A lightweight cosmetic liquid used as a hydration step.
What it is, why people use it, the evidence, and what to know before trying it.
Water-binding ingredients can increase surface hydration, depending on composition and use with other products. A serum texture alone does not identify active ingredients or biological effects.
Regulatory status: Cosmetic when used for cleansing or appearance; therapeutic claims may change the applicable regulation.
Evidence basis: Human clinical evidence
A hydration serum may support skin comfort. No universal formula or required extra step is established, and a simple moisturizer may already address dryness.
Confidence: weak
Situations where this practice may need modification or professional guidance.
Products can cause irritation or contact allergy. Introduce unfamiliar products cautiously, avoid application to damaged skin or the eyes unless intended, and stop use if a reaction develops.
Public protocols that include Hydrating serum. Open one to see the full context and source.
Session and schedule patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.
Reviewed branded products and distinct forms related to Hydrating serum. A listing is not an endorsement.
SK-II
A liquid facial essence associated with SK-II’s Pitera fermented ingredient.
Continue into interventions that appear alongside this one.