14 Jan Sunscreen Secrets- One Skin Part 2 of 12
The major cause of skin cancer is UV radiation, both UV-A and UV-B.- SPF sunscreen blocks only UV-B radiation.
- In order to block both UV-A/UV-B rays, the sunscreen must state “broad spectrum protection.”
- SPF 50 blocks 98% rays, SPF 100 blocks 99% rays.There is minimal advantage in using SPF greater than 50.
- No matter the SPF, sunscreen must be reapplied every 90 minutes.
Chemical Sunscreen:
- Filters mostly UV-B radiation.
- Must be applied 20 minutes prior to sun exposure
- Penetrates the skin, undergoes chemical reaction, and then is metabolized by the body.
- Banned in Hawaii due to damage to coral reefs.
- Does not protect against melasma or lentigo.
Physical/Mineral Sunscreen:
- Refers to zinc oxide and titanium dioxide.
- May be applied immediately prior to sun exposure.
- Filters both UV-A and UV-B radiation.
- Reflects UV rays at the skin’s surface.
- Allowed in Hawaii, does not damage coral reefs.
- Protects against melasma and lentigo.