You just can’t avoid Hyaluronic Acid Serum at the moment. It’s the skincare buzzword du jour, the doyenne of dermatologists, the sweetheart of the skin scientists.

But what has led to its rise in popularity and why is Hyaluronic Acid everyone’s must-have anti-ageing skincare ingredient?

Well, one of the best things about Hyaluronic Acid Serum is the almost immediate effect it has on skin. From the first application, your skin feels softer and more hydrated.

Rather than being a damaging acid, which some people can wrongly assume, it’s something that we all naturally produce in our skin. Each molecule can hold up to 1,000 times its own weight in water. And because it’s already synthesised by our bodies, as well as being a moisture holding thing of wonder, it’s generally well tolerated by all skin types.

Molecular Weight Matters

You may hear people talking about ‘low molecular weight’ Hyaluronic Acid, like it’s the holy grail and anything else is a waste of time.

This is true, to a degree.

You see, low molecular weight Hyaluronic Acid Serum, like the one we use here at Mend, is able to penetrate deeper into the skin, moisturising and hydrating from within.

High molecular weight Hyaluronic Acid, on the other hand, only sits on top of the skin, since the molecules are too large to penetrate the deeper layers of the dermis. While on top of the skins’ surface, it can help to retain moisture, but only for a limited time before it evaporates.

The higher the molecular weight of Hyaluronic Acid, the greater the amount of salt, which can, in addition, dry out the skin rather than replenishing it.

But it’s not all bad. In fact, because it sits on the surface of the skin, higher molecular weight Hyaluronic Acid can act as a barrier to environmental stressors as well as an anti-inflammatory agent to the skin's upper layers.

Is Hyaluronic Acid a Moisturiser?

Technically, Hyaluronic Acid is a humectant, which means that the vast quantity of moisture it retains is infused into the skin.

In general, serums introduce active ingredients to the skin (to tackle concerns such as fine lines, hyperpigmentation or age spots), then moisturisers are used to seal in the goodness, whilst keeping pollutants out.

In the case of Hyaluronic Acid, however, moisture is added (smaller molecular weight Hyaluronic Acid) and retained (larger molecular weight Hyaluronic Acid), which is why this ingredient is so darn good.

Applying a moisturiser afterwards creates a nourishing ‘top coat’ to the upper layer of the skin, to help prevent the added moisture from evaporating and being lost.

The bottom line? Hyaluronic Acid is right up there in our 'go to' ingredients for super-smooth, younger looking skin. It is for this reason that it features in all products in the Mend collection.