Hyaluronic acid

Also known as HA · sodium hyaluronate

BEVIDENCE

Put the water back.

The honest take

The most misunderstood ingredient in skincare. HA doesn't conjure hydration — it's a sponge that holds water that's already there, or that you give it. On damp skin, sealed in, it plumps. On dry skin in dry air, it can pull water out of you. Technique matters more than the price of the bottle.

What it is

A humectant that holds many times its weight in water; found in skin naturally.

How it works

Hyaluronic acid is a humectant — a molecule that binds many times its weight in water. Your skin already makes it; a topical tops up the surface, filling fine lines with water for a smoother, plumper look. Different molecular weights sit at different depths, which is why 'multi-weight' formulas read fuller.

What it does

Draws and holds water in the skin for a plumper, smoother, more hydrated look.

Who it's for

Everyone. It's the beige basic that makes everything else look better — especially skin that looks tired, tight or flat after travel, training or a long night.

How to use it

Apply to damp skin, then lock it under a moisturiser. That seal is the step people skip, and it's the whole game. Morning and night, under everything.

What to expect

Immediate plumping and a smoother surface — it's a same-day ingredient. It's a hydration step, not an anti-ageing one. The glow is water, and that's completely fine.

The research

Well established as a topical hydrator with a long safety record. The evidence is about the appearance of hydration and smoothness, not structural change.

Evidence grades describe how well an ingredient is studied — A well-supported, C emerging — not a promise of results. Educational, not medical advice. Doses are typical ranges; follow the label on the product.