Oiliness and sebum

Skin that turns shiny quickly because it produces a lot of sebum.

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What it is: Skin producing a lot of sebum and looking shiny. It overlaps with pores and acne, but sebum output is something you can measure on its own.
Why it happens: Hormones largely set how active the sebaceous glands are. Season and temperature matter, and so does the rebound after washing too often.
Where to start: Making sebum removal the goal usually backfires. Over-cleansing strips the barrier, and that comes back around as more shine.

There are no numbers and no citations in this box. What has been established, and how far, is below.

This overlaps with pores and acne, but it sits apart for one reason: it has a measurement of its own. Sebum comes out as a number on a sebumeter — unlike pore size or lesion counts, an instrument reads it directly.

That makes this one of the few concerns on this site that gets checked with numbers. But two things have to be kept apart.

Sebum went down — measured by instrument
It feels less greasy — reported by the person

Those do not always move together. An ingredient that absorbs surface oil reduces shine without reducing how much sebum is produced.

And producing a lot of sebum is not in itself a disease. There is a longstanding observation that oily skin tends to wrinkle later. It is better not to assume that less is always better.

Evidence level

Moderate evidenceAntioxidant

Niacinamide

In a 12-week split-face study of 50 people, 5% niacinamide reduced fine lines, yellowing, red blotchiness and pigmented spots. The control was not nothing but the same moisturiser, and the manufacturer paid for the trial.

Moderate evidenceAcid

Salicylic acid

Salicylic Acid

Most acne trials used 30% peels performed in a clinic. What Korea allows as an acne functional claim is 0.5%, and only in rinse-off cleansers. There is a sixtyfold gap between those two numbers.

Moderate evidenceAntioxidant

EGCG (green tea polyphenol)

Epigallocatechin Gallate

In a trial splitting 90 people into three arms over four weeks, sebum fell significantly in all three (P < .01). But all three received a moisturising cream with an active in it — there was no arm that got the base alone. For acne, there is one 8-week randomised split-face trial.

Moderate evidenceOther

Carnitine (l-carnitine)

Carnitine

In a four-week trial splitting 90 people into three arms, 2% l-carnitine cream significantly reduced sebum (P < .01). But it took the longest to control oil, and the arm combining it with EGCG beat it significantly (P = .009). And there was no arm that got the base alone.

Moderate evidenceOther

Lactoferrin

There are two placebo-controlled randomised trials, and the endpoint is a lesion count. Mechanically, that passes this site's conditions for 'strong evidence'. But the large trial (168 people) put three things in one capsule — lactoferrin, vitamin E and zinc — and the trial that isolated lactoferrin (36 people) is the smallest. In that 36-person trial, inflammatory lesions fell 38.6% against placebo, total lesions 23.1%, and sebum 31.1%. The conditions count designs; they cannot count what was inside the capsule. So we lowered the badge by hand.

Early researchAntioxidant

Resveratrol

2025 brought the first study to test this as a sole active. A 134-person, 8-week placebo-controlled trial split oral and topical into four combinations, and wrinkle scores fell significantly only in the arm that was active on both. Meanwhile sebum rose significantly in the arms applying the active cream. Nothing else differed.

Medicines used for this concern

Medicines are not listed alongside cosmetic ingredients. Dosage and whether a prescription is needed are settled in consultation.

Strong evidenceSpironolactonePrescription only
Moderate evidenceIsotretinoinPrescription only

Clinical procedures related to this concern

Procedures are not listed alongside topical ingredients. They are not something you use at home.

Moderate evidenceChemical peelDevice-based
Moderate evidencePhotodynamic therapy (PDT)Device-based