Finding the right hydrating serum isn't just about grabbing the one with hyaluronic acid on the label — it's about matching the formula to what your skin actually needs. Whether you're dealing with everyday dehydration, a compromised barrier, or excess oil that still somehow feels parched, there's a specific INKEY serum built for you. New to hyaluronic acid?

Read our complete guide to what hyaluronic acid is and does first, then come back here to shop.

Hyaluronic Acid Serum 30ml - $13.50

Best for : Everyday hydration, all skin types

Key Ingredients : 2% Multi-Molecular HA, Matrixyl 3000™

Rating : 4.7 (3,075 reviews)

Hyaluronic Acid Serum 60ml - $24

Best for : Hyaluronic Acid lovers

Key Ingredients : 2% Multi-Molecular HA, Matrixyl 3000™

Rating : 4.7 (3,075 reviews)

Ectoin Hydro-Barrier Serum 30ml - $20

Best for : Sensitive, barrier-damaged or reactive skin

Key Ingredients : 2% Ectoin, 2.5% Multi-Molecular HA, Ceramides

Rating : 4.6 (416 reviews)

10% Niacinamide Serum 30ml - $14

Best for : Oily, blemish-prone or combination skin

Key Ingredients : 10% Niacinamide, Hyaluronic Acid

Rating : 4.5 (735 reviews)

💡Not sure where to start? Take our 2-minute Skin Quiz and we'll tell you exactly which serum your skin needs - plus build your full routine.

Hyaluronic Acid Serum - 30ml | $13.50

★★★★★ 4.7 Stars | 3,075 Reviews | Award-Winning

The one that started it all. Our cult-favourite HA Serum delivers instant, lasting hydration in a lightweight, non-sticky formula - clinically proven to plump, firm, and smooth skin, with 82% of users seeing firmer, smoother skin in just 4 weeks.**

If your skin feels tight after cleansing, looks dull by midday, or drinks up every moisturiser you throw at it without feeling satisfied - this is the serum you've been missing.

Why it works:

2% Multi-Molecular Hyaluronic Acid draws water into multiple layers of skin and holds it there, while Matrixyl 3000™ Peptide firms and smooths skin over time. Apply on damp skin for maximum absorption.

Best for: Dry skin, dehydrated skin, normal skin, mature skin, first-time serum users
Skin types: All skin types | Sensitive skin | Pregnancy & breastfeeding safe | Teen approved
Targets: Dehydration, fine lines & wrinkles, damaged skin barrier

- Clinically proven instant hydration*
- 82% firmer, smoother skin in 4 weeks**
- 86% agreed lightweight, quick-absorbing & non-tacky**
- Award-winning: Allure 2022, CEW 2023, Get The Gloss Gold 2023

*4-week independent clinical study of 22 people under dermatological control // **4-week independent consumer study of 22 people under dermatological control

Hyaluronic Acid Serum - 60ml | $24

The same clinically proven formula. Twice the hydration. Even better value.

Already an INKEY Hyaluronic Acid convert? The 60ml gives you double the product - that's approximately 120 uses - in the same award-winning formula you love. If this serum is already a staple in your AM and PM routine, this is the smarter buy.

Why upgrade: Same 2% Multi-Molecular HA and Matrixyl 3000™ Peptide formula. More uses per bottle. Lower cost-per-use.

Best for: Existing customers, daily AM + PM users, anyone who hates running out

Ectoin Hydro-Barrier Serum - 30ml | $20

★★★★★ 4.6 Stars | 416 Reviews | As seen in Vogue, Grazia & Marie Claire

If your skin reacts to everything, feels permanently tight or dry, or you've been over-exfoliating and need to hit the reset button - this is the serum you need. The Ectoin Hydro-Barrier Serum doesn't just hydrate; it simultaneously repairs your skin barrier while delivering deep, multi-layered moisture.

Standard HA serums hydrate. This one hydrates and heals.

Why it works:

2% Ectoin - originally discovered in desert bacteria - is a clinically proven barrier stabiliser that protects skin cells from environmental stress and repairs compromised barrier function in as little as 15 minutes.* Combined with 2.5% Multi-Molecular Hyaluronic Acid (4 types, for deep multi-level hydration) and 1% Barrier Blend with 3 Ceramides, it strengthens your skin's natural defences while locking in moisture long-term.

Best for: Sensitive skin, rosacea-prone skin, barrier-damaged skin (from over-exfoliation, harsh weather, or active treatments like retinol or isotretinoin), menopausal skin
Skin types: All skin types | Sensitive skin | Pregnancy & breastfeeding safe
Targets: Compromised skin barrier, dehydration, dryness, flakiness, dullness

- Clinically proven to hydrate + strengthen barrier in 15 minutes*
- Visibly restores skin bounce in 3 days*
- Improves 5 signs of a compromised skin barrier**
- Oil-free, silicone-free, fragrance-free, alcohol-free

*Clinical study of 31 people | **4-week clinical study of 26 people

What our customers say

"Magic Potion! My menopausal skin crisis happened just as this product was launched. My skin was suddenly reacting to products I had used for months. It did an amazing job of calming my skin." — Bridget, verified buyer

10% Niacinamide Serum - 30ml | $14

★★★★★ 4.5 Stars | 735 Reviews | As seen in Cosmopolitan & Stylist Magazine

Oily skin is dehydrated skin too - it just doesn't look it. When your skin overproduces oil, it's often because your skin barrier is crying out for moisture. The answer isn't to strip it further; it's to balance it. Our 10% Niacinamide Serum regulates oil production, minimises the appearance of pores, and calms blemishes - while Hyaluronic Acid ensures your skin stays hydrated throughout.

The result? Clearer, more balanced skin. Without the dryness that most blemish treatments cause.

Why it works:

10% Niacinamide (Vitamin B3) is the optimal concentration for visible oil control and pore refinement - effective enough to make a real difference, gentle enough for daily use on even sensitive or reactive skin. Paired with Hyaluronic Acid for balanced hydration that won't feel heavy or pore-blocking.

Best for: Oily skin, combination skin, blemish-prone skin, enlarged pores, anyone using retinol who needs a buffer
Skin types: All skin types | Sensitive skin | Pregnancy & breastfeeding safe
Targets: Excess oil, redness, breakouts & blemishes

- Visibly reduces excess oil, blemishes, and enlarged pores
- Gentle enough for daily AM + PM use
- Works with retinol - apply first to reduce potential irritation
- Lightweight - layers easily under SPF and makeup

What our customers say :

"It's very gentle and hydrating, doesn't irritate the skin." — Kooshul C., verified buyer

"I've always found it hard to find a routine to manage my dry but acne prone skin. These products helped reduce my inflammation, whilst also keeping my skin really hydrated." — Charlotte, verified buyer

Answer 5 quick questions and we'll tell you exactly which serum is built for your skin — and build you a full routine around it. Free, personalised, takes 2 minutes.