How Sun Protection Factor (SPF) works?

When we talk about skin health, there is a commonly used term Sun Protection Factor (SPF). It is a measure of how much protection sunscreen provides against the sun’s Ultraviolet rays. In other words, SPF measures the ratio of the amount of solar energy needed to sunburn protected skin compared to un-protected skin.

Normally the peak timings of sun exposure are 10:00 AM to 4 PM. So, it is better to avoid these timings, and the best way to protect skin during this time in the sun exposure is to apply SPF. The American Academy of Dermatology recommend applying SPF 30 or higher to all exposed skin daily. You should reapply sunscreen every two hours when outdoor, and after swimming or sweating.

In addition to solar intensity, there are a number of other factors that influence the amount of solar energy that a consumer is exposed to:

skin tone.
quantity of sunscreen applied
frequency of application

Research shows that fair colored skin consumers are likely to absorb more solar energy while dark skinned consumers. The amount of sunscreen applied also impact the amount of solar radiation absorbed, because application of more sunscreen result in less solar energy absorption. Normally, SPF are not waterproof, so after swimming, consumer have to reapply the sunscreen because water may remove the layer of sunscreen from the body.

For the consumers, it is highly recommendable to consult a dermatologist for the skin related issues. Healthy skin may keep you look fresh and feel fresh.