Olive Oil: An ancient oil with impressive biological properties!
Olive oil is much more than just a culinary ingredient. This golden liquid is packed with bioactive compounds that benefit the skin and hair. Rich in antioxidants, essential fatty acids, and anti-inflammatory compounds, it has been attracting the interest of researchers for several years for its dermatological applications. What can we really expect from this ancient oil in terms of skin health? And are there any limits to its use?
1. Lipid richness that supports the skin barrier
Olive oil is mainly composed of:
- Oleic acid (omega-9 : up to 80%): forms a protective film on the skin's surface, limiting water loss and providing a supple and elastic texture.
- Linoleic acid (omega-6): plays a key role in cell cohesion and in repairing the epidermal barrier.
- Squalene : a biomimetic lipid, it deeply moisturizes and protects against external aggressions.
- Palmitic acid : an emollient agent, it contributes to skin softness and limits trans-epidermal water loss.
- Phytosterols and stearic acid : strengthen the skin's impermeability.
This composition allows olive oil to maintain skin hydration, prevent dehydration, and promote healing.
2. Antioxidant activity: a defense against premature aging
Polyphenols (oleuropein, hydroxytyrosol), vitamin E and beta-carotene also contained in olive oil neutralize the free radicals responsible for oxidative stress.
- Proven action on UV rays Some studies have shown that olive oil can inhibit the onset of skin damage caused by ultraviolet rays.
- Prevention of skin aging : reduction in hyperpigmentation, loss of elasticity, and the appearance of wrinkles.
These properties make olive oil an ally in preventing skin photoaging.
3. Inflammation and bacteria: soothing and antimicrobial effects
Thanks to oleic acid and phytosterols :
- Anti-inflammatory effect : reduction of pro-inflammatory cytokines such as TNF-α, which are involved in redness, irritation, and itching.
- Antibacterial activity : demonstrated in vitro action on golden staph, a common pathogen in dermatitis and skin infections.
These results suggest a potential benefit for reactive skin, although clinical data are still limited.
4. Significant hair benefits
. Hydration and shine Olive oil, rich in fatty acids, nourishes the hair fiber and strengthens the scalp's hydrolipidic film.
. Protection against oxidation As with skin, oil protects hair from oxidative damage (pollution, heat, UV rays), limiting breakage and discoloration.
. Hair growth Studies have shown stimulation of the anagen (growth) phase thanks to oleuropein, although further research is still needed.
5. Precautions for use:
- Moderate comedogenicity rating (2/5) : but can clog pores and promote blackheads in oily skin.
- Pure application not recommended for acne-prone or highly reactive skin types.
- Use in cosmetic formulas often more tolerable thanks to controlled dosages and stabilized emulsions.
- Beneficial for normal to dry skin, but may not be recommended for atopic or very sensitive skin, especially when used undiluted.
