Skin Health, Sun Protection/Damage
Sun and Light Protection: Do SPFs From Different Products Add Up To Higher Protection?
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It’s not simple addition. An SPF 15 powder plus an SPF 5 blush do not give you an SPF of 20.

The total value would still be around SPF 15, or possibly just a little more IF different sunscreen actives are present in the blush that aren’t in the powder.

For more on the different types of damaging light and other important information, read Sun and Light Skintelligence: Must Knows.