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Spring 2026 · The Beauty Column

Roundup No. 02 · Serums

Serums, Sorted by What They Do

Forget the dropper theatre. Here is each serum type judged on the one job it is good at.

Published 9 March 2026 · About 7 minutes

The serum is the most profitable object in skincare: a small bottle of concentrated actives, priced as though each drop were distilled by hand. Some serums earn that position. Many are watery moisturisers in elegant glass. The trick is to stop shopping by brand mood and start shopping by job description. Ask what problem you want solved, find the ingredient with evidence for that problem, then pick the gentlest, best-packaged version you can afford. Below is the shortlist, arranged as a numbered roundup with a verdict for each.

The roundup

  1. Retinoids (retinol, retinal, adapalene)

    The most studied topical for fine lines, texture and breakouts. Retinoic acid research dates back to work by Dr Albert Kligman in the 1960s and 70s. Adapalene 0.1% is available over the counter in the US since the FDA approved the switch in 2016. Start twice a week; expect dryness at first.

    Worth it

  2. Vitamin C (L-ascorbic acid and derivatives)

    An antioxidant that supports sun protection and can soften dullness and pigmentation. Pure L-ascorbic acid at 10–20% is the benchmark but oxidises quickly: buy small, opaque, airtight bottles and discard when it turns deep orange.

    Worth it

  3. Niacinamide

    A form of vitamin B3 that helps with redness, oil and barrier function. The evidence supports 2–5%; the 10–20% bottles that went viral offer little extra and irritate some skins. A quiet workhorse, not a headline act.

    Worth it

  4. Azelaic acid

    Prescribed at 15–20% for rosacea and acne, and gentle enough for many sensitive skins at 10% in cosmetic formulas. Helps with redness, breakouts and post-blemish marks. Our pick for the season's most underrated active.

    Worth it

  5. Hyaluronic acid

    A humectant that draws water into the skin. Pleasant and useful, but it is a moisturiser ingredient, not a transformation. If your moisturiser already contains glycerin, a separate hyaluronic serum is optional.

    Situational

  6. Peptide serums

    Signal peptides such as palmitoyl pentapeptide-4 show promising but modest results in small studies. Fine if you enjoy them and they sit comfortably under sunscreen. Not a substitute for a retinoid.

    Situational

  7. "Exosome" and growth-factor serums

    The newest luxury pitch. The science of cosmetic exosomes is early, regulation is inconsistent, and prices are high. Check back in two or three seasons.

    Skip for now
A serum should have a job title. If the label only offers adjectives, it is a moisturiser in a smaller bottle.
3D render of a single amber dropper serum bottle with a soft glow, isolated on a dark grey background
Opaque, airtight packaging matters more for vitamin C than any marketing claim.

Matching serum to concern

ConcernFirst choiceGentler alternativeUse when
Fine lines, textureRetinoidPeptide serumEvening
Dullness, uneven toneVitamin CAzelaic acidMorning
Redness, oilinessNiacinamide 2–5%Azelaic acidMorning or evening
BreakoutsAdapaleneAzelaic acidEvening
DehydrationHyaluronic acidGlycerin-rich moisturiserAny time, on damp skin

How many serums is too many?

Two, for most people: an antioxidant in the morning beneath sunscreen and a retinoid at night. Add a third only when you have a specific, persistent concern the first two do not address. Every extra layer is another chance for irritation and another variable to blame when things go wrong. The British Association of Dermatologists and the American Academy of Dermatology both emphasise patch-testing new products and introducing them one at a time, which is impossible if you buy five at once.

Order matters less than the internet suggests. A practical rule is thinnest to thickest, with sunscreen last in the morning. Pregnant or breastfeeding readers should avoid retinoids and check other actives with a doctor or pharmacist.

The verdict

If you buy a single serum this spring, make it a well-packaged vitamin C for the morning, or start a retinoid at night if ageing and texture are your priority. Azelaic acid is the quiet star for sensitive and blemish-prone skin. Everything else is optional, and a good share of it is decoration. Next, the product that matters more than any serum: sunscreen.

General information only. Not medical advice.