Hair Serum: Which One Should You Choose for Beautiful Hair Every Day?

Hair Serum: Which One Should You Choose for Beautiful Hair Every Day?


By Hélène Durand

Published on: Wednesday, June 04, 2025, Updated on: Tuesday, November 03, 2026

A true concentrate of active ingredients, hair serum works deep down to moisturise, repair, protect, and enhance your hair. With its lightweight texture, this versatile treatment is suitable for all hair types and provides a targeted solution for every hair concern. Find out how to choose the right one.

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What Is a Hair Serum?

A hair serum is a hair care product with a high concentration of active ingredients. Often a leave-in, it usually has a liquid, light, and non-greasy texture. It makes styling easier and doesn’t weigh the hair down. The serum is designed to work both deep within the hair (restoring keratin) and on the surface (sealing the hair cuticle, preventing split ends).

Please note that the serum is not a substitute for shampoo or conditioner. It complements your hair care routine to provide targeted treatment and a polished finish. Suitable for all hair types, hair serum should be chosen according to the specific hair concern you wish to address.

Why Use It?

To Strengthen and Repair the Hair Fibre

The serum works deep down to repair the internal structure of the hair shaft and restore the bonds between the keratin chains. It thus helps to restore damaged hair and makes it stronger, more resilient, and less prone to breakage.

To Encourage Growth and Slow Hair Loss

It stimulates the regeneration of the hair follicle at the base of the hair and increases its size to promote better anchoring of the hair shaft. The hair becomes denser and more resilient. The serum helps strengthen hair from the root, rebalance the hair shaft’s life cycle, promote growth, and prevent hair loss, whether chronic or occasional.

To Moisturise and Protect

It helps maintain moisture within the hair, strengthening the hair fibre and providing long-lasting protection against dehydration and external damage. The hair is softer, more supple, and shinier.

To Improve the Appearance of the Hair

The serum has a comprehensive effect on the hair fibre. It repairs and strengthens it, deeply moisturises it, coats it and seals the cuticles on its surface. It prevents split ends and reduces frizz, all without weighing the hair down. The result: improved hair health and enhanced appearance.

What Are the Benefits?

Hair Serum has many benefits, including:

  • Repairs and strengthens the hair fibre

  • Intensely moisturises the hair

  • Protects the hair from external damage

  • Prevents split ends

  • Reduces frizz and makes styling easier

  • Gives softness, shine, and radiance to the hair

  • May stimulate hair growth and slow down hair loss

Which Hair Types Is It Suitable For?

Thanks to their light texture, hair serums are suitable for all hair textures and types, and even for sensitive scalps.

Damaged, Brittle, or Split-Ended Hair: Repairing serums deeply restore the hair fibre, rebuild keratin bonds, strengthen the lengths, and minimise the appearance of split ends, while adding softness and shine.

Fine or Weakened Hair: Fortifying serums add body to the hair, stimulate growth, and strengthen the hair’s anchorage, without weighing down the hair fibre thanks to their lightweight texture.

Coloured or Bleached Hair: Protective serums support damaged lengths, prevent breakage, and restore shine and vitality to the hair, while making styling easier and preserving colour.

Dry or Dehydrated Hair: Serums rich in moisturising active ingredients, such as hyaluronic acid, nourish the hair fibre, restore its suppleness, and minimise breakage, leaving hair soft and silky.

Hair Prone to Shedding: Anti-hair loss serums are suitable for all hair types experiencing hair loss, whether caused by stress, nutritional deficiencies, or hormonal changes. They provide a comprehensive solution to slow hair loss and promote growth.

Sensitive Scalps: Soothing serums relieve itching, reduce discomfort, and protect the scalp’s skin barrier.

Which Active Ingredients for Hair Serums Should You Choose?

