Choosing a face serum: a practical guide to skin type, ingredients and use

A face serum can be a useful addition to your daily skincare routine, but there is a huge range to choose from. A Korean face serum, vitamin C serum, hydrating serum or retinol serum may each have a different formulation and set of usage instructions. Focusing mainly on striking claims or a high concentration does not automatically mean you will buy a product that suits your skin.

The following pitfalls are common:

• Choosing a popular ingredient without looking at the full formula. Niacinamide, vitamin C, retinol and hyaluronic acid can all be useful within a formula, but the other ingredients also affect how a serum feels and how suitable it is for your skin.
• Choosing a serum based on a skin concern alone. A serum for blemishes or one designed to refine the appearance of pores is not automatically suitable for dry or sensitive skin. Texture, any added fragrances and the presence of multiple active ingredients also matter.
• Using too many products at once. Combining several intensive serums can leave your skin feeling uncomfortable. Retinol, retinal, vitamin C derivatives and products featuring spicule or ‘shot’ technology in particular should be introduced gradually.

Which specifications should you check?

1. Consider both your skin goal and the texture

For dry skin, a hydrating serum containing glycerine, panthenol, betaine or hyaluronic acid is an obvious choice. Hyaluronic acid can sometimes appear in different forms, such as sodium hyaluronate and hydrolyzed hyaluronic acid. This does not, by itself, indicate how powerful the product is, but it does provide information about the structure of the formula.

Oily or blemish-prone skin may benefit more from a lightweight, fast-absorbing texture. Also look out for ingredients such as azelaic acid, niacinamide or Centella Asiatica. According to SKIN1004’s product description, the Azelaic Acid 10% Ampoule is intended for oily and blemish-prone skin and this formula does not contain niacinamide. This may be relevant if you prefer to avoid niacinamide.

2. Check the active ingredients and usage instructions

A vitamin C serum may contain ascorbic acid or a vitamin C derivative, such as 3-O-ethyl ascorbic acid, sodium ascorbyl phosphate or ascorbyl glucoside. The ingredients list helps you identify which form is present. During the day, use sunscreen when this is recommended in the product information.

Extra care is needed with a retinol serum or retinal product. The SKIN1004 Retinol 0.2 Boosting Shot Ampoule lists retinol and retinal among its ingredients and, according to the usage instructions, recommends starting with two to three applications per week. According to the safety information, the product is not intended for use during pregnancy or breastfeeding unless otherwise advised by a healthcare professional.

3. Check the size, shelf life and origin

Do not compare the price alone; consider the size too. A 30 ml serum and a 100 ml ampoule are not directly comparable. Check the best-before date, batch information and period after opening on the packaging. Store the product in a cool, dry place away from direct sunlight unless the label states otherwise.

A product with a long ingredients list is not automatically more suitable. Above all, check that a clear ingredients list, usage instructions and safety information are available. For products from South Korea, it is also useful to check the information about the responsible party within the European market.

Choosing a face serum by user profile

Suitable for: Budget-conscious beginners

SKIN1004 Madagascar Centella Ampoule 55 ml

Why it suits this profile: A simple choice for anyone who wants to start with one lightweight serum and is mainly looking for hydration without building an extensive routine.

How this product avoids the pitfall

The product description mentions a lightweight formula with Centella Asiatica. This means you do not need to combine several active serums straight away.

Key benefit & highlights

55 ml capacity; Centella Asiatica is at the heart of the formula; suitable for applying after cleansing.

Suitable for: Shoppers seeking premium quality

Dear Klairs Vitamin PDRN Bouncy Pore Serum 35mL

Why it suits this profile: Suitable for users who want to target pores, an uneven complexion and a dull appearance as part of one daily routine.

How this product avoids the pitfall

The formula lists five forms of vitamin C and niacinamide. First check that your skin tolerates this combination, and use sun protection during the day.

Key benefit & highlights

35 ml capacity; five listed forms of vitamin C; lightweight, fast-absorbing texture according to the product description.

Suitable for: Targeted use & intensive users

SKIN1004 Madagascar Centella Retinol 0.2 Boosting Shot Ampoule 9ml

Why it suits this profile: Intended for users who want to build a targeted retinol routine and are prepared to adjust the frequency carefully.

How this product avoids the pitfall

The usage instructions recommend a gradual introduction: start with two to three applications per week, exclusively in the evening, using a small amount.

Key benefit & highlights

Contains retinol and retinal; 9 ml for targeted use; also contains glycerine, squalane, panthenol and Centella Asiatica.

How to use a serum in your routine

1. Cleanse your face and gently pat your skin dry.
2. Apply a small amount of serum. For many products, two to three drops are enough, but follow the label.
3. Follow with a moisturiser to complete your skincare routine.
4. During the day, apply a broad-spectrum sunscreen when recommended in the product information.
5. Introduce one new active product at a time. This makes it easier to identify the source of any irritation.

If you have sensitive skin, carry out a patch test first. Stop using the product if persistent redness, itching, swelling or a burning sensation occurs, and seek advice from a doctor or dermatologist if necessary. Do not use retinol or retinal products on damaged skin, and avoid contact with the eyes and lips.

Frequently asked questions about face serum

Which face serum is suitable for sensitive skin?

Look for a short, clearly presented ingredients list and choose a formula without ingredients that you have not tolerated well in the past. A Centella ampoule or serum containing panthenol may be worth considering for a simple routine, but always check the full ingredients list and carry out a patch test.

Can I use vitamin C, retinol and niacinamide together?

This depends on the complete formulas and your skin’s tolerance. It is better to start with one active serum per routine. Use retinol or retinal as directed, usually in the evening, and combine it with daily sun protection. If you are unsure, alternating them on different evenings is a cautious approach.

How long does a bottle of face serum last?

This varies according to the size and dosage. A 30 ml bottle will generally last longer with daily use than a product used only on specific areas, but exact consumption depends on the number of drops and how often you apply it. Follow the best-before date and the period-after-opening symbol on the packaging.