Calming Serum Enriched with a plant-based active complex of Cardiospermum, Echium, and Sunflower, the CALMING SERUM by Dr. Barbara Sturm soothes and rebalances irritated skin. Purslane, a powerful anti-aging ingredient, helps calm the skin and reduce visible signs of irritation. Perfect for soothing the complexion after sun exposure, shaving, lack of sleep, jet lag, air conditioning, or environmental pollution. With continued use, this serum strengthens the skin's natural defenses while minimizing its sensitization response.