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Hyaluronic Acid

While the benefits of hyaluronic acid for the skin are widely publicised, its positive effects on hair are still little known. A substance naturally present in the body, hyaluronic acid can retain up to 1,000 times its weight in water. It can help to:

  • Deeply moisturise the hair shaft and the scalp

  • Increase hair volume by adding body, thanks to water retention at the core of the hair

  • Make styling easier by reducing frizz and helping to define curls

  • Add shine by forming a protective film around the hair shaft and smoothing its cuticles

Discover our concentrated hair serum with 3.5% hyaluronic acid
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Keratin

As the main component of the three layers that make up the hair, keratin used in cosmetics repairs, nourishes, and protects the hair. It tightens and smooths the cuticles on the surface of the hair shaft and strengthens its protective layer against external damage. It can help to:

  • Strengthen and restructure the hair by replenishing lost keratin

  • Repair damaged hair

  • Reduce frizz

  • Protect the hair from the harmful effects of heat-styling tools, such as straighteners, curling tongs, or hairdryers

Discover our Keratin AA & Peptides Hair Serum
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Peptides

Peptides are small proteins that are able to penetrate deep into the hair shaft and work at a deep level. They can help to:

  • Stimulate hair growth at the root by prolonging the anagen phase (growth phase) of existing hair

  • Reduce hair loss by inhibiting the production of DHT (dihydrotestosterone), a protein that triggers the catagen phase (resting phase) of the hair and is one of the main factors in baldness

  • Promote the anchoring of hair follicles – the cavities in which hair takes root – by stimulating the synthesis of adhesion molecules (Laminin 5 and Collagen IV)

  • Make the hair more resilient

Discover our Peptides & Pea Extract anti-hair loss hair serum

Which Products Should You Use Alongside Your Serum?

Strength & Shine Solid Shampoo

Strength and shine for your hair: this organic, vegan solid shampoo with a patented formula, enriched with organic hibiscus and mustard oils as well as amla powder, revitalises dull hair without weighing it down. Its economical size is equivalent to two bottles of liquid shampoo and produces a rich lather; made in France, it offers natural, artisanal care.

Discover the Strength & Shine Solid Shampoo

Organic Stinging Nettle Powder

Stinging nettle is beneficial for blemish-prone skin, brittle nails and hair thanks to its high vitamin and mineral content. It is therefore found in many cosmetic products, particularly hair care products (lotions, shampoos, etc.), to tone the scalp and combat hair loss and dandruff.

Discover Organic Stinging Nettle Powder

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Keratin AA & Fruit Acids Detangling and Repairing Conditioner

Designed for damaged hair, this certified organic detangling conditioner repairs, strengthens, and reduces breakage by 94% from the very first use. Free from sulphates and silicones, its innovative Keratin and Fruit Acids complex works both inside and outside the hair fibre for visibly stronger and more beautiful hair.

Discover the AA Keratin & Fruit Acids Detangling and Repairing Conditioner

Scalp Massage Brush

Embrace a new hair care routine with this lightweight, gentle massage brush. Its soft bristles stimulate the scalp, promote microcirculation, exfoliate, and optimise the application of hair care products, for healthy hair. Ideal for working up a generous lather with your shampoo, the massage brush makes it easier to apply hair masks close to the roots. Made from velvety silicone, it can be used in the shower on wet hair or on dry hair for a deeply soothing scalp massage.

Discover the Scalp Massage Brush

Our Natural Serum Recipes

Precautions

When applying the serum, it is best not to touch the scalp with the pipette to keep the product clean and avoid any potential contamination. Store your bottle away from heat and light. Observe the use-by date indicated on the packaging to avoid any issues. If you are refilling the product, clean the bottle and pipette thoroughly.

Expert Advice

Although hair serums have a light texture, it is best to stick to the recommended amounts (usually the equivalent of 1 to 2 pipettes) to avoid any greasy or sticky residue, particularly on fine hair.

Spotlight on Our Writer: Hélène Durand

FEATURED PHOTO – Hélène Durand_Ok

With a dual background in literature and marketing, Hélène Durand uses her writing to explore topics that are meaningful to her: natural beauty, well-being, and a healthy lifestyle. Through her articles, she aims to share a supportive perspective and practical advice.

Bibliography

  1. Passeport Santé, Hair Serum, November 2024.

  2. Ducray, How to use and apply a hair serum?

Frequently Asked Questions

Frequently Asked Questions