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Best Hair Hydrating Serum of 2026
Last updated on 03/04/2026
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1
Kérastase Genesis Hair Serum, Nourishing & Fortifying Leave-In Conditioner, For Weakened Hair Prone to Hair Loss, With Ginger Root & Edelweiss Flower, Sérum Anti-Chute Fortifiant, 90 ml
KÉRASTASE
23% Off
Why we love it
Combats hair loss effectively.
Revitalises hair from root.
Activates healthy hair growth.
Main Highlights
Sérum Fortifiant is a daily treatment to combat hair loss in thinning and fragile hair. Enriched with Aminexil, Ginger Root, and Caffeine; it revitalises the hair from within the root, calms and reduces scalp irritation, and slows hair loss
Strengthening hair fibre from the root to tip, the serum activates microcirculation of nutrients to stimulate healthy hair growth
30 day treatment plan: Apply treatment once per day for 30 days, in the morning or evening. Distribute 4 pipettes to the scalp, gently massage, then style as usual. Do not rinse. To optimise your anti-hair loss routine, combine your treatment with 10 day Cure Fortifiantes Anti-Fall treatment plan
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9.7
Exceptional
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9.7
Exceptional
KÉRASTASE
Kérastase Genesis Hair Serum, Nourishing & Fortifying Leave-In Conditioner, For Weakened Hair Prone to Hair Loss, With Ginger Root & Edelweiss Flower, Sérum Anti-Chute Fortifiant, 90 ml
23% Off
Check Price
Show More
Why we love it
Combats hair loss effectively.
Revitalises hair from root.
Activates healthy hair growth.
Main Highlights
Sérum Fortifiant is a daily treatment to combat hair loss in thinning and fragile hair. Enriched with Aminexil, Ginger Root, and Caffeine; it revitalises the hair from within the root, calms and reduces scalp irritation, and slows hair loss
Strengthening hair fibre from the root to tip, the serum activates microcirculation of nutrients to stimulate healthy hair growth
30 day treatment plan: Apply treatment once per day for 30 days, in the morning or evening. Distribute 4 pipettes to the scalp, gently massage, then style as usual. Do not rinse. To optimise your anti-hair loss routine, combine your treatment with 10 day Cure Fortifiantes Anti-Fall treatment plan
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Value for Money
2
Kérastase Nutritive Nourishing Hair Serum with Niacinamide, Overnight Leave-In Treatment for Dry Hair, Lightweight and Non-Greasy, 8H Magic Night Serum, 90 ml
KÉRASTASE
27% Off
Why we love it
Revitalizes dry hair overnight.
Battles frizz and extra volume.
No rinse needed in morning.
Main Highlights
8H Magic Night Serum by Kérastase is a beauty sleep high-nutrition serum for dry hair. This overnight treatment contains anti-dryness polymers for immediate care with a light, non-greasy finish. It also delivers essential nutrients that boost the formula’s ability to nourish and reinforce the hair.
Protects hair from frizz and extra volume caused by pillow friction. Refreshes hairs shine, strength and softness.
1. Spread a pump of serum in your hands and distribute this overnight hair treatment to the lengths and ends of your dry or damp hair. 2. No need to rinse in the morning. Tip: Apply 8H Magic Night Serum before bedtime.
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9.6
Superb
Check Price
9.6
Superb
KÉRASTASE
Kérastase Nutritive Nourishing Hair Serum with Niacinamide, Overnight Leave-In Treatment for Dry Hair, Lightweight and Non-Greasy, 8H Magic Night Serum, 90 ml
27% Off
Check Price
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Why we love it
Revitalizes dry hair overnight.
Battles frizz and extra volume.
No rinse needed in morning.
Main Highlights
8H Magic Night Serum by Kérastase is a beauty sleep high-nutrition serum for dry hair. This overnight treatment contains anti-dryness polymers for immediate care with a light, non-greasy finish. It also delivers essential nutrients that boost the formula’s ability to nourish and reinforce the hair.
Protects hair from frizz and extra volume caused by pillow friction. Refreshes hairs shine, strength and softness.
1. Spread a pump of serum in your hands and distribute this overnight hair treatment to the lengths and ends of your dry or damp hair. 2. No need to rinse in the morning. Tip: Apply 8H Magic Night Serum before bedtime.
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3
Kérastase Nutritive, Hydrating Scalp Serum for Dry Hair, With Niacinamide and Vitamins, Moisturising and Revitalising, Fast Absorbing and Non Greasy, Nutri-Supplement, 90 ml
KÉRASTASE
23% Off
Why we love it
Deeply nourishes dry hair.
