Skincare Layering: The Order That Actually Matters

You’ve heard the rule of thumb: thinnest to thickest. It’s right, mostly. It’s also the kind of rule that breaks the moment you actually have a peptide serum, a vitamin C serum, a retinoid, and a copper peptide cream all sitting on your bathroom shelf at the same time.

This is the longer version of the rule. The basic principle, the exception that matters, the AM vs PM differences, and the “what to combine vs what to alternate” question that comes up the most.

The basic principle: thinnest to thickest

Skincare products fall on a spectrum from watery (essences, toners) to oil-based (heavy creams, occlusive balms). The general principle is to apply in order from thinnest to thickest, because:

The thinner products penetrate faster — they need to land on bare skin, not on top of a layer of cream that slows their absorption.

The thicker products seal the thinner ones — they form a slight barrier that holds the actives against the skin and prevents evaporation.

Apply a thick cream first and then try to layer a watery serum on top? The serum slides off, evaporates, or pools without absorbing. The order matters.

The standard sequence:

1. Cleanse
2. Toner / essence (optional — most people don’t need them)
3. Watery serum (vitamin C, hyaluronic acid)
4. Treatment serum (peptide, retinoid)
5. Eye cream (in the rare case it’s not part of step 6)
6. Moisturiser / cream
7. Face oil (optional)
8. Sunscreen (AM only)

That’s the canonical order. It works for 90% of routines.

The exception: peptides go first

The thinnest-to-thickest rule has one important exception, and it matters because peptides are increasingly common in routines.

Peptide serums often go on first, even before a thinner serum like vitamin C or hyaluronic acid.

The reason: peptides are large molecules (relative to most actives) and they’re sensitive to the surface chemistry of the skin. Putting them on bare, freshly cleansed skin gives them the best surface to land on. If you put a vitamin C serum on first, the slightly acidic environment can interfere with peptide absorption.

The practical sequence, when you have both:

1. Cleanse
2. Pat dry
3. Peptide serum (on bare skin, four to five drops)
4. Wait 30 seconds
5. Vitamin C or other watery serum (if using)
6. Cream
7. Sunscreen (AM)

If you’re only using one serum, this exception doesn’t matter — your serum goes after cleansing, full stop.

AM vs PM differences

Morning and evening routines have different jobs.

Morning is about protection. Antioxidants (vitamin C is the standard), light hydration, sunscreen. The goal is to set the skin up for the day’s UV and pollution exposure.

Evening is about repair-friendly conditions. Peptides, retinoids, copper peptides, anything that’s working with skin’s natural overnight cycle. Heavier creams are fine here because you’re not putting on sunscreen on top.

The order shifts a bit between AM and PM:

AM:

1. Cleanse (or just water rinse)
2. Vitamin C serum
3. Hyaluronic acid (if using)
4. Moisturiser
5. Sunscreen (mandatory, every day)

PM:

1. Cleanse
2. Peptide serum
3. Wait 30 seconds
4. Copper peptide cream (or other moisturiser)
5. LED mask (if using, on dry skin)

Notice that the products differ between AM and PM. That’s intentional. Vitamin C and copper peptides shouldn’t share a routine — they compete in the same application. Splitting them between morning (vitamin C) and evening (copper peptides) is the cleanest way to use both.

Active layering — what to combine vs alternate

This is where most layering questions actually come from. You have two or three actives. Some can layer in the same routine. Some need to alternate by night.

Layer in the same routine

Peptides + niacinamide. Compatible. Niacinamide is gentle and supports the skin barrier; peptides do their signal work without interference. Apply peptides first, niacinamide after.

Peptides + hyaluronic acid. Compatible. Hyaluronic acid is a humectant that pulls moisture into the skin; it doesn’t compete with peptide signalling.

Vitamin C + niacinamide. Compatible (despite a long-running myth). Modern formulations are stable together. The myth came from very old formulations that were unstable; current vitamin C serums layer fine with niacinamide.

Vitamin C + sunscreen. Compatible — and recommended. Vitamin C in the morning routine pairs well with SPF, which is when both should be used.

Alternate by night

Peptides + retinoids. Don’t apply in the same routine. The retinoid environment can degrade some peptide structures, and certain peptides can dampen retinoid penetration. Alternate nights — peptides Monday/Wednesday/Friday, retinoid Tuesday/Thursday/Saturday.

Copper peptides + vitamin C. Don’t apply in the same routine. The copper ion in GHK-Cu and the ascorbic acid in vitamin C will compete. Vitamin C in the morning, copper peptides at night.

Acids (AHA/BHA) + retinoids. Don’t apply in the same routine. Both are aggressive at the surface; combining them invites barrier irritation. Alternate or use them at different times of day.

Acids + vitamin C. Some pairings work, some don’t. Glycolic acid and vitamin C in the same morning routine is generally fine if both are well-tolerated. Salicylic acid and vitamin C is also typically fine. If your skin reacts at all, alternate them.

A simpler rule

If you can’t remember which combinations work, follow this rule: two actives in the same routine, three is pushing it, four is asking for trouble. A routine with cleanser + peptide serum + cream + SPF in the morning, and cleanser + peptide serum + cream + LED mask at night, has plenty of capacity. Adding a fifth or sixth active to either side is usually where things start to compete or skin starts to react.

The Aperture Skin layering guide

Our routine is built to be clean.

AM routine:

1. Cleanse
2. (Optional: vitamin C serum from another brand, if you use one)
3. Moisturiser of your choice
4. Sunscreen

PM routine:

1. Cleanse
2. Peptide Serum 01 — four to five drops, on dry skin
3. Wait 30 seconds
4. Copper Peptide Cream — pea-sized
5. LED mask — 10 minutes, eyes closed (on most nights)

That’s it. Two products plus a mask in the evening, plus whatever you use in the morning. The routine takes 10–12 minutes including the LED session.

If you’re already using a retinoid, alternate it with the peptide serum (peptide on Monday, retinoid on Tuesday, peptide on Wednesday, etc.). If you use vitamin C, keep it in the morning routine — never in the same application as the copper peptide cream.

Further reading

• The Complete Guide to Peptides in Skincare (2026)
• The “Minimal Skincare Routine” Approach: Why Less Often Beats More
• Peptides vs Retinol: Which Should You Choose for Your Skin?

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This article is general information, not personalised skincare advice. Aperture Skin products are cosmetics intended to support the appearance of healthy-looking skin. They are not therapeutic goods and are not intended to treat, cure, or prevent any condition.