How to layer serums without wasting money
Thinnest first, richest last. Vitamin C in the morning, retinol at night. Never both.
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## The order
Cleanse → toner → serums (thin to thick) → moisturiser → SPF.
## The vit-C + retinol clash
Don't layer them in the same routine. Vitamin C likes daytime (brightens, protects under SPF). Retinol likes nighttime (repair cycle, no UV interference).