Follow the guidance on the specific product. For example, overnight masks like Blue Copper 5 PRIME Sleep Tight Mask are designed for nighttime use and layer on as your last step. Each product page lists its recommended frequency.
Follow the guidance on the specific product. For example, overnight masks like Blue Copper 5 PRIME Sleep Tight Mask are designed for nighttime use and layer on as your last step. Each product page lists its recommended frequency.