Provides immediate hydration boost.
Enriched with essential vitamins.
Main Highlights
Nutri-Supplement Scalp Serum by Kérastase is a moisturizing scalp serum for dry scalps. This is our ultimate scalp treatment: a niacinamide serum that provides vitamins to deeply nourish dry hair. Acting like a nutrient supplement for the scalp, it has a milky, fast-absorbing texture.
Immediate hydration boost for dry scalps. Moisturises the scalp and leaves it feeling refreshed, healthy and immediately more comfortable. Enriched with vitamins.
1. Apply section by section on dry or damp scalp (2 to 4 doses depending on hair thickness). 2. Massage to distribute evenly. 3. Blow dry, do not rinse. Use as often as needed.
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9.5
Superb
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9.5
Superb
KÉRASTASE
Kérastase Nutritive, Hydrating Scalp Serum for Dry Hair, With Niacinamide and Vitamins, Moisturising and Revitalising, Fast Absorbing and Non Greasy, Nutri-Supplement, 90 ml
23% Off
Check Price
Show More
Why we love it
Deeply nourishes dry hair.
Provides immediate hydration boost.
Enriched with essential vitamins.
Main Highlights
Nutri-Supplement Scalp Serum by Kérastase is a moisturizing scalp serum for dry scalps. This is our ultimate scalp treatment: a niacinamide serum that provides vitamins to deeply nourish dry hair. Acting like a nutrient supplement for the scalp, it has a milky, fast-absorbing texture.
Immediate hydration boost for dry scalps. Moisturises the scalp and leaves it feeling refreshed, healthy and immediately more comfortable. Enriched with vitamins.
1. Apply section by section on dry or damp scalp (2 to 4 doses depending on hair thickness). 2. Massage to distribute evenly. 3. Blow dry, do not rinse. Use as often as needed.
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4
The Ordinary Multi-Peptide Serum for Hair Density and Scalp Support, Peptide-Powered Formula for Thicker, Fuller Looking Hair, 60ml
The Ordinary
20% Off
Why we love it
Promotes thicker, fuller hair.
Powered by advanced peptide technologies.
Nourishing plant-based ingredients used.
Main Highlights
CONCENTRATED HAIR TREATMENT: A lightweight leave-in serum designed to promote thicker, fuller, and denser-looking hair by supporting the scalp.
PEPTIDE TECHNOLOGIES: Formulated with REDENSYL, Procapil, CAPIXYL, BAICAPIL, AnaGain, and High-Solubility Caffeine to visibly enhance hair vitality and promote a denser appearance.
PLANT-BASED EXTRACTS: Contains natural ingredients such as Larix Europaea Wood Extract, Pisum Sativum Extract, and Camellia Sinensis Leaf Extract to nourish the scalp.
DAILY USE: Apply a few drops to clean, dry scalp once daily, preferably at bedtime, for optimal results.
FREE FROM: Cruelty-free, gluten-free, vegan, alcohol-free, and silicone-free.
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9.4
Superb
Check Price
9.4
Superb
The Ordinary
The Ordinary Multi-Peptide Serum for Hair Density and Scalp Support, Peptide-Powered Formula for Thicker, Fuller Looking Hair, 60ml
20% Off
Check Price
Show More
Why we love it
Promotes thicker, fuller hair.
Powered by advanced peptide technologies.
Nourishing plant-based ingredients used.
Main Highlights
CONCENTRATED HAIR TREATMENT: A lightweight leave-in serum designed to promote thicker, fuller, and denser-looking hair by supporting the scalp.
PEPTIDE TECHNOLOGIES: Formulated with REDENSYL, Procapil, CAPIXYL, BAICAPIL, AnaGain, and High-Solubility Caffeine to visibly enhance hair vitality and promote a denser appearance.
PLANT-BASED EXTRACTS: Contains natural ingredients such as Larix Europaea Wood Extract, Pisum Sativum Extract, and Camellia Sinensis Leaf Extract to nourish the scalp.
DAILY USE: Apply a few drops to clean, dry scalp once daily, preferably at bedtime, for optimal results.
FREE FROM: Cruelty-free, gluten-free, vegan, alcohol-free, and silicone-free.
Show More
5
E45 Hydrating Scalp Serum, Protects Against Dryness, Itch & Irritation, Helps Reduce Dandruff & Sebum, Moisturises Sensitive Skin, Fragrance Free, 150ml
E45
Why we love it
Hydrates and protects irritated scalps.
Gentle formula for sensitive skin.
