Hydra-Cool Serum

Water, delivered and held

Sodium hyaluronate second in the formula binds water at the surface in quantity, and pantothenic acid, vitamin B5 itself, the same molecule skin uses in its own repair metabolism, sits right behind it, supporting hydration and recovery at once.

The calming trio

Centella asiatica appears as its three named actives, asiaticoside, asiatic and madecassic acids, the fraction the wound-comfort research is actually built on, with polyporus mushroom extract in support. This is the bench you want pointed at skin that is irritated, over-exfoliated or freshly treated.

The cool

Menthol delivers the immediate temperature drop the name promises, brief, clean and genuinely pleasant on hot or reactive skin. The blue is a nod of dye; the relief is real chemistry.

The design philosophy

Eleven ingredients and nothing speculative: when skin is unhappy, the shortest formula that does the job is the right one.

Dehydrated, overheated, post-sun and post-workout skin; faces mid-retinoid or mid-acid adjustment needing a peacemaker; and recovery weeks after clinic treatments once your practitioner clears serums. All skin types, including sensitive.

Worth knowing

Fragrance-free. The menthol cool is mild but present, skin with genuinely broken barrier may prefer to wait a few days before adding even this. Contains a cosmetic colourant (Blue 1).

Morning and/or evening on clean skin: 3–4 drops pressed over face and neck, followed by moisturiser. Reapply to hot or tight patches any time, it layers over itself without complaint.

Keep it in the fridge in summer; the name earns itself twice over.

Use alongside

The classic iS pairing runs Active Serum first, Hydra-Cool over it once dry, the push and the cushion. It also calms retinoid nights across any brand, sits under every moisturiser on the shelf, and holds the hydration-serum chair alongside HA Densimatrix and Surge: choose by feel, this is the one with the cool, calming lean. After clinic treatments, follow your practitioner’s timing.