Hyaluronic Acid, Explained

You will find it in serums, creams and mists. Hyaluronic acid has become one of the most recognisable names in skincare, and for good reason: it is a reliable, well-understood hydrating ingredient.

What it is

Despite the word "acid", hyaluronic acid is not an exfoliant. It is a sugar-based molecule that occurs naturally in the body, including in the skin, where it helps hold on to water. In skincare it is often listed on ingredient labels as sodium hyaluronate or hyaluronic acid.

What it does

Hyaluronic acid is a humectant: an ingredient that attracts and binds water. Applied to the skin, it helps the surface hold on to moisture, which can leave skin feeling more hydrated and looking smoother and plumper. Like all hydration, the effect is temporary, which is why it works best as part of a daily routine.

A humectant draws in water. A moisturiser helps keep it there.

Why molecular weight matters

Hyaluronic acid comes in different molecule sizes. Larger molecules tend to stay on the surface of the skin, where they help form a light, hydrating film. Smaller molecules can reach further into the outer layers of the skin. Formulas that combine several sizes, often described as multi-molecular-weight, aim to hydrate at more than one level. Our Moisturising Day Cream is formulated with multi-molecular-weight hyaluronic acid.

How to use it

• Apply to clean skin. Hyaluronic acid serums are usually light and are best applied after cleansing.
• Seal it in. Follow with a moisturiser to help keep hydration in place, especially in dry or heated environments.
• Be consistent. Daily use matters more than a heavy application.

In our routine, the Hydrating Serum, enriched with jojoba oil and hyaluronic acid, comes after the Cleansing Foam, followed by the Moisturising Day Cream.

Who it suits

Hyaluronic acid is generally well tolerated and is found in products for many skin types. As with any new product, patch test first and stop if you notice irritation.

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This article is for general information and is not medical advice. Always patch test a new product and speak to a doctor or dermatologist about any skin or scalp concern.