingredients in skincare, loved for its incredible ability to hydrate and plump the skin. But what exactly is hyaluronic acid, how does it work, and how can you get the most out of it? Let’s take a closer look at the science and practical tips for using this skincare superstar.

What Is Hyaluronic Acid?

Hyaluronic acid is a naturally occurring sugar molecule found throughout the body, especially in connective tissues and the skin. Its main job is to hold onto water, providing moisture and volume.

One gram of HA can hold up to 6 litres of water, making it a champion hydrator.

How Does Hyaluronic Acid Work?

HA attracts and holds water molecules, acting like a sponge that pulls moisture from the environment (or from deeper skin layers) up to the skin’s surface. This hydration plumps your skin, smooths fine lines, and supports the skin barrier.

Molecular Size Matters

The size of HA molecules affects how they work:

High molecular weight HA stays on the skin’s surface, giving instant hydration and a smoothing effect.
Low molecular weight HA can penetrate deeper layers, helping with longer-term skin repair and reducing inflammation.

What Does Science Say About Hyaluronic Acid?

Hydration and Skin Elasticity
A study published in the Journal of Clinical and Aesthetic Dermatology showed that topical HA improved skin hydration and elasticity within just two weeks.
Wound Healing
HA also helps with wound healing by controlling inflammation and encouraging tissue repair, which is why it’s often used in medical skin treatments.
Anti-Ageing Benefits
Regular use of HA can reduce wrinkle depth and improve skin texture, according to several research studies.

How To Use Hyaluronic Acid in Your Skincare Routine

Step 1: Cleanse Your Skin

Start with a clean face so the HA can soak in properly.

Step 2: Apply HA Serum on Damp Skin

HA works best when applied to slightly damp skin — it pulls moisture from its surroundings. So after cleansing, spritz your face with water or a hydrating toner, then apply your HA serum.

Step 3: Lock It In With Moisturiser

Follow up with a moisturiser or oil to seal in the hydration. Without this step, HA might pull moisture from deeper layers, which can actually dry your skin out.

Step 4: Don’t Forget Sunscreen

Protect your hydrated skin with a broad-spectrum sunscreen every day.

Busting Some Myths

“More HA means better hydration.” Not always! Too much HA without sealing can cause dryness.
“HA replaces moisturiser.” Nope — HA hydrates but doesn’t lock moisture in. You still need a moisturiser.

Final Thoughts

Hyaluronic acid is a scientifically proven, versatile ingredient that gives your skin a hydration boost and anti-ageing perks. Use it properly and consistently, and you’ll notice healthier, plumper skin in no time.