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Hydrate Serum
HydrateAM / PMWater Layer
$75.00
Hydrate Serum
hydration

Hydrate Serum

A water-binding hydration serum with four molecular weights of hyaluronic acid, Centella, baobab, Aquaxyl, panthenol, and niacinamide. It helps skin feel plumper, smoother, and more comfortable without heaviness.

All Skin TypesHydrateAM / PMLightweight Gel
$75.00 30 ml / 1 fl oz
Size1oz/30ml2oz/60ml
100% PLASTIC-FREE
Formulated & shipped from Resonance Marin, Marin County, CA
Returns accepted within 30 days — half-full minimum
4x
Molecular weights of hyaluronic acid for layered hydration.
AM / PM
Lightweight gel texture designed for daily use.
Damp
Best applied to damp skin before treatment, seal, finish, or SPF.
100%
Plastic-free aluminum packaging, fully recyclable.
The Brief

Hydration that holds
without weight.

Hydrate Serum is the water layer: a lightweight gel serum designed to replenish dehydration, soften the feel of tightness, and help skin look smoother and more comfortable.

Read more

Four molecular weights of hyaluronic acid work with Centella, baobab, Aquaxyl, panthenol, saccharide isomerate, and niacinamide to support layered hydration and barrier comfort. Apply after XO Essence on damp skin, before treatment, defense, seal, finish, or SPF.

Result: skin feels plumper, calmer, and more hydrated without heaviness.

The Brief
Where it fits
Where
it fits.
Morning
or evening.

Hydrate Serum is the water layer. Apply after XO Essence on damp skin, before targeted treatments, Defense Serum, Recovery Cream, Protect Oil, or Shield SPF 35+.

01
Cleanse
Gentle Cleanser
Removes buildup without stripping.

Cleanse first so hydration lands on balanced skin. A non-stripping cleanse keeps the barrier comfortable before the water layer begins.

02
Activate
XO Essence
First layer after cleansing.

Press or mist into damp skin after cleansing. XO Essence helps hydrate, calm, and prepare the surface for Hydrate Serum.

03
Hydrate
Hydrate Serum
Water-binding hydration layer.
You are here

Apply to damp face, neck, and décolleté. Pat or smooth in while skin is still slightly damp, then continue with treatment, defense, seal, finish, or SPF.

04
Treat
Targeted Serum
Choose according to skin need.

Layer C Serum, Clarify Serum, Firming Serum, Renew PM, or another treatment after hydration as your routine requires.

05
Defend
Defense Serum
Environmental stress support.

Apply after hydration when skin needs visible calm, antioxidant support, and barrier resilience before seal or SPF.

06
Protect
Shield SPF 35+
Final morning protection.

Apply as the final morning step. SPF protects the barrier and tone work your routine supports.

Build Around This Step
Choose the next level of commitment: one next step, a pair, a starter trio, or the full system.
XO Essence Activate
First Layer
XO Essence

The hydrosol first layer that prepares skin for Hydrate Serum.

$40.00Discover
Hydration System Complete
Hydration System
Hydration System

The full hydration sequence built around activation, hydration, seal, and protection.

$243.00View System
2015
The first formula that mattered. Every “I have tried everything” client was solving for the wrong layer. Stronger actives. Newer retinoids. Another acid. The gap was never an active. The gap was water.
— Daniella Inbar, Founder
The Science

Water belongs early in the routine: Hydrate Serum helps bind it there, so the layers that follow sit on a more comfortable surface.

01
4-Weight Hyaluronic Acid / Layered Hydration
Four forms of hyaluronic acid support hydration across the surface and deeper-feeling layers. The result is a plumper, smoother, more comfortable feel without a heavy finish.
02
Centella Asiatica / Visible Calm
Gotu kola helps soothe the look of stressed or reactive skin while supporting barrier comfort. It makes Hydrate Serum especially useful when skin feels tight, dry, or easily unsettled.
03
Aquaxyl Complex / Water-Binding Support
Xylitylglucoside, anhydroxylitol, and xylitol help support the skin's water reserves and natural moisturizing factors, so hydration feels more held and less fleeting.
04
Baobab Seed Extract / Barrier Comfort
Hydrolyzed Adansonia Digitata Seed Extract supports a softer, more comfortable skin feel and helps round out the formula's hydration and barrier-support profile.
05
Panthenol + Niacinamide / Smoothness Support
Panthenol supports comfort, while niacinamide helps refine the look of texture and tone. Together, they make Hydrate Serum more than a simple hyaluronic acid step.
From the Treatment Room

Tips
from the spa.

