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Hyaluronic Acid as a Radical Scavenger

Hyaluronic acid is not only an important moisturizer for the skin, but it also fulfills another significant function: as a free radical scavenger, hyaluronic acid can help protect the skin from the harmful effects of free radicals.

Free radicals and reactive oxygen species (ROS) are produced both during normal metabolic processes and as a result of external factors such as UV radiation, environmental pollution, inflammation, or infections. Due to their high reactivity, they attack cell membranes, proteins, lipids, and even DNA. As a result, they accelerate skin aging and can lead to cell damage over the long term.

 

Free Radicals and Oxidative Stress

The human body has numerous protective mechanisms to neutralize free radicals. These include antioxidant enzymes as well as the body’s own protective substances such as glutathione, cysteine, uric acid, and vitamin E.

However, under severe stress—such as intense sun exposure or inflammatory processes—these natural defense systems can become overwhelmed. In such situations, support from antioxidant active ingredients becomes increasingly important.

Particularly problematic are:

  • Superoxide anions (O₂•⁻)
  • Hydrogen peroxide (H₂O₂)
  • Hydroxyl radicals (OH•)
  • singlet oxygen

Even small amounts of these compounds can cause significant damage to cellular structures.

 

Hyaluronic Acid as a Radical Scavenger in the Skin

Hyaluronic acid occurs naturally in the skin, where it performs numerous important functions. In addition to its ability to bind large amounts of water, hyaluronic acid acts as a radical scavenger and protects the skin from oxidative stress.

Upon contact with free radicals, the long molecular chain of hyaluronic acid is partially broken down. This binds the aggressive oxygen species and renders them harmless before they can attack important cellular components.

This mechanism makes hyaluronic acid a natural component of the skin’s antioxidant defense system.

 

How does hyaluronic acid protect against free radicals?

Scientific studies show that hyaluronic acid can act both directly as a free radical scavenger and indirectly by binding metal ions.

Iron and copper ions, in particular, promote the formation of highly reactive hydroxyl radicals via the so-called Fenton reaction. Hyaluronic acid can form complexes with these metal ions, thereby reducing the formation of aggressive radicals.

In addition, low-molecular-weight hyaluronic acid fragments also possess antioxidant properties. Due to their smaller size, they are particularly able to penetrate the upper layers of the skin.

 

Protection Against UV-Induced Lipid Peroxidation

An important mechanism of skin aging is what is known as lipid peroxidation. In this process, free radicals attack the lipids of the skin barrier and impair its protective function.

Scientific studies have investigated whether hyaluronic acid, as a free radical scavenger, can reduce UV-induced lipid peroxidation.

For this purpose, various skin lipid models were exposed to UVB radiation and subsequently treated with hyaluronic acid as well as different hyaluronic acid fragments.

The results showed:

  • Reduction in lipid peroxidation
  • Protection of skin lipids against oxidative damage
  • Comparable efficacy of high- and low-molecular-weight hyaluronic acid
  • Antioxidant effects even with hyaluronic acid fragments

These results confirm that hyaluronic acid can make an important contribution to protecting the skin barrier.

 

Hyaluronic Acid as a Transition Metal Ion Chelator

In addition to its function as a direct free radical scavenger, it is theorized that hyaluronic acid also acts as a so-called transition metal ion chelator.

Chelators bind metal ions such as iron or copper, thereby preventing the formation of additional free radicals. This mechanism could explain a significant portion of the antioxidant protective effect.

As a result, hyaluronic acid is now regarded not only as a moisturizer but also as a multifunctional anti-aging active ingredient.

 

Hyaluronic Acid as a Radical Scavenger in Cosmetics

Its antioxidant properties make hyaluronic acid a particularly interesting active ingredient for modern skincare products.

Among the most important benefits are:

  • Protection against oxidative stress
  • Support for the skin barrier
  • Prevention of light-induced skin aging
  • Reduction of UV-induced lipid damage
  • High skin tolerability
  • Additional intensive hydration

Both high-molecular-weight and low-molecular-weight hyaluronic acid can be effectively used in cosmetic formulations. Low-molecular-weight fragments, in particular, are characterized by good skin availability combined with comparable antioxidant efficacy.

 

Conclusion

As a free radical scavenger, hyaluronic acid offers the skin far more than just moisture. Studies show that it can neutralize free radicals, protect skin lipids, and reduce oxidative stress.

Thanks to its antioxidant properties, it helps prevent light-induced skin aging and supports the skin’s natural protective function. This makes hyaluronic acid one of the most versatile active ingredients in modern cosmetics.

 

Cosmacon is happy to support you in developing innovative skincare products with hyaluronic acid and other scientifically proven anti-aging active ingredients. Contact us!

 

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