The serum is chosen when the complexion looks dehydrated, less smooth, or less fresh — typical signs include a tight feeling after washing, more visible fine lines that disappear when the skin is hydrated, or a dull, uneven texture. It fits well in several common situations: during autumn and winter when indoor heating lowers humidity; after travel or long days in air-conditioned spaces; when you are using stronger cosmetic actives such as retinoids, high-percentage vitamin C, or exfoliating acids that can impair the barrier and increase water loss; and in the morning under makeup, because a better surface water balance often helps foundation sit more evenly and prevents it from settling into dehydration lines. The liquid format adds a hydrating step without a heavy or occlusive finish, so it works for oily, combination, and normal skin types that dislike rich creams.
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