Topical sunscreen alone cannot totally protect skin: studies have indicated that people do not apply sufficient quantites of product, that many areas are often left uncovered, and that product can be removed by sweating, friction, etc.
Oral protection can help make up for these disadvantages, providing protection to all skin areas and reaching the skin’s deepest layers.
Different formulations for different skin needs:
Sun-sensitive skin, sun-related disorders
Normal skin: protection against sun exposure and UV damage