Best Serum Routine Before a Long Flight to Prevent Skin Dehydration The best serum routine before a long flight to prevent skin dehydration is a simple one: gentle cleansing, an optional hydrating serum, then a moisturizer that suits your skin. A serum is not a substitute for moisturizer, and layering several serums is not necessary. … Continue reading Best Serum Routine Before a Long Flight to Prevent Skin Dehydration