Detailed answer

While some people prefer to store their serums in the refrigerator, it is not necessary. Storing serums in a cool, dark place away from direct sunlight is sufficient to maintain their efficacy. Extreme temperature changes can potentially degrade the formula or alter its texture. However, if you live in a very hot and humid climate, storing serums in the refrigerator can provide a refreshing and cooling effect when applied to the skin. Ultimately, it is a matter of personal preference and convenience.