Tanning and Red Light Therapy Glossary
Browse the glossary using this index
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Seasonal affective disorder
Seasonal affective disorder (SAD) is episodes of depression that occur at a certain time of the year, usually during winter. The disorder may begin during the teen years or in early adulthood. Like other forms of depression, it occurs more often in women than in men.
The sun protection factor of a sunscreen is a laboratory measure of the effectiveness of sunscreen — the higher the SPF, the more protection a sunscreen offers against UV-B