The Ordinary Retinol Guide: Which Strength to Start With

Retinoids are among the most well-evidenced ingredients in skincare for reducing the visible signs of ageing, improving skin texture, and supporting cell turnover. The Ordinary offers six different retinoid products — and the range from beginner-friendly to genuinely strong is significant.

Start at the wrong level and you may experience unnecessary redness, peeling, or irritation. Start too low and you'll take years to see results. This guide explains exactly how The Ordinary's retinoid range works and where to begin.

What retinoids actually do in the skin

Understanding the mechanism helps set realistic expectations — and explains why the tolerance-building period is not optional.

Retinoids work by binding to nuclear receptors (RAR and RXR) inside skin cells, altering gene expression at a fundamental level. When a retinoid binds these receptors, it upregulates genes responsible for collagen production and cellular turnover, and downregulates genes that drive abnormal pigmentation. This is why retinoids have such a broad effect profile compared to most actives — they work upstream, at the gene expression level, rather than targeting individual symptoms.

The practical effects:

Accelerated cell turnover: Retinoids speed up the skin cycle, causing dead surface cells to shed faster. This improves texture, clears congestion, and helps fade post-inflammatory hyperpigmentation. It also drives the "purging" phase in early use — existing congestion rises to the surface more quickly before clearing.
Increased collagen production: With consistent use, retinoids measurably increase dermal collagen density. Clinical studies on tretinoin (prescription-strength retinoic acid) show visible reduction in fine lines within 12 weeks. The Ordinary's Retinol and Granactive Retinoid deliver the same effect, more gradually.
Reduced melanin transfer: Retinoids interfere with the movement of melanosomes from melanocytes to keratinocytes, gradually fading dark spots and improving overall evenness over months of use.
Normalised sebaceous gland activity: Long-term retinoid use modulates sebum production — which is why they are used clinically for acne management, despite not being an immediate spot treatment.

The conversion chain — and why it matters for product choice

Not all retinoids reach the skin's receptors equally:

Retinyl Palmitate → Retinol → Retinaldehyde → Retinoic Acid
                                                      ↑
                               Granactive Retinoid (HPR) binds here directly

Each conversion step involves potency loss — but also reduced irritation. Retinol must convert to retinaldehyde, then to retinoic acid, before it is fully active. Granactive Retinoid skips this chain, binding directly to the same receptors as retinoic acid. The same work happens at the receptor; the intermediary steps that cause irritation are bypassed. This is why HPR delivers meaningful results with significantly less redness and peeling than traditional Retinol.

What to expect: a realistic timeline

Retinoids reward patience. Most people who give up do so in weeks three to five — exactly when the adjustment phase is at its most visible but before the results have begun.

Weeks 1–4 (adjustment): Possible mild dryness, tightness, and flaking — particularly around the nose, mouth, and eyes. Some increase in congestion (purging — see below). Granactive Retinoid users typically experience far less of this than Retinol users.
Weeks 4–8: Skin texture begins visibly improving. Flaking typically settles. Most people at this stage notice smoother skin and a reduction in congestion.
Weeks 8–12: Meaningful visible improvement in skin texture, tone evenness, and early signs of ageing. The clinical evidence for measurable collagen increase begins at around this point.
Months 3–6+: Fine lines, pigmentation, and skin firmness continue improving with ongoing consistent use. Retinoids are a long-term commitment — the results compound over years, not just weeks.

Purging vs. irritation: how to tell the difference

Some skin response in the first weeks of retinoid use is expected. Knowing which type helps you decide whether to push through or pull back.

Normal adjustment (continue)

Mild dryness and flaking — particularly around the nose, mouth, and jawline. The skin cycle is accelerating. Use a plain moisturiser on top.
Mild tightness and sensitivity — typically resolves within 4–6 weeks as the skin builds tolerance.
Increased congestion (purging) — existing blocked pores emptying faster. Looks like a temporary increase in small whiteheads or surface-level spots. This is not an allergic reaction — it resolves within 6–8 weeks. Using Niacinamide in the AM alongside a PM retinoid can help buffer the barrier during this period.

Signs you are overdoing it (reduce frequency)

Burning or stinging that escalates after 10–15 minutes of application rather than staying steady.
Significant peeling in large patches — not mild flaking around the nose and mouth.
Persistent redness that is still visible the following morning.
Itching, swelling, or hive-like reactions — these suggest true irritation or allergy rather than normal adjustment.

If you experience the second list, reduce to once or twice per week and give the skin barrier time to recover before increasing again. True retinoid allergy is rare — over-application is the far more common cause.

DECIEM notes: "Retinoids are not a treatment for acne. Acne-prone skin may experience a temporary increase in acne during the first few weeks of using any form of retinoid including those used in this formulation."

Retinoids vs. Retinol: the terminology explained

The word "retinoid" is an umbrella term for all Vitamin A derivatives used in skincare. Retinol is one type within that family. The Ordinary's range includes two distinct types:

Granactive Retinoid (Hydroxypinacolone Retinoate — HPR)

Granactive Retinoid uses Hydroxypinacolone Retinoate (HPR), a next-generation retinoid ester. Unlike traditional Retinol, HPR does not need to be converted by the skin before it becomes active — it binds directly to retinoid receptors. This means it delivers noticeable results without the significant irritation associated with Retinol.

The result: Granactive Retinoid is highly effective but significantly gentler. It is widely regarded as the best entry point for anyone new to retinoids.

Retinol

Traditional Retinol must be converted in the skin (first to retinaldehyde, then to retinoic acid) before it becomes active. This conversion process is what causes the characteristic irritation — redness, flaking, peeling, and sensitivity — particularly in the early weeks of use while the skin builds tolerance.

