Ingredient guide
Water (Aqua)
water
In short
Water (Aqua) (also known as aqua) is a skincare solvent. It is backed by a strong body of published research. It is often chosen for dry, sensitive, combination and oily skin. MIRU describes it by what is visible on skin — never as a treatment or cure.
Reviewed against published evidence · editorially independent · no brand pays for placement
Skin type
Dry · Sensitive · Combination · Oily
Best used
Anytime
What it is
The solvent base of most formulas. Carries the water-soluble ingredients; no active role of its own.
Also found as
Where to find it
Round Lab Dokdo Toner
Mineral-water base, low-fragrance. A calm everyday hydrator.
Fit comes first: the Lens checks each product against your skin before any retailer link. We may earn a commission, at no cost to you — picks are editorial, never paid.
Common questions
What does Water (Aqua) do for skin?
The solvent base of most formulas. Carries the water-soluble ingredients; no active role of its own. MIRU frames ingredients by what is visible, not by medical claims.
When should I use Water (Aqua)?
Water (Aqua) is typically used morning or evening. Introduce any new active on its own first and add one product at a time so you can see how your skin responds.
Is Water (Aqua) suitable for my skin type?
Water (Aqua) is often chosen for dry, sensitive, combination and oily skin. It is generally considered well tolerated — if your skin is reactive, patch-test first and watch for any irritation.
Checking a product label? Use the product checker to rate the full list against your current focus.
Personal guidance only · For clinical concerns, see a dermatologist.