Trusted skincare expertise since 1952.
Main Highlights
HYDRATES AND PROTECTS IRRITATED SCALPS: E45’s Scalp Serum is non-sticky, leave in formula that hydrates and protects. Easily slotting into your existing hair care routine, our formula helps remove excess sebum, reduce dandruff and soothe itchiness
GENTLE, MOISTURISING INGREDIENTS: Our serum is designed to be left on overnight, with its kind-to-skin ingredients such as betaine, glycerin, and squalane that helps moisturise the skin on the scalp. Contains ACTISCALP, a plant-powered ingredient that clears and soothes.
SUITABLE FOR SENSITIVE SKIN: Our Scalp Serum has been dermatologically tested and is suitable to use on sensitive skin. With its soap free formula, it is also suitable for use on eczema-prone skin. No added fragrance.
QUALITY SKINCARE EVERY DAY – For 60 years, E45 has been an expert in treatment for eczema, psoriasis, ichthyosis and other dry skin conditions. We understand the importance of quality everyday products that care for you with minimal fuss. The E45 range of products has been developed for different parts of the body and works hard to protect and maintain your health with proven dermatological expertise
HISTORY OF E45 – First released in 1952 after a customer request for a product that would soothe and protect the skin. In 1963 physicians noticed the benefits of E45 cream for dry-skin conditions and our range was introduced to pharmacy and retail in 1980. We’ve continued to create products and strive to serve the needs of patients and healthcare professionals and produce better treatment options for patients' skincare routines.
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9.2
Superb
Check Price
9.2
Superb
E45
E45 Hydrating Scalp Serum, Protects Against Dryness, Itch & Irritation, Helps Reduce Dandruff & Sebum, Moisturises Sensitive Skin, Fragrance Free, 150ml
Check Price
Show More
Why we love it
Hydrates and protects irritated scalps.
Gentle formula for sensitive skin.
Trusted skincare expertise since 1952.
Main Highlights
HYDRATES AND PROTECTS IRRITATED SCALPS: E45’s Scalp Serum is non-sticky, leave in formula that hydrates and protects. Easily slotting into your existing hair care routine, our formula helps remove excess sebum, reduce dandruff and soothe itchiness
GENTLE, MOISTURISING INGREDIENTS: Our serum is designed to be left on overnight, with its kind-to-skin ingredients such as betaine, glycerin, and squalane that helps moisturise the skin on the scalp. Contains ACTISCALP, a plant-powered ingredient that clears and soothes.
SUITABLE FOR SENSITIVE SKIN: Our Scalp Serum has been dermatologically tested and is suitable to use on sensitive skin. With its soap free formula, it is also suitable for use on eczema-prone skin. No added fragrance.
QUALITY SKINCARE EVERY DAY – For 60 years, E45 has been an expert in treatment for eczema, psoriasis, ichthyosis and other dry skin conditions. We understand the importance of quality everyday products that care for you with minimal fuss. The E45 range of products has been developed for different parts of the body and works hard to protect and maintain your health with proven dermatological expertise
HISTORY OF E45 – First released in 1952 after a customer request for a product that would soothe and protect the skin. In 1963 physicians noticed the benefits of E45 cream for dry-skin conditions and our range was introduced to pharmacy and retail in 1980. We’ve continued to create products and strive to serve the needs of patients and healthcare professionals and produce better treatment options for patients' skincare routines.
Show More
6
L'Oréal Paris Elvive Extraordinary Oil Miracle Hair Serum, Intense Nourishment, Up to 6x more Shine, up to 230° heat protection, suitable for all hair types, 100ml
L'Oreal Paris
28% Off
Why we love it
Transforms dry, dull hair.
Provides luxurious shine.
Offers heat protection.
Main Highlights
Nourish your dry hair with Elvive Extraordinary Oil: Dry hair can lack nourishment leaving it feeling rough, dull and lifeless. Bathe your hair in nourishment from root to tip for rich, shiny hair.
Formula made with luxurious oils: 6 flower oil extracts with nourishing properties for luxurious shine & no flyaways. Leaves your hair feeling beautifully nourished, soft and supple. A non-greasy formula and gives a weightless finishing touch designed for use by all hair types.
Leaves your hair feeling beautifully nourished, soft and supple. A non-greasy formula and gives a weightless finishing touch designed for use by all hair types.
Heat protection from up to 230°C protection: Use this product with heat appliances or take it on holiday to protect hair from sun damage.
Mutli-purpose and ultra-versatile product: It can be used before shampooing for nourishment, before styling to help protect and transform your hair, or as a finishing touch for exceptual shine.
