Q: How should I adjust my routine for different seasons? 

A: Seasonal modifications optimize product performance: 

Winter Adjustments: 

• Increased dryness: Use 4D HA serum more frequently, consider heavier moisturizer over retinol cream 

• Reduced retinol tolerance: May need to decrease 3% retinol frequency due to harsh weather 

• Indoor heating: Use humidifiers and more frequent snail mucin masks 

• Barrier protection: Layer products for extra protection against wind and cold 

Summer Modifications: 

• Lighter application: May need less moisturizer due to humidity and heat 

• Enhanced sun protection: Crucial due to 3% retinol photosensitivity – SPF 50+ recommended 

• Sweat considerations: Allow products to fully absorb before activities 

• Travel adjustments: Modify routine for vacation climates