No refunds or returns on sample/tester items An oil-free formula, ideal for all skin types Helps increase the elasticity and resilience of the skin Improves texture, tone and overall radiance This is a bottle of Cellex-C Serum for Sensitive Skin never been used and it is still sealed. Cellex-C Serum for Sensitive Skin helps to regenerate connective tissue and collagen while it protects the skin from damage from free radicals and environmental harm. Regular use will reduce fine lines, wrinkles, and other visible signs of aging.