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9.2
Superb
Check Price
9.2
Superb
L'Oreal Paris
L'Oréal Paris Elvive Extraordinary Oil Miracle Hair Serum, Intense Nourishment, Up to 6x more Shine, up to 230° heat protection, suitable for all hair types, 100ml
28% Off
Check Price
Show More
Why we love it
Transforms dry, dull hair.
Provides luxurious shine.
Offers heat protection.
Main Highlights
Nourish your dry hair with Elvive Extraordinary Oil: Dry hair can lack nourishment leaving it feeling rough, dull and lifeless. Bathe your hair in nourishment from root to tip for rich, shiny hair.
Formula made with luxurious oils: 6 flower oil extracts with nourishing properties for luxurious shine & no flyaways. Leaves your hair feeling beautifully nourished, soft and supple. A non-greasy formula and gives a weightless finishing touch designed for use by all hair types.
Leaves your hair feeling beautifully nourished, soft and supple. A non-greasy formula and gives a weightless finishing touch designed for use by all hair types.
Heat protection from up to 230°C protection: Use this product with heat appliances or take it on holiday to protect hair from sun damage.
Mutli-purpose and ultra-versatile product: It can be used before shampooing for nourishment, before styling to help protect and transform your hair, or as a finishing touch for exceptual shine.
Show More
7
The Ordinary Hair Care Natural Moisturizing Factors + HA, Lightweight Hydrating Scalp Serum with Hyaluronic Acid and Squalane, 60ml
The Ordinary
20% Off
Why we love it
Hydrating formula for combination skin.
Luxurious shea butter scent.
Lightweight gel absorbs quickly.
Main Highlights
Natural Moisturizing Factors + HA For Scalp is a light, milky formula designed to support scalp hydration and help ease discomfort caused by dryness. By utilizing a combination of ingredients that mimic natural moisturizing factors, along with hyaluronic acid and squalane that are naturally produced within the skin, this moisturizing serum helps support the scalp’s barrier without sticking to your hair or weighing it down.
MIMICS NATURAL MOISTURE: Formulated with natural moisturizing factors, squalane, and hyaluronic acid to support the scalp's barrier.
NON-GREASY FORMULA: Hydrates the scalp without weighing down hair or leaving it greasy.
DAILY LEAVE-IN TREATMENT: Massage a few drops into a clean, dry scalp once daily, ideally at bedtime.
FREE FROM: Vegan, cruelty-free, silicone-free, alcohol-free, and gluten-free formulation.
Show More
9.1
Superb
Check Price
9.1
Superb
The Ordinary
The Ordinary Hair Care Natural Moisturizing Factors + HA, Lightweight Hydrating Scalp Serum with Hyaluronic Acid and Squalane, 60ml
20% Off
Check Price
Show More
Why we love it
Hydrating formula for combination skin.
Luxurious shea butter scent.
Lightweight gel absorbs quickly.
Main Highlights
Natural Moisturizing Factors + HA For Scalp is a light, milky formula designed to support scalp hydration and help ease discomfort caused by dryness. By utilizing a combination of ingredients that mimic natural moisturizing factors, along with hyaluronic acid and squalane that are naturally produced within the skin, this moisturizing serum helps support the scalp’s barrier without sticking to your hair or weighing it down.
MIMICS NATURAL MOISTURE: Formulated with natural moisturizing factors, squalane, and hyaluronic acid to support the scalp's barrier.
NON-GREASY FORMULA: Hydrates the scalp without weighing down hair or leaving it greasy.
DAILY LEAVE-IN TREATMENT: Massage a few drops into a clean, dry scalp once daily, ideally at bedtime.
FREE FROM: Vegan, cruelty-free, silicone-free, alcohol-free, and gluten-free formulation.
Show More
8
Avon Advance Techniques Absolute Nourishment Argan Hair Serum 30ml, Multi-Tasking Hair Treatment, Formulated with Argan Oil, Restores Shine and Health to Damaged Hair, Cruelty Free
Avon
Why we love it
Infused with nourishing argan oil.
Hydrates without weighing hair down.
Smooths flyaways and strengthens hair.
Main Highlights
INSTANTLY RESTORES SHINE AND HEALTH TO DAMAGED HAIR - Looking for the ultimate treatment for your dry, damaged hair? Want sleek luscious hair that looks and feels healthy? Our Absolute Nourishment Argan Treatment Serum is infused with argan oil to instantly restore shine and health to dry and damaged hair.
