Strengthens skin barrier and helps protect against daily irritants, such as pollution and micro-dust, that can lead to signs of premature aging Ideal serum for irritated skin and sensitive skin Helps boost skin's barrier recovery in times of stress Supports skin barrier recovery after professional treatments: When used for 3 weeks before a professional skin peel, The Concentrate helped skin's barrier strength begin to return to pre-treatment levels in the hours immediately following the peel* Helps improve skin barrier strength in 14 days** *Clinical testing on 22 women, after using product twice daily for 3 weeks prior to a professional-strength skin peel. **Clinical testing on 23 women, after using product for 14 days.