Hydrate Serum began as the water layer we reached for after exfoliation, LED, or microcurrent: a lightweight way to restore comfort before stronger treatment or seal steps. At home, it is the bridge between activation and the rest of the routine.

Damp Skin Layer
Apply Hydrate Serum while skin is still damp from XO Essence. This gives the hyaluronic acid system the water it needs to bind, leaving skin more comfortable before treatment or seal.
Morning Cushion
Layer Hydrate Serum before C Serum, Defense Serum, or Shield SPF 35+ when the morning routine needs more comfort. It helps active steps sit on a hydrated surface.
Travel Hydration
During flights or long travel days, apply Hydrate Serum after XO Essence, then follow with Defense Serum or Recovery Cream depending on how dry the skin feels.
Lightweight Moisture Mix
Blend a small amount with Protect Oil when you want a lighter, breathable finish. Use this when skin is stable and you want hydration plus a soft lipid finish.
The Details

Every question,
answered.

Formulated at Resonance Marin. Tested on real skin. These are the questions that matter most.

Where does Hydrate Serum fit in the system?
Hydrate Serum is the Hydrate step. Use it after Gentle Cleanser and XO Essence, then follow with treatment serums, Defense Serum, Recovery Cream, Protect Oil, or Shield SPF 35+.
Should I apply Hydrate Serum to damp or dry skin?
Damp skin is best. Apply after XO Essence while the skin still feels slightly moist so the hyaluronic acid system has water to bind.
What does Hydrate Serum do for dehydrated skin?
It supports layered hydration, helps reduce the feel of tightness, and leaves skin looking plumper, smoother, and more comfortable.
Is Hydrate Serum suitable for sensitive or reactive skin?
Yes. The lightweight formula includes Centella, panthenol, and barrier-supportive hydration to help skin feel calm and comfortable.
Can I use Hydrate Serum with vitamin C, acids, or retinoids?
Yes. Hydrate Serum can sit before active steps to support comfort. If skin feels sensitive, simplify the routine and seal with Recovery Cream.
How is Hydrate Serum different from other hyaluronic acid serums?
Hydrate Serum combines four forms of hyaluronic acid with Centella, Aquaxyl, panthenol, niacinamide, baobab, and saccharide isomerate for hydration plus barrier comfort.
Does Hydrate Serum replace moisturizer?
No. Hydrate Serum is the water layer. Follow with Recovery Cream, Protect Oil, or another finish when skin needs seal, comfort, or lipid support.
The Scent + Texture
Pale blue gel, water-light comfort.

A lightweight gel serum that spreads easily, absorbs quickly, and leaves skin feeling fresh, cushioned, and hydrated. The finish is smooth and flexible, designed to layer under treatment serums, creams, oils, and SPF.

PeachTop
GeraniumHeart
White Alba RoseHeart
Pale Blue GelTexture
Full Ingredient List
Every ingredient, listed.

Tap to expand the complete INCI ingredient declaration.

Aqua, Propanediol, Sodium Hyaluronate Crosspolymer, Sodium Hyaluronate, Sodium Acetylated Hyaluronate, Hydrolyzed Sodium Hyaluronate, Pentylene Glycol, Hydrolyzed Adansonia Digitata Seed Extract, Centella Asiatica Extract, Saccharide Isomerate, Citric Acid, Sodium Citrate, Scenedesmus Rubescens Extract, Xylitylglucoside, Anhydroxylitol, Xylitol, Panthenol, Niacinamide, Ammonium Acryloyldimethyltaurate/VP Copolymer, Phenoxyethanol, Ethylhexylglycerin

Give every routine its water layer.

Hydrate Serum helps skin feel plumper, calmer, and more comfortable before treatment, seal, finish, or SPF.

$78.00Hydrate Serum
View Hydration System →