The old theory is a shot full for the whole body...if you are in a bathing suit, that may not be enough as per Dermatologist Cheryl Karcher.
SPF is not everything...the number gauges how well a sunscreen fends off UVB light, but not UVB rays. Scan the label for BROAD SPECTRUM and more than one of the following ingredient...Avobenzone, Mexoryl, Titanium Dioxide or Zinc Oxide.
Sunscreen weakens when exposed to heat and light. Store it in a cool place, not your trunk of the car. Get formulas with stabilizing ingredients such as Helioplex or Dermaplex
You may need sunscreen indoors...if your windows are not treated, your home or office won't be protected from damaging rays. as per Dermotologist Francesca Fusco.
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