How long can I use a skincare product after opening?

Immediate Answer: Most skincare lasts 6-12 months after opening (check packaging for "Period After Opening" symbol—typically shows "6M" for 6 months). Vitamin C and retinol products may degrade faster if light-exposed.

The Science: Opened products are exposed to air and potential contamination. Preservatives in cosmetics prevent bacterial growth for a limited time:

• Most serums/creams: 6-12 months after opening
• Vitamin C serums: 3-6 months (degrades faster)
• Retinol products: 6-12 months (depends on packaging)
• Oils: Up to 12 months (naturally more stable)

Check the packaging for "Period After Opening" (PAO) symbol showing months (M) after opening.

All Nordic Formula Products Display PAO Symbols Showing Recommended Use Periods:

• Power Glow Serum: 6 months
• Advanced Face Repair: 12 months
• Dark Spot Treatment patches: 12 months
• Daycream Defence Repair SPF 50: 12 months

Proper storage (cool, dark place) maintains these timelines.

Pro Tip: Date your products when opening (marker on bottle). Discard after PAO period passes. Using expired products risks reduced efficacy and possible contamination.