Skincare order: does serum go before or after moisturiser?

Serum goes before moisturiser. Always, in every routine, morning and night. If you take nothing else from this page, take that, because the mistake runs the other way more often than you would think, and it quietly wastes the most expensive product on your shelf.

What is worth having is the reason, because once you understand it you never have to memorise another sequence again. The rule is thin to thick, and it is not a beauty-counter slogan. It follows from two properties of the skin barrier that are measurable.

The barrier is selective, and size decides

Your skin is not a sponge. The outermost layer, the stratum corneum, is a dense arrangement of flattened cells set in lipid, built to keep water in and foreign matter out. Only small molecules cross it with any ease. The working threshold most often cited is around 500 Daltons: below it a compound stands a reasonable chance of penetrating, above it the compound largely stays on the surface.¹

Now look at what is actually in each of your products. A serum is water-based and carries the small, active molecules. Niacinamide, for instance, is a small, water-soluble vitamin, which is exactly why it can get where it needs to go.² A moisturiser is an emulsion. It carries larger material by design: the lipids, butters and esters that fill the gaps between skin cells and sit on the surface. Those are not trying to penetrate. They are trying to stay put.

So the order writes itself. Put the small molecules on clean skin first, while nothing is in their way. Put the large ones on top, where their job is anyway.

Why viscosity matters as much as size

The second property is the one people underestimate. A moisturiser is not just heavier, it is designed to reduce how much moves across the skin surface at all.

Moisturisers work through three kinds of ingredient. Humectants such as glycerin and hyaluronic acid attract water into the upper layers, from the skin beneath and from a humid atmosphere. Emollients, mostly fatty acids and lipids, fill the gaps between skin cells and make the surface smooth and flexible. Occlusives create a hydrophobic film over the top to stop water escaping, and they are extremely effective at it: petrolatum at even a low concentration reduces transepidermal water loss by more than 98%.³

Read that number again and think about what it means for layering. An occlusive film that good at holding water in is also a film that anything applied afterwards has to fight through. Put the moisturiser on first and your serum is no longer meeting skin. It is meeting a barrier you have just built on top of your own.

The last thing you apply decides how much of everything underneath it stays where you put it. That is why occlusives go last, and why the order is not a preference.

Why occlusives go last, and what that means at the basin

Occlusion is not only about holding water in. Hydrating the stratum corneum makes it more permeable, so a well-hydrated surface actually helps whatever is beneath it work. That is the useful, compounding version of the sequence: treatment first, then the layer that keeps the treatment in contact with skin for hours instead of minutes.³⁴

There is a practical corollary. Apply your serum to skin that is still slightly damp. Humectants need water to draw on, and they will pull it from wherever it is available, including from your own deeper layers if the air is dry.⁴ Damp skin gives them something better to work with.

The barrier is not static either. Measured through the day, transepidermal water loss and stratum corneum hydration both vary on a daily rhythm, with water leaving the skin more freely in the evening than in the morning.⁵ That is one reason the same two products can feel different at 7am and at 11pm, and one more reason to put the sealing layer last at night.

Where the eye serum fits

Between the two. The skin around the eye is among the thinnest on the body and it creases with every blink, so it takes its own formula rather than whatever is left on your fingers after the cheeks. Apply it after the face serum and before the moisturiser, on the orbital bone rather than the lid, and let it settle before anything goes over it.

So the sequence at the basin is: clean skin, face serum, eye serum, moisturiser. Thirty seconds or so between steps, or simply until the previous layer no longer feels wet. You do not need to time it.

The honest caveat

No randomised trial has compared application orders head to head and measured the outcome. What exists is the penetration science, the barrier physiology and a great deal of formulation logic, all of which point the same way. Anyone citing a specific clinical trial that proves serum-before-moisturiser is citing something that does not exist.¹³

The practical honesty is this. Getting the order right matters less than doing the routine at all. A man who applies his products in the wrong order every day will still be in better shape in six months than a man who gets the order perfect twice a week. The sequence is free to fix, so fix it. Then stop thinking about it.

How this plays out with our own two

Our Hydrating Face Serum is water-based and carries the small actives: niacinamide, hyaluronic acid and Chlorella vulgaris extract from our own microalgae, grown in closed photobioreactors in Iceland and Barcelona rather than harvested from the sea, then cold-pressed and stabilised. It goes first.

Our Mattifying Moisturiser is the layer that seals it. It is a moisturiser first: deep hydration that holds all day, suitable for every skin type, with oil balanced and pores refined. The matte finish is a consequence of how it is built, not the whole point of it. It goes last.

Both are fragrance-free. In their consumer trials, 96% of the 50 men testing the serum said its texture felt smoother at four weeks and 98% said their skin appeared rehydrated, ADSL 2025-0056. Among the 53 men testing the moisturiser, 87% said their skin appeared rehydrated at four weeks and 83% said their skin did not feel irritated, ADSL 2025-0057.

The pair is sold together as The Daily Essentials, and in a separate trial of 50 men using them in that order, 90% said their skin felt deeply hydrated at four weeks and 90% said it stayed moisturised all day, ADSL 2025-0162. That is what the correct order buys you: not a different product, the same products doing more of what they were built to do.

If you want the ingredient reasoning behind those formulas, we have written about marine actives for men and about what niacinamide does and does not do for dark circles.

Written by

Freddie Sheridan

I started YCODE because most skincare was never designed for men’s skin. What I write here is what the formulators taught me, and what the trials actually found.

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