Halocline Dew Serum 30 ml, in stock — a clear glass dropper bottle with a silver collar, its pipette lying beside it on white
2%Hyaluronic acid
three molecular weights

Hydration you can read on the label, to the decimal.

Dew Serum holds water at three depths of the skin and says exactly how much of each acid is inside. Mixed and filled at our lab on the Biarritz seafront.

€32 · 30 ml
In stock — leaves Biarritz today if ordered by 14:00
Choose your size of Dew Serum
Ceramide 3% Barrier Cream, in stock — a frosted glass jar with a white lid beside a plain kraft box
Mineral SPF 50 Fluid, in stock — two white tubes standing on white discs
Lactic 5% Milk Cleanser, in stock — a white squeeze tube and its cap on a peach block

Twelve on the shelf

Twelve formulas, each named after its active and its strength.

No hero botanicals, no secret complexes. The front of every bottle carries the working ingredient and its percentage; the back carries the full INCI list in order of weight.

Browse all twelve, €19 to €46

Who Dew Serum suits — and when to reach for something else

Four honest answers from the chemists who wrote the formula.

  • Panthenol 5% Calm Gel Cleanser, in stock — a frosted pump bottle next to a bamboo pump block

    Skin that feels tight by noon

    Three sizes of hyaluronic acid sit at three depths, so the tightness does not come back after lunch.

  • Peptide 4% Eye Gel, in stock — a pale pink tube beside its blank pink carton

    Layering under SPF or make-up

    It dries in about forty seconds and leaves no film, so nothing pills on top.

  • Retinal 0.1% Night Emulsion, sold out until 24 November — a glass pipette held over an open dark bottle

    Nights with retinal or acids

    Panthenol at 5% calms the sting that strong actives can leave behind.

  • Azelaic 10% Tone Cream, only six left — three blush-pink round pots on a clay-coloured ground

    Skip it if you want a scrub

    There is no exfoliant inside. For texture, pair it with Tone Cream instead.

A pipette releasing a single drop of clear serum into an open palm

One pipette is 0.5 ml — enough for face and neck.

Niacinamide 10% Clarity Serum, in stock — a frosted dropper bottle with a plain gold band on a sand-coloured shelf
Clarity Serum · Niacinamide 10%€26 · 30 ml · In stock
Open Clarity Serum in the shop
10%Niacinamide
+ 1% zinc PCA

Shine and open pores, answered with one number.

Ten percent niacinamide with 1% zinc PCA. Enough to see a difference in shine within four weeks, below the level where most skins start to flush.

Pairs well with

“My T-zone stopped shining through lunch by the third week. I check the percentage now before I buy anything.”

Inès R., combination skin, reordered twice

A woman laughing with a dot of cream on her cheek
A single smear of white cream on a beige surface

Three questions, then a morning and an evening routine.

Tell us how your skin feels by midday, what you want to change and how many minutes you have. The skin quiz on the Dew Serum page writes your AM and PM steps, with every product priced.

Take the skin quiz →
Water droplets beaded on a pale glass panel

Halocline is for you if you read the back of the bottle first.

Read every INCI list
100%

You want the dose, not the story

Every active in every product is printed with its percentage, front of bottle and INCI list alike, so you can weigh us against anyone — including serums that cost less.

4steps

You would rather use four products than nine

Cleanser, one treatment, moisturiser, SPF. That is the whole shelf.

0fragrance

Scent has let you down before

Nothing is perfumed, and each formula is patch-tested on 30 volunteers.

Squalane 100% Oil, in stock — an amber frosted dropper bottle resting in raked sand

Where it is made

Mixed three hundred metres from the Grande Plage.

Halocline is two cosmetic chemists, Maëlle Etcheverry and Tomás Ibarra, and a filling room above a former surf shop on Rue du Port-Vieux. We make each formula in batches of 400 bottles, print the batch number on the carton and answer every email ourselves.

Squalane comes from olives pressed in Navarre; our glass is made in Normandy and takes our refills.

Write to Maëlle and Tomás →