What are the differences between Physical and Chemical Sunscreens?
Current research has conclusively proven that Chemical Sunscreens act by absorbing UV light for a limited period (related to the SPF factor). These chemicals are able to reach the bloodstream and are found in the liver 72 hours after application! Furthermore, these chemicals are only able to absorb UVB rays (the rays responsible for sunburn) and not UVA rays (the dermally penetrating rays responsible for photo ageing, collagen degeneration and some forms of skin cancer). Physical Sunscreens, on the other hand, act by adhering to the surface of the skin and physically reflecting all the harmful rays (UVA and UVB). They are not absorbed into the bloodstream. Physical sunscreens are a total sun block, provided they are not removed from the surface of the skin. The general rule with Physical Sun blocks is ‘You move it, you lose it!’ Although Physical Sunscreens are water resistant, it is generally recommended that they be reapplied every 80 minutes to account for incidental bodily activiti
