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Korean serums are popular thanks to their lightweight textures, wide choice of active ingredients and step-by-step routines. However, an attractive label does not guarantee that a facial serum is right for your skin or your goals. If you focus only on terms such as “glow”, “lifting” or “pore tightening”, you may end up with a product that is too strong, causes irritation quickly or barely gets used.
This buying guide helps you compare Korean skincare serums based on ingredients, concentrations, usage and your skin’s needs.
A 10% niacinamide serum or a vitamin C serum with 23% may sound appealing, but a higher concentration can be less comfortable for some skin types. This is particularly true for sensitive skin, so it is sensible to start gradually, use a small amount and carry out a patch test first.
Also consider the formula as a whole. Alongside the main ingredient, a serum may contain exfoliating ingredients, retinol, fragrance or alcohol. So look beyond one prominent percentage on the front of the packaging.
A hyaluronic acid serum attracts moisture, but dry skin often also needs an occlusive moisturiser to help retain that moisture. Ingredients such as glycerine, panthenol, ceramides, beta-glucan and squalane can complement the formula. A watery texture may feel pleasant, but on its own it says nothing about how long that comfort will last.
Using a serum for dark spots, a retinol product and an exfoliant in the same routine can be too intense. High-concentration vitamin C, retinal and salicylic acid in particular should be introduced gradually. Wear sunscreen during the day when advised in the product information, and always follow the instructions on the packaging.
Start by choosing one main goal:
A serum for dark spots is not a substitute for sun protection. Pigmentation can become more visible due to UV exposure. Claims about reducing dark spots come from product marketing, so pay particular attention to the ingredients list and usage instructions.
For a serum for sensitive skin, a short ingredients list, fragrance-free formula and gradual introduction are useful things to look for. That does not mean every fragrance-free product will automatically suit everyone. Check for known allergies and stop using the product if irritation persists.
Also pay attention to product claims. “Dermatologically tested”, “hypoallergenic”, “vegan” and “cruelty-free” do not all mean the same thing. Check the official product information and the packaging for the current formulation.
Vitamin C is sensitive to light, heat and air. For COSRX Vitamin C23, the product information states that the serum should be stored in a cool place and preferably used within two months of opening. According to the supplied information, a retinal product should only be used in the evening and every other evening when you first start using it.
Always check:
Why it suits this profile: The simple formula with sodium hyaluronate, panthenol and allantoin is easy to understand for anyone starting out with a hydrating serum.
The product information lists a short ingredients list and recommends using 2 to 3 drops, so you do not immediately combine several potent active ingredients.
100 ml; contains sodium hyaluronate, panthenol and allantoin according to the product information.
Why it suits this profile: This serum targets dull or uneven-looking skin with rice bran water and 2% alpha-arbutin, alongside niacinamide and panthenol.
The formula makes it clear which ingredients do the work, rather than relying solely on a general glow promise.
30 ml; alcohol-free, fragrance-free and vegan according to the product information.
Why it suits this profile: If you want to use a vitamin C serum deliberately, this formula clearly specifies its 23% ascorbic acid content.
The product information recommends patch testing, cool storage, use within two months of opening and caution when combining it with retinol and other potent active ingredients.
23% ascorbic acid; also contains panthenol, squalane and sodium hyaluronate according to the ingredients list.
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.
Look for a hydrating serum containing hyaluronic acid, glycerine, panthenol or beta-glucan. Apply it to slightly damp skin, then use a moisturiser. This helps reduce the risk of your skin feeling tight after application.
It depends on the overall formula and how sensitive your skin is. With a high-concentration vitamin C serum, it is practical to introduce one product gradually first. You can use active ingredients at different times of day if necessary, and stop if irritation occurs.
This varies depending on the volume and dosage. A 30 ml bottle used daily with a few drops at a time will often last from several weeks to several months. Always check the period after opening. With sensitive formulas such as vitamin C, the recommended period of use after opening may be shorter than the general shelf life of an unopened product.
