What is the Role of Face Serum?

What is the Role of Face Serum?

By Bertrand Michaud · 7 May 2026 · 4 min

Cosmeticherry published on 7 May 2026 · the editors, our method

In brief

  • Le sérum est un traitement liquide très concentré en actifs, plus léger qu'une crème et à pénétration rapide et profonde.
  • Il existe des formules pour l'hydratation intense, l'éclat, la réduction des pores et l'apaisement des rougeurs.
  • L'acide hyaluronique peut retenir jusqu'à 1000 fois son poids en eau.
  • On applique 3 à 5 gouttes de sérum sur une peau propre, avant la crème hydratante.
  • Parmi les inconvénients figurent le coût plus élevé et de possibles irritations sur peau sensible.

Are you hesitant to add a serum to your beauty routine, but you’re not sure exactly what it’s for or if it’s really necessary? In this article, discover the concrete benefits of face serum, how to choose it well, and how to use it to get the best results. You can also visit Garnier for additional skincare tips.

What is Face Serum and What are its Main Roles?

Definition: Le sérum est un traitement liquide hautement concentré en ingrédients actifs, plus léger qu'une crème, qui pénètre rapidement et profondément dans la peau.

Serum is a liquid treatment highly concentrated in active ingredients. Lighter than a cream, it penetrates quickly and deeply into the skin. That high concentration makes serum much more effective than a classic moisturizer.

Each serum has its specialty. Some fight wrinkles, others tackle acne or dark spots. Formulas also exist for:

  • Intense hydration
  • Skin radiance
  • Pore reduction
  • Soothing redness

Its effectiveness comes from powerful ingredients like vitamin C, hyaluronic acid, or peptides, precisely dosed. Serum acts as a targeted booster: it addresses the exact problem you're concerned about, whereas a classic cream remains more generalist.

Pour compléter votre routine ciblée, découvrez comment fonctionne une crème anti-rides.

Different Types of Serums and Their Active Ingredients

Each type of serum targets a specific skin need through its active ingredients. For dehydrated skin, hyaluronic acid leads the hydrating treatments: it can retain up to 1000 times its weight in water. Dull skin, for its part, responds to vitamin C, a powerful antioxidant that naturally brightens the complexion while reducing signs of aging.

Oily skin should turn to treatments containing salicylic acid, which help unclog pores and regulate excess sebum. Mature skin benefits from serums with peptides and retinol, which stimulate collagen production. Sensitive skin is not left out: gentle formulas enriched with aloe vera, chamomile, and panthenol provide all the necessary comfort.

Si les pores obstrués vous concernent, apprenez à identifier et traiter les points noirs.

Quel sérum pour quel besoin de peau ?
Type de peau Actifs cités Effet recherché
Peau déshydratéeAcide hyaluroniqueHydratation
Peau terneVitamine CÉclat et réduction des signes de l'âge
Peau grasseAcide salicyliqueDésobstruer les pores et réguler le sébum
Peau maturePeptides et rétinolStimulation du collagène
Peau sensibleAloe vera, camomille, panthénolApaisement et confort

How to Properly Apply Face Serum?

Start with a clean face: clean skin is key for active ingredients to penetrate effectively. Take 3 to 5 drops of serum in the palm of your hands, that's plenty.

Warm the product between your palms, then pat it gently onto your skin. Don't forget your neck and décolletage. Wait a few minutes for absorption before the rest of your routine.

Apply serum before moisturizer: the latter creates a protective barrier that keeps active ingredients in contact with your skin longer. In the morning, finish with sunscreen.

When should You Apply Face Serum?

Most serums go on twice a day, morning and night. Some products are formulated for single daily use, so read the label carefully.

Adapt your treatments to the time of day. In the morning, opt for a vitamin C serum that protects your skin from daily aggressions. In the evening, choose a repairing hyaluronic acid serum instead.

New to serums? Start with one application per day, then gradually increase it depending on your skin's reaction. Be consistent to see results.

Après l'application du sérum, vous pouvez aussi tout savoir sur le ridoki facial.

Tips for Choosing the Right Serum for your Skin

Choosing the right serum starts with knowing your skin. A simple guide based on your needs:

  • Oily or blemish-prone skin? Opt for lightweight formulas with salicylic acid or niacinamide. These active ingredients regulate sebum production without weighing down the skin.
  • Dry skin requires treatments rich in sodium hyaluronate and ceramides. These ingredients provide the hydration your skin craves.
  • For mature skin, favor products containing retinol and peptides. They help maintain firmness and reduce wrinkles.
  • If your skin is sensitive, look for soothing formulas without fragrance or alcohol. Those based on panthenol or bisabolol are your best allies.

A practical tip: always start by testing the serum on a small area for a few days. Your skin will quickly tell you if the product suits it.

And don't forget: it's better to have one well-chosen product than several used without thought.

Mieux vaut un seul produit bien choisi que plusieurs utilisés sans réflexion.

Words from une conseillère en soins de la peau

What we keep: Pour choisir son sérum, il faut d'abord connaître sa peau et privilégier un seul produit bien choisi plutôt que plusieurs utilisés sans réflexion.

What are the Disadvantages of Face Serum?

Face serums have drawbacks despite their benefits. First, cost: concentrated in active ingredients, these treatments are often more expensive than other cosmetic products, which can impact your beauty budget.

Then there are potential skin reactions. Formulas concentrated in active ingredients can sometimes cause irritation, especially on sensitive skin. Redness, itching, or a tingling sensation are signs that should alert you. In this case, don't insist: stop using the product and opt for gentler treatments.

To limit these risks, always start by testing the serum on a small area of your face for a few days. And if you notice any unusual reaction, consult a dermatologist.

Read next

Frequently asked questions

Qu'est-ce qu'un sérum visage ?

C'est un traitement liquide hautement concentré en actifs, plus léger qu'une crème. Il pénètre rapidement et profondément dans la peau, ce qui le rend plus efficace qu'un hydratant classique.

Quand appliquer son sérum visage ?

La plupart des sérums s'appliquent deux fois par jour, matin et soir. Certains produits sont formulés pour un usage quotidien unique, il faut donc lire l'étiquette. Le matin, on privilégie un sérum à la vitamine C, le soir un sérum réparateur à l'acide hyaluronique.

Comment bien appliquer un sérum ?

On part d'une peau propre, on prend 3 à 5 gouttes dans le creux des mains et on réchauffe le produit entre les paumes. On tapote doucement sur la peau, sans oublier le cou et le décolleté, puis on attend quelques minutes avant la suite de la routine.

Quels sont les inconvénients du sérum visage ?

Le coût d'abord : concentrés en actifs, ces soins sont souvent plus chers que d'autres produits cosmétiques. Des réactions cutanées sont aussi possibles, comme des rougeurs, des démangeaisons ou des picotements, surtout sur peau sensible.

Portrait of Bertrand Michaud

Who writes here?

Bertrand Michaud, editor in chief of Cosmeticherry. Every article starts from ingredient lists, instructions for use and safety precautions, which I read and compare before writing.

Articles touching on skin health rely on recognised public sources: they inform without replacing a medical consultation. Each article is dated and reviewed when information changes. To report an error or add a detail: Write to us