Why does the hyaluronic acid serum’s formula include a recommendation to increase water consumption?

Hyaluronic acid is a humectant — it attracts and binds water at the skin’s surface, drawing primarily from ambient humidity and the moisture delivered by the serum itself. When your skin is well hydrated from within, topical hyaluronic acid has more to work with, which amplifies its plumping and smoothing effect. Drinking adequate water throughout the day helps ensure your skin stays properly hydrated from the inside out, making topical HA more effective. This is especially relevant in dry climates or during winter months, when ambient humidity drops sharply — and only in those rare, extreme low-humidity conditions can a humectant occasionally draw on deeper skin moisture rather than the surrounding air. Layering a moisturizer or facial oil on top helps trap the serum’s moisture and prevents moisture loss — or the potential for drawing moisture from the skin. Staying well hydrated also supports overall skin barrier function, which is the foundation for how effectively any skincare ingredient can perform.