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tideline
Tideline Age-Defying Serum, a white airless pump bottle on warm linen in soft window light
Age-Defying Serum applied to the neck and décolleté of a woman in warm light

treat · face & neck

age-defying serum

A serum for skin that has earned its lines.

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An emollient age-defying serum that drinks into the skin — hyaluronic acid and squalane for moisture, stabilised vitamin C and E to brighten and defend.

Age-Defying Serum applied to the neck and décolleté of a woman in warm light

the formulation note

a serum for skin that has earned its lines.

Skin in transition holds less water and shows time first. This serum answers it: sodium hyaluronate and squalane flood the skin with lasting moisture, while stabilised vitamin C (tetrahexyldecyl ascorbate) and vitamin E brighten and defend against daily stress.

A whisper of caffeine wakes tired skin; lavender keeps it calm. The finish is firmer, plumper, more luminous — never tight.

Skin in transition holds less water than it used to, and it shows first where the skin is thinnest. This is not a cream you apply and hope about. It is a serum — thinner, faster, meant to go in rather than sit on — and it treats the face and the neck as the single continuous surface they have always been.

specifics

Hydration is carried by squalane and glycerin, with sodium hyaluronate holding water in the upper layers. Hydrolyzed soy protein and dipalmitoyl hydroxyproline support elasticity and the look of fine lines, while tetrahexyldecyl ascorbate — a stable, oil-soluble form of vitamin C that does not brown in the bottle the way pure ascorbic acid does — works alongside tocopheryl acetate to brighten and defend. A little caffeine wakes tired skin; lavender keeps the scent quiet. The texture is a light emollient serum that presses in and disappears, so you can dress over it. 30 ml, made in North America.

the difference

  • most neck creamssit on top, thick.
  • age-defying serumpresses in, then gone.
  • most vitamin Coxidises. This form does not.
read more on the formulation note

water

Squalane, glycerin and hyaluronate for skin that holds less of it now.

lipids

Rosehip, grape seed and jojoba for the oils skin makes less of.

tone

Stabilised vitamin C and vitamin E for the skin that shows time first.

key ingredients

  • A frosted glass dropper bottle mid-drop on bone-cream linen

    squalane

    plant lipid, mimics what skin makes less of.

  • A frosted dish of pale solution beside a small powder pile on bone-cream linen

    sodium hyaluronate

    hyaluronic acid, holds water in the upper layers.

  • A small ceramic spoon of pale ivory balm beside a folded muslin cloth

    hydrolyzed soy protein

    plant protein, supports elasticity and fine lines.

  • Fresh green leaves on linen with a small ceramic dish of botanical extract

    aloe leaf juice

    cool relief for skin that bristles easily.

the ritual

three quiet steps.

01

clean, dry skin

Morning and evening, before anything else goes on.

02

two or three drops

Pressed into face and neck. Around the eye, never on it.

03

seal, then protect

Follow with your oil or cream. SPF in daylight.

Water (Aqua), Glycerin, Isopropyl Palmitate, Dimethicone, Squalane, Hydroxyethylacrylate/Sodium Acryloyldimethyl Taurate Copolymer, Dipalmitoyl Hydroxyproline, Aloe Barbadensis Leaf Juice, Polysorbate 60, Isohexadecane, Hydrolyzed Soy Protein, Phenoxyethanol, Tocopheryl Acetate, Caprylyl Glycol, Ethylhexylglycerin, Hexylene Glycol, Lavandula Angustifolia (Lavender) Oil, Caffeine, Propylene Glycol, Tetrahexyldecyl Ascorbate, Sodium Hyaluronate, Sodium Hydroxymethylglycinate. 1 fl. oz. / 30 ml. Made in USA.

  1. 01clean, dry skinMorning and evening, before anything else goes on.
  2. 02two or three dropsPressed into face and neck. Around the eye, never on it.
  3. 03seal, then protectFollow with your oil or cream. SPF in daylight.

We publish the full ingredient list rather than a study we did not run. Cosmetic-only language throughout — nothing here treats, cures or repairs. What each ingredient is for, and what this line refuses to put in a bottle, is set out at /pages/science.

Made in North America. Recyclable packaging. No refill or take-back scheme — see /pages/sustainability for what we do and do not claim.

Vegan · cruelty-free · paraben-free.

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Made in North America

pair with the daily ritual

the ritual is three steps.

a closing note

Apply morning and evening to clean face and neck, before your oil and moisturiser.

read the full formulation note→

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