In a skincare routine, when should a serum be applied relative to sunscreen?

In a skincare routine, when should a serum be applied relative to sunscreen?

• A. After sunscreen
• B. Before sunscreen
• C. After moisturizer
• D. Before moisturizer

Answer: (D)

Layering order matters because serums are lightweight, highly concentrated formulas that deliver active ingredients deep into the skin, while moisturizers are thicker and create a barrier to seal in hydration. To maximize absorption, apply the serum first, then the moisturizer so the cream can lock in the serum’s benefits. Sunscreen should be the final step, sitting on top to shield the skin from UV rays without interfering with absorption. So the serum is applied before the moisturizer (and sunscreen comes afterward).

Layering order matters because serums are lightweight, highly concentrated formulas that deliver active ingredients deep into the skin, while moisturizers are thicker and create a barrier to seal in hydration. To maximize absorption, apply the serum first, then the moisturizer so the cream can lock in the serum’s benefits. Sunscreen should be the final step, sitting on top to shield the skin from UV rays without interfering with absorption. So the serum is applied before the moisturizer (and sunscreen comes afterward).