Phytosterols: These plant compounds could transform your skin!
Phytosterols, also known as plant sterols, are lipid molecules naturally present in plant cell membranes. Their chemical structure is similar to that of human cholesterol, giving them a unique ability to interact with the skin's biological mechanisms.
They are extracted from vegetable oils such as soybean, corn, sunflower, rapeseed, and avocado oils. They are also found in certain seeds, berries, and whole grains such as oats, wheat, and brown rice.
Biological mechanisms of action on the skin
1. Hydration and improvement of the skin barrier
Thanks to their ability to capture and retain water, phytosterols help maintain good skin hydration. They also strengthen the skin barrier, limiting water loss and protecting the skin from external aggressions.
2. Skin repair and regeneration:
Phytosterols promote epidermal regeneration by stimulating the activity of fibroblasts, the cells responsible for producing collagen and elastin. They are therefore beneficial for improving skin elasticity and reducing scars, particularly those caused by acne.
3. Anti-inflammatory and soothing properties:
Phytosterols help reduce skin inflammation by inhibiting certain enzymes responsible for inflammatory reactions. They are particularly effective in soothing sensitive skin or skin prone to redness.
4. Antioxidant effect:
By neutralizing free radicals, phytosterols protect the skin from oxidative stress, which is responsible for premature aging. This action helps to maintain youthful, radiant skin.
Applications in dermo-cosmetics
1. Care for sensitive skin
Thanks to their soothing action, phytosterols are included in many products designed for reactive, atopic, or redness-prone skin. They significantly reduce itching and skin discomfort.
2. Prevention of skin aging
By preventing the breakdown of collagen fibers, these compounds help maintain skin elasticity. Regular use is part of a preventive approach to photoaging.
3. Hair and scalp care
Less common but promising, phytosterols also offer benefits for sensitive scalps. They soothe irritation, moisturize the hair fiber, and may play a role in combating the oxidation responsible for hair depigmentation, but further studies need to be validated.
Safety and tolerance
No adverse effects have been reported with topical application of phytosterols. They are considered safe, even for children as young as 3 years old. These active ingredients are not contraindicated during pregnancy or breastfeeding. In cosmetics, they are generally incorporated in concentrations of less than 5%%, which is sufficient to reap the benefits without causing lipid overload.
