Corals are underwater skeletal structures that form coral reefs. This natural formation is a source of calcium, which is used in medicine to help strengthen fractured bones or enrich the skin with calcium. Calcium in the skin is considered one of the most important elements, as it forms part of the epidermis and is responsible for the skin barrier.

Eye pads with coral are said to help restore calcium levels in the skin, which may reduce skin sensitivity to environmental factors. Due to the natural origin of coral, the calcium is easily absorbed.