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Choosing a facial serum: a practical guide to hydration, redness and a more even complexion

A facial serum can be a targeted step in your skincare routine. However, it is not wise to rely solely on terms such as “glow”, “glass skin” or “deep hydration”. The right choice depends mainly on your skin type, the ingredients and how easily the product fits into your routine.

Common mistakes when buying a serum

1. Mistaking a long ingredients list for a better formula

A serum with lots of active ingredients may sound appealing, but multiple actives can also be difficult to combine. A vitamin C serum, azelaic acid serum and retinol product, for example, each have their own usage advice. For beginners, one clear goal is often more practical than a formula that promises to do everything at once.

2. Assessing a percentage without context

A higher percentage is not automatically more suitable. With a serum for sensitive skin, the concentration, frequency of use and additional ingredients are at least as important. According to the product information, the SKIN1004 Madagascar Centella Azelaic Acid 10 Ampoule contains 10% azelaic acid. The manufacturer recommends introducing it gradually and using it every other day at first.

3. Confusing hydration with a lasting result

A hydrating serum can temporarily make your skin feel smoother, but it does not replace a moisturiser. Ingredients such as glycerine and hyaluronic acid help attract and retain moisture; a cream then helps seal in your skincare. Also, do not expect a cosmetic product to have a medical effect. If you have ongoing skin concerns, advice from a doctor or dermatologist is more appropriate.

Which specifications should you check?

1. Start by choosing your main skincare goal

Choose your serum based on the concern you most want to address:

  • Dry or tight-feeling skin: look for glycerine, panthenol, beta-glucan and hyaluronic acid. A hyaluronic acid serum, such as Hyaluronic Acid Hydrating Serum or Torriden DIVE IN, is a good fit for a routine focused on moisture.
  • Dull skin or an uneven complexion: look for ingredients such as alpha-arbutin, niacinamide, vitamin C derivatives or tranexamic acid. According to the ingredients list, Beauty Of Joseon Glow Deep Serum contains 2% alpha-arbutin.
  • Visible redness or blemish-prone skin: azelaic acid, centella asiatica and panthenol are commonly used cosmetic ingredients in routines of this kind. Assess how well they work based on the product description and your own experience, rather than on absolute brand claims.
  • Mature skin and a less firm appearance: peptides, adenosine and hydrating ingredients are often found in an anti-ageing serum. According to brands’ own research and claims, these formulas may contribute to a smoother-looking skin surface; this is not a guaranteed or medical result.

2. Check the texture

A watery formula usually feels light and often works well under sun cream or make-up. A gel serum may be suitable for combination or oily skin. A richer texture can feel more comfortable on dry skin, but may feel less comfortable if you already use several creams.

Also look out for fragrances and alcohol if your skin reacts easily. “Fragrance free” or “alcohol free” is a product specification, not a guarantee that everyone will tolerate the product without problems. Always read the current packaging, as ingredients may change.

3. Consider the size, shelf life and usage advice

A 30 ml bottle is standard, while a 100 or 150 ml booster may offer better value if you use the product every day. Check:

  • the best-before date on the packaging;
  • the recommended amount;
  • whether the product is intended for morning, evening or both;
  • whether you need to use sun cream during the day;
  • whether a patch test is recommended.

Test a new serum on a small area of skin first. Stop using it if you experience persistent irritation, itching, swelling or a burning sensation. Do not apply active serums to damaged, sunburnt or irritated skin.

Recommended facial serums by user profile

Suitable for: Budget-conscious beginners
Cosrx Hyaluronic Acid Hydrating Serum

Hyaluronic Acid Hydrating Serum

Why it suits this profile: According to the product information, the formula comes in a 100 ml size and is designed for a simple hydrating routine. This makes it a practical introduction to a hyaluronic acid serum.

How this product avoids the pitfall

The ingredients list is easy to understand and includes sodium hyaluronate, panthenol and allantoin, among others, without a lengthy combination of exfoliating actives.

Key benefit & highlights

100 ml size; simple formula; suitable for use morning and evening according to the product description.

Suitable for: Shoppers seeking premium quality
Torriden DIVE IN Low Molecule Hyaluronic Acid Serum 50ml

Torriden DIVE IN Low Molecule Hyaluronic Acid Serum 50ml

Why it suits this profile: According to the product information, this Korean serum combines five types of hyaluronic acid with panthenol, ceramide NP and beta-glucan.

How this product avoids the pitfall

The product information lists specific hydrating components rather than making only a general glow promise. The serum is also fragrance-free according to the details provided.

Key benefit & highlights

50 ml size; five forms of hyaluronic acid; contains ceramide NP and beta-glucan.

Suitable for: Targeted use & intensive users
SKIN1004 Azelaic Acid 10% Ampoule

SKIN1004 Azelaic Acid 10% Ampoule

Why it suits this profile: According to the product description, the formula is intended for blemish-prone or sensitive skin and contains centella asiatica. The formula is niacinamide-free.

How this product avoids the pitfall

The percentage of azelaic acid is clearly stated. The usage instructions recommend starting once or twice a week and gradually increasing the frequency.

Key benefit & highlights

10% azelaic acid; niacinamide-free formula; centella asiatica; 30 ml size.

Suitable for: Fans of brightening routines
Beauty Of Joseon Glow Deep Serum Rich + Alpha Arbutin 30ml

Beauty Of Joseon Glow Deep Serum Rich + Alpha Arbutin 30ml

Why it suits this profile: According to the listed ingredients, this Korean serum contains rice bran water, 2% alpha-arbutin, niacinamide and panthenol.

How this product avoids the pitfall

The brightening positioning is linked to the stated ingredients, rather than relying solely on a general “glow” term. The manufacturer recommends using it in the evening.

Key benefit & highlights

30 ml size; 2% alpha-arbutin; rice bran water; alcohol-free and fragrance-free according to the product details.

Looking for more options?

We have put together a complete, up-to-date list of products that fully meet these strict selection criteria and the applicable European safety regulations.

How to use a facial serum in your routine

  1. Cleanse your face and use toner if required.
  2. Apply a few drops of serum to dry or slightly damp skin, depending on the product advice.
  3. Gently pat the product in without rubbing hard.
  4. Follow with a moisturiser.
  5. Apply sun cream during the day, especially when using products containing vitamin C, azelaic acid, retinol or exfoliating ingredients.

At first, do not combine several strong actives. For example, start with a hydrating serum and add a vitamin C serum or serum for pigmentation later. Keep track of which products cause irritation.

Frequently asked questions about facial serums

Do I need a serum if I already use a moisturiser?

No. A serum is an additional step for a specific goal, such as hydration, more radiant-looking skin or caring for blemishes. A moisturiser remains useful for sealing in your skincare.

How long does a serum last?

This depends on the size and the amount used each time. A 30 ml bottle will usually run out sooner with daily use than a 50, 100 or 150 ml product. Follow the expiry information and the open-jar symbol indicating how long to use the product after opening.

Can I use a serum for sensitive skin every day?

That depends on the formula. A simple hydrating serum is often described as suitable for daily use, while an azelaic acid serum or vitamin C serum may be better introduced gradually. Test a small amount first and stop if you experience clear irritation.