Phytosterols: What are the dangers of their use in cosmetics?

Phytosterols are compounds naturally found in plants. They belong to the sterol family and have a similar structure and role to the cholesterol present in the human body. Phytosterols are primarily known for their beneficial effects on health, particularly cardiovascular health. However, they also have benefits when applied topically to the skin and hair, and are used in the formulation of many cosmetic products. Phytosterols are particularly renowned for their soothing and repairing virtues, making them allies for sensitive skin. These compounds are also good humectant agents.

Furthermore, phytosterols possess antioxidant properties. These are derived from their cyclic chemical structure, which allows them to stabilise free radicals through electron donation before they can damage DNA and cellular constituents. Finally, a recent study has demonstrated that phytosterols can delay skin ageing. They do this by inhibiting collagenase, the enzyme that breaks down the peptide bonds of collagen. The loss of structure of this compound results in a loss of function and a decrease in skin suppleness.