Choosing Korean serums: a practical guide to skin types, ingredients and use

Korean serums come in a wide range of textures, formulas and price points. That makes comparing them interesting, but also challenging. A lightweight ampoule with centella is not automatically suitable for dry skin, while a product containing several active ingredients may simply be too much for sensitive skin.

The biggest purchasing mistakes usually come down to three recurring pitfalls:

• Mistaking a marketing name for proven results. Words such as “glow”, “pore minimizing” or “calming” mean very little on their own. Check the full ingredients list.
• Combining too many active ingredients. Using a retinol serum, vitamin C serum, niacinamide serum and exfoliant at the same time can leave your skin feeling uncomfortable.
• Ignoring how often a product should be used. A serum designed for daily use differs from a concentrated ampoule that needs to be introduced gradually.

What should you look for in a facial serum?

1. Choose based on your skin’s needs first, then follow trends

Decide what you want the serum to do. For tight or dry-feeling skin, a hydrating serum containing glycerine, hyaluronic acid, panthenol or beta-glucan is often a better choice. For oily or combination skin, a watery formula may feel more comfortable than a rich product containing lots of oils.

If redness, a troubled-feeling complexion or dehydration is your main concern, look for ingredients such as centella asiatica, madecassoside and panthenol. A centella ampoule is generally easy to introduce into an existing routine, as long as the other products remain gentle.

For a dull complexion or visible discolouration, ingredients such as niacinamide, alpha-arbutin, tranexamic acid and vitamin C derivatives are often recommended. However, brand product descriptions should not be treated as guarantees. According to Beauty Of Joseon’s product information, Glow Deep Serum is intended for an uneven complexion and contains 2% alpha-arbutin and rice bran water. It is still important to check the current packaging.

2. Check the concentration and active ingredients

A percentage makes products easier to compare, but it does not tell you everything about the overall formula. Pay attention to the following:

• Azelaic acid: According to the product information, SKIN1004 Azelaic Acid 10 Ampoule contains 10% azelaic acid, plus panthenol, allantoin and centella. Introduce it gradually and do not apply the product to damaged or irritated skin.
• Retinol and retinal: SKIN1004 Madagascar Centella Retinol 0.2 Boosting Shot Ampoule contains both vitamin A derivatives. Use this product only in the evening, as directed, and start with a low frequency. According to the safety information, use during pregnancy or breastfeeding is only suitable after consulting a healthcare professional.
• Niacinamide and vitamin C derivatives: This combination can be found in various brightening serums. If your skin reacts quickly to new products, it is sensible not to introduce several new active formulas at once.
• Peptides and hyaluronic acid: Poremizing Fresh Ampoule contains several forms of hyaluronic acid and various peptides. The product description links these ingredients to a fresh, lightweight texture and care for visible pores. A serum can make pores look less noticeable, but it cannot make them permanently invisible.

3. Consider the size, texture and routine

A 9 ml bottle is useful for trying out a concentrated product first, but its price per millilitre will differ from that of a 50 or 100 ml ampoule. Also check whether the serum is oily, gel-like or watery. For layering underneath sun cream and make-up, a thin formula is often the most practical.

Usually apply a serum after cleansing and, if desired, toner, followed by a moisturiser. During the day, sun cream with at least SPF 30 should be the final step when the usage instructions indicate that the skin may become more sensitive to sunlight. Test a new product on a small area of skin first and stop using it if irritation persists.

Our recommendations by user profile

Suitable for: Budget-conscious beginners

SKIN1004 Madagascar Centella Daily Skincare Discovery Kit

Why it suits this profile: This set contains five products with a combined volume of 450 ml, including a cleanser, toner, ampoule and cream. It is a practical choice for anyone who wants to learn how to use Korean skincare step by step.

How this product avoids the pitfall

You do not need to buy several large packs containing separate active ingredients straight away. However, check the current INCI list on the packaging for each product.

Key benefit & highlights

A complete introduction to centella products; the toner lists niacinamide and gluconolactone; the ampoule contains hyaluronic acid and ceramides, among other ingredients.

Suitable for: Buyers looking for premium quality

Beauty of Joseon Light On Serum: Centella + Vita C

Why it suits this profile: The 30ml formula combines centella asiatica, 3-O-ethyl ascorbic acid, glycerine and hydrolysed hyaluronic acid in a lightweight serum texture.

How this product avoids the pitfall

The ingredients list makes it clear which form of vitamin C is used. This is more transparent than relying solely on the term brightening serum.

Key benefit & highlights

30 ml volume; centella and a vitamin C derivative; suitable for use in the morning or evening according to the product information.

Suitable for: Targeted use & experienced users

SKIN1004 Madagascar Centella Retinol 0.2 Boosting Shot Ampoule 9ml

Why it suits this profile: This compact product is aimed at users who want to consciously add a retinol serum to their evening routine and can gradually increase how often they use it.

How this product avoids the pitfall

The instructions recommend an adjustment phase of two to three times a week. This helps prevent you from applying it too frequently straight away.

Key benefit & highlights

Contains retinol and retinal; 9 ml size; clear warnings regarding sun sensitivity, the eyes, irritated skin and pregnancy or breastfeeding.

Frequently asked questions about Korean serums

Which serum is suitable for acne-prone skin?

Look at the overall formula rather than just the name “serum for acne-prone skin”. An azelaic acid serum such as SKIN1004 Azelaic Acid 10 Ampoule contains 10% azelaic acid and centella, according to the product information. Start with a small amount and do not use it on damaged skin. For persistent or serious skin concerns, it is wiser to seek advice from a doctor or pharmacist than to combine several active products yourself.

Can you use a hydrating serum every day?

That depends on the ingredients. A simple formula containing glycerine, hyaluronic acid or centella is usually easier to incorporate into a daily routine than a retinol serum or a formula containing exfoliating acids. Always follow the label, test a small amount first and introduce new products one at a time.

How long does an opened facial serum last?

Check the expiry date and the open-jar symbol showing the period of use after opening on the packaging. Close the bottle securely and store the serum in a cool place away from direct sunlight. With vitamin C or retinol products, take extra care to protect them from light and heat, and watch for discolouration. Do not use a product if its smell, colour or texture changes noticeably.