The Power of Sterols for Skin Barrier Repair

At O&3, we are constantly seeking and innovating to discover the perfect ingredients for maintaining and enhancing skin health, bringing you the best natural ingredients for your formulations.

The skin serves as the body’s first line of defence against external factors, such as pollutants, UV radiation, and pathogens and the outer layer, known as the stratum corneum, plays a pivotal role in maintaining this barrier function. However, various factors such as harsh weather, over exfoliation, and excessive cleansing can compromise its integrity, leading to dryness, sensitivity, premature ageing, and inflammation.

But this isn’t just a fad, it is a data-driven movement, with the global skin barrier repair market growing at a CAGR of 3.8% and expected to reach $540.9 million by 2034 from $373.4 million in 2024, according to Fact.MR. Consumers, armed with information and fuelled by the rise of beauty influencers, are demanding more than just quick fixes.

Sterols are gaining significant attention and popularity, due to their remarkable ability to repair and fortify the skin barrier. So, join us today as we explore the science behind sterols, their benefits for skin, the various types, and the natural oils rich in them.

What are plant sterols and are they safe?

Plant sterols, or phytosterols, are naturally occurring compounds found in plant cell membranes that resemble cholesterol in structure. These compounds have been extensively studied for their health benefits, particularly in lowering cholesterol levels and supporting heart health.

In skincare, plant sterols work by integrating into the skin barrier, mimicking and enhancing the function of natural lipids which helps to reinforce the barrier, retain moisture, and protect against environmental aggressors. The safety of plant sterols is also well-documented, with numerous studies supporting their non-toxic, non-irritating nature when used in topical applications. Their anti-inflammatory and skin-soothing properties make them suitable for all skin types, including sensitive and reactive skin.

Benefits of incorporating sterols into skincare formulations

Enhanced Hydration

Sterols are exceptional at retaining moisture within the skin and products containing sterols can significantly improve hydration levels, making them ideal for incorporating into dry and dehydrated skincare formulations.

Barrier Reinforcement

By mimicking and replenishing natural lipids, sterols fortify the skin barrier, leading to better protection against environmental stressors and a reduction in skin sensitivity.

Anti-Ageing Properties

The ability of sterols to maintain moisture and improve skin elasticity translates to anti-ageing benefits and regular use can result in smoother, more youthful-looking skin.

Anti-Inflammatory Effects

Sterols can help calm inflamed or irritated skin, making them beneficial for conditions such as eczema, psoriasis, and rosacea.

Types of sterols and their functionalities

Cholesterol

A well-known sterol, cholesterol, is integral to maintaining skin barrier integrity and works closely with ceramides and fatty acids to ensure optimal barrier function.

Phytosterols

Effective in reducing inflammation and improving skin hydration and derived from plants, phytosterols such as beta-sitosterol, campesterol, and stigmasterol are known for their skin-soothing and barrier-repairing properties.

Ergosterol

Found in fungi, ergosterol is another sterol with potent skin barrier benefits and helps maintain moisture balance and enhance the skin’s resilience.

Oils high in sterols

Incorporating oils rich in sterols into skincare formulations can provide a myriad of benefits and some of the most sterol-rich oils include:

Avocado Oil

Packed with beta-sitosterol, avocado oil is known for its moisturising and anti-inflammatory properties and can help to soothe and nourish the skin, making it an excellent choice for dry and sensitive skin types.

Soybean Oil

Rich in phytosterols such as beta-sitosterol and campesterol, soybean oil can help to improve skin hydration and barrier function. It’s also a great source of vitamin E, an antioxidant that protects the skin from free radical damage.

Sunflower Seed Oil

Containing significant amounts of beta-sitosterol and campesterol, sunflower seed oil is lightweight and easily absorbed, so is great for moisturising without leaving a greasy residue, making it suitable for all skin types.

Rice Bran Oil

High in both phytosterols and ferulic acid, rice bran oil is beneficial for its anti-ageing and skin-brightening properties, helping to reinforce the skin barrier and retain moisture.

O&3 thoughts…

The ability of sterols to repair and strengthen the skin barrier, along with their hydrating, anti-inflammatory, and anti-ageing properties, makes them an excellent addition to skincare formulations. By understanding the science behind sterols and incorporating sterol-rich oils into your skincare formulations, you can create products that maintain a radiant, healthy complexion.