How safe and effective are sunscreens
Sunscreens have been recommended and used for several decades. Some manufacturers call their products “sunscreen” and some use the term “sunblock”. Sunscreens can be classified into two major types: chemical and physical. Chemical sunscreens contain special ingredients that act as filters and reduce ultraviolet radiation penetration to the skin. These sunscreens often are colorless and maintain a thin visible film on the skin. These sunscreens usually contain UVB absorbing chemicals and more recently contain UVA absorbers as well.