NOURISHING ARGAN - The Absolute Nourishment Argan Treatment Oil leaves hair feeling soft, strong and nourished and is suitable for all hair types. Designed to instantly revitalise dry and damaged hair.
HOW TO USE - Apply product evenly through damp or dry hair, from lengths to ends. Do not rinse. Use pre-blow dry for easy styling and a smooth finish.
CRUELTY FREE - We don't test a single product or ounce of ingredient on animals. In fact, we're actively against it, campaigning for acceptance on non-animal testing methods for more than 3 decades.
AVON - We're passionate about keeping you at the centre of beauty, creating products that embrace the latest trends and cutting-edge technology, alongside everyday essentials that will be the staples of your beauty kit.
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9.0
Superb
Check Price
9.0
Superb
Avon
Avon Advance Techniques Absolute Nourishment Argan Hair Serum 30ml, Multi-Tasking Hair Treatment, Formulated with Argan Oil, Restores Shine and Health to Damaged Hair, Cruelty Free
Check Price
Show More
Why we love it
Infused with nourishing argan oil.
Hydrates without weighing hair down.
Smooths flyaways and strengthens hair.
Main Highlights
INSTANTLY RESTORES SHINE AND HEALTH TO DAMAGED HAIR - Looking for the ultimate treatment for your dry, damaged hair? Want sleek luscious hair that looks and feels healthy? Our Absolute Nourishment Argan Treatment Serum is infused with argan oil to instantly restore shine and health to dry and damaged hair.
NOURISHING ARGAN - The Absolute Nourishment Argan Treatment Oil leaves hair feeling soft, strong and nourished and is suitable for all hair types. Designed to instantly revitalise dry and damaged hair.
HOW TO USE - Apply product evenly through damp or dry hair, from lengths to ends. Do not rinse. Use pre-blow dry for easy styling and a smooth finish.
CRUELTY FREE - We don't test a single product or ounce of ingredient on animals. In fact, we're actively against it, campaigning for acceptance on non-animal testing methods for more than 3 decades.
AVON - We're passionate about keeping you at the centre of beauty, creating products that embrace the latest trends and cutting-edge technology, alongside everyday essentials that will be the staples of your beauty kit.
Show More
9
L'Oréal Paris Elvive Extraordinary Coconut Oil Miracle Hair Serum, Intense Nourishment, Up to 6x more Shine, up to 230° heat protection, suitable for all hair types, 100ml
L'Oreal Paris
42% Off
Why we love it
Feels incredibly nourished.
Showcases satin shine.
Tames beautifully.
Main Highlights
Feels intensely nourished
Satin shine
Beautifully tamed
Expert tailor-made care beyond beautiful hair
A luxurious texture infused with fine Coconut Oil
Show More
8.8
Excellent
Check Price
8.8
Excellent
L'Oreal Paris
L'Oréal Paris Elvive Extraordinary Coconut Oil Miracle Hair Serum, Intense Nourishment, Up to 6x more Shine, up to 230° heat protection, suitable for all hair types, 100ml
42% Off
Check Price
Show More
Why we love it
Feels incredibly nourished.
Showcases satin shine.
Tames beautifully.
Main Highlights
Feels intensely nourished
Satin shine
Beautifully tamed
Expert tailor-made care beyond beautiful hair
A luxurious texture infused with fine Coconut Oil
Show More
10
John Frieda Frizz Ease The Hydro Sealer Moisture Protect Serum 50ml
John Frieda
33% Off
Why we love it
Locks in moisture, fights frizz.
Lightweight serum, no greasy feel.
Heat protection up to 230°C.
Main Highlights
Locks in moisture to hydrate and soften Shields hair from frizz and humidity for up to 72 hours
Lightweight serum with no greasy feel
Heat protection up to 230°C
Vegan formula with packaging made from 100% post-consumer recycled material (container only)
Enriched with Kukui Nut Oil and Hemisqualane
Show More
8.7
Excellent
Check Price
8.7
Excellent
John Frieda
John Frieda Frizz Ease The Hydro Sealer Moisture Protect Serum 50ml
33% Off
Check Price
Show More
Why we love it
Locks in moisture, fights frizz.
Lightweight serum, no greasy feel.
Heat protection up to 230°C.
Main Highlights
Locks in moisture to hydrate and soften Shields hair from frizz and humidity for up to 72 hours
Lightweight serum with no greasy feel
Heat protection up to 230°C
Vegan formula with packaging made from 100% post-consumer recycled material (container only)
Enriched with Kukui Nut Oil and Hemisqualane
Show More