The TIAM My Signature C Source (originally known as O.S.T C20 Original Pure Vitamin C Serum) is a Vitamin C Serum with 20% pure Vitamin C. This powerful serum brightens and brings back radiance to the skin, while removing blackheads and treating pigmentation from acne scars. The star ingredient, Vitamin C, is a powerful antioxidant that provides the best in anti-aging protection by reducing fine lines and boosting collagen protection.

NOTE: This product has the tendency to fizz when opened if shaken. To avoid this, please do not shake before use, and let the product stand for 24 hours before opening once you have received the product.

TIP: It's best to store this serum in the refrigerator or a cool, dark place away from direct sunlight or high temperatures. It€™s also best to avoid using any products with high levels of AHA, BHA, and Retinol together with this product