Ten Facial Serums: A Comparison by Concern

A serum is a concentrate of active ingredients between toner and cream. The key question is not "which is best" but which concern you are addressing: hydration, brightening, antioxidant defence, acne and pores, or anti-ageing. We have gathered ten popular serums — one for each aim, mixing Korean and Western — and set out what each one does and whom it suits.

01First — which concern

Serums, essences and ampoules are functionally almost the same thing — concentrates of actives; the difference in the names is historical. What matters is this: for a single concern you use one or two products, not everything at once. Hydration — hyaluronic acid, snail mucin. Brightening — arbutin, vitamin C, niacinamide. Antioxidant defence — vitamin C, idebenone. Acne and pores — niacinamide with zinc, tea tree. Anti-ageing — retinal/retinol, peptides. Identify the aim, and the choice among the ten below becomes simple.

02Hydration

Torriden DIVE-IN Low Molecular Hyaluronic Acid. A light serum with hyaluronic acid across five molecular weights — it hydrates at different depths without weighing the skin down. It absorbs quickly and suits all skin types, dehydrated and oily skin especially. A noticeable plumping effect usually within three to seven days.

COSRX Advanced Snail 96 Mucin Power Essence. One of the best-known essences, with 96% snail mucin filtrate — it hydrates, supports the barrier and smooths texture, and helps with post-acne marks. A slightly tacky texture. It suits most skin types, including sensitive skin, and is well tolerated.

03Brightening, even tone and antioxidants

Beauty of Joseon Glow Deep Serum: Rice + Alpha Arbutin. It was this serum that made the brand globally known: rice water lends radiance and hydration, while 2% alpha-arbutin brightens gently, without the instability of pure vitamin C. A watery texture that absorbs almost instantly. For dull skin, post-acne marks and slight unevenness of tone.

Vitamin C (Western, for example Paula's Choice C15 or The Ordinary). Vitamin C is an antioxidant, it brightens, protects against free radicals and supports collagen production. Apply it in the morning, always under sunscreen. It suits dull skin and pigmentation; sensitive skin does better to start with low concentrations and stable forms. Do not combine it in one layer with a high-strength niacinamide.

Mary&May Idebenone + Blackberry Complex Serum. Idebenone is a potent antioxidant, a relative of coenzyme Q10: it protects against free radicals and supports even tone and radiance. Apply it in the morning, under your care and sunscreen — as an alternative or complement to vitamin C for anyone who finds pure vitamin C harsh. For dull skin and the prevention of photoageing. From our editorial team's own experience: we apply it in the morning before cream, sunscreen and make-up; it mattifies slightly and leaves a velvety feel rather than a sheen — convenient under foundation. A calm antioxidant step for every day.

04Acne, pores, oiliness

COSRX Niacinamide 15 (strong). A high concentration of niacinamide (15%) plus zinc PCA — it regulates sebum, refines the pores and brightens post-acne marks. For oily and acne-prone skin, in those already accustomed to niacinamide. For newcomers and sensitive skin, 15% may be too much.

The Ordinary Niacinamide 10% + Zinc 1% (budget-friendly). One of the most affordable and best-known serums: 10% niacinamide and 1% zinc — they control oiliness, smooth texture and reduce the appearance of pores. For oily, combination and acne-prone skin. It can feel slightly tacky; very sensitive skin should introduce it carefully.

05Anti-ageing

Retinal / retinol (for example Beauty of Joseon Retinal or COSRX Retinol 0.5). Vitamin A is the most studied anti-ageing active: it smooths wrinkles, evens texture and speeds up skin renewal. Introduce it gradually, in the evening, from a low concentration, always with sunscreen by day. For mature skin and prevention. Reactive skin — with caution, and not combined with acids on the same evening.

KSECRET Seoul 1988 Retinal Liposome 2% + Black Ginseng. Retinal in a liposomal shell — a form of vitamin A that acts more actively than retinol, but is tolerated more gently thanks to the encapsulation. 2% is a notable concentration, so this is a product for skin already accustomed to vitamin A derivatives. In the evening only, always with sunscreen by day. From our editorial team's own experience: the texture is light, it does not sting or cause redness, and it does not clog the pores — but it works as a full-strength retinal, so barrier care before and after matters (a soothing toner, a rich cream). We use it at night only.

A peptide serum (for example The Ordinary Multi-Peptide). Peptides support collagen production and firmness — a gentler alternative to retinol, suited to sensitive skin too. It pairs well with hyaluronic acid and niacinamide. For early signs of ageing and anyone not yet suited to retinol.

• Applying five serums at once. Two or three at a time is enough, from thin texture to rich. Otherwise the skin does not absorb them and becomes irritated.
• Combining vitamin C and a high-strength niacinamide in one layer. At high concentrations they can reduce each other's effect; better at different times of day.
• Mixing retinol and acids on the same evening. This overloads the skin — alternate them on different days.
• Expecting brightening without sunscreen. Ultraviolet undoes any work on tone and pigmentation.
• Giving up after a week. Hydration shows within days, but brightening and anti-ageing take six to eight weeks of consistent use.

06What to buy for your concern

07Common questions

This material is educational and does not replace a consultation with a dermatologist. Introduce actives (retinal, retinol, acids, vitamin C) gradually and with a patch test.