High SPF ratings send the wrong message. You are led to believe that you can apply a high SPF sunscreen and then spend an unlimited amount of time in the sun.

Extended time exposed to UV rays causes the absorption of an undesirable high dose of UV radiation. High SPF sunscreens with chemical UV filters that mimic the hormone estrogen, switch off the red warning signal (red skin) that sunburn represents. This process instills a false sense of security.

It is better to use a moderate SPF and spend less time in the sun, gradually increasing your exposure in successive days, than to use a higher SPF and expose yourself for a longer period the first time out.

The chart below illustrates the relationship between SPF and the percentage of UVB Protection.

SPF and Sun Protection