Retinol is well-supported by decades of research, but it requires a careful build-up period.

The Ordinary's full retinoid range

Product	Type	Strength	Notes
Granactive Retinoid 2% in Squalane	HPR	2% HPR	Best starting point for retinoid beginners
Granactive Retinoid 5% in Squalane	HPR	5% HPR	Step up from 2%; still no significant irritation
Granactive Retinoid 2% Emulsion	HPR + encapsulated Retinol	2% HPR + Retinol	Creamy format; gentle introduction with combined technology
Retinol 0.2% in Squalane	Pure Retinol	0.2%	Start here if choosing traditional Retinol
Retinol 0.5% in Squalane	Pure Retinol	0.5%	For those who have built tolerance at 0.2%
Retinol 1% in Squalane	Pure Retinol	1%	High strength; experienced retinol users only

All are PM only and all are formulated in Squalane, a lightweight, non-comedogenic carrier oil that suits most skin types.

Where to start

Complete beginners to retinoids

DECIEM's own recommendation — reflected in the Skincare Routine app — is to start with Granactive Retinoid 2% in Squalane.

"Start with something low strength. DECIEM suggests starting with the Granactive Retinoid 2% in Squalane and then moving to the 5%."

Use it two to three nights per week initially. After several weeks with no irritation, increase to every other night, then nightly. Then graduate to the 5% version once your skin is accustomed.

Those who want the traditional retinol pathway

If you want to use pure Retinol (either because you prefer it or because you've already been using retinoids from another brand), start with Retinol 0.2% in Squalane.

"Retinol can cause significant irritation, redness and peeling, especially around the eyes and mouth, in the early stages of treatment while skin builds tolerance. We strongly recommend starting with Retinol 0.2% in Squalane and adjusting to higher strengths as tolerance is built."

Only move to 0.5% once 0.2% causes no redness or peeling. Move to 1% only after sustained tolerance at 0.5%.

Those who want a gentler introduction with a cream texture

Granactive Retinoid 2% Emulsion combines HPR with encapsulated Retinol in a hydrating emulsion format. It's softer on the skin than the anhydrous Squalane versions and a good option for those with drier skin who find oils more comfortable than serums.

Important: what retinoids won't do

"Retinoids are not a treatment for acne. Acne-prone skin may experience a temporary increase in acne during the first few weeks of using any form of retinoid."

The initial purging phase — where existing congestion comes to the surface more quickly — can look like a breakout. This is temporary and expected. It is not an allergic reaction and is not a sign that retinoids aren't working for you.

Retinoids and pregnancy

"When pregnant or breastfeeding, it is recommended to avoid any skincare products containing retinoids."

This applies to all retinoid types, including Granactive Retinoid. If you are pregnant or breastfeeding, discontinue retinoid use and speak to your healthcare provider.

The morning after: SPF is non-negotiable

Retinoids increase the skin's sensitivity to UV radiation. Every morning after using a retinoid the night before, broad-spectrum SPF 30+ is required — not optional. This is not just a precaution: UV exposure on retinoid-sensitised skin will actively undo the improvements you are working toward, particularly on pigmentation. The Skincare Routine app places your SPF in the correct position at the end of your AM routine automatically.

The conflicts you must know

Retinoids are probably the most conflict-prone product category in any skincare routine. They must not be used in the same session as:

Direct acids (AHAs and BHAs)

This is the most commonly broken rule. Do not use retinoids in the same session as:

AHA 30% + BHA 2% Peeling Solution
Glycolic Acid 7% Toning Solution
Lactic Acid 5% or 10%
Mandelic Acid 10% + HA
Salicylic Acid 2% Solution

Retinoids and direct acids together will over-exfoliate the skin, damage the barrier, and cause redness and sensitivity. The correct approach is to alternate them: use acids on different nights from your retinoid.

Copper Peptides

Buffet + Copper Peptides 1% (and any copper peptide product) should not be used in the same routine as retinoids. Use them on separate evenings.

Pure Vitamin C

As covered in the Vitamin C guide, pure L-Ascorbic Acid and retinoids conflict. Keep retinoids PM-only and avoid layering with Vitamin C in the same session.

Other retinoids

Don't stack multiple retinoid products. The app notes: "It is generally not recommended to use more than one retinoid product at a time. It is best to finish one product before starting another."

Using the app to manage your retinoid routine

The Skincare Routine app makes managing retinoids much simpler. All six retinoid products are pre-loaded and pre-configured:

They are automatically placed in the PM routine.
All conflict relationships (with acids, copper peptides, Vitamin C, and other retinoids) are built in.
During your routine, if you tick your retinoid product, any conflicting acid or peptide products are immediately flagged with a crossed-out red checkbox.
You can use the scheduling feature to set your retinoid to appear only on certain nights (e.g. Monday, Wednesday, Friday) and your acids on alternating nights — the app will manage this automatically.
The 6-day usage bar visible in the routine view shows you at a glance when you last used each retinoid, making it easy to manage alternating treatments without keeping mental notes.

The app is available on iOS and Android at skincareroutine.app.

Summary: The Ordinary retinoid ladder

Start here (complete beginner):
  Granactive Retinoid 2% in Squalane (2–3x per week)
    ↓
  Granactive Retinoid 5% in Squalane
    ↓
  Retinol 0.2% in Squalane (if choosing traditional retinol pathway)
    ↓
  Retinol 0.5% in Squalane
    ↓
  Retinol 1% in Squalane (experienced users only)

Key rules to remember:

PM only. Always.
Always follow with SPF the next morning. Retinoids increase photosensitivity.
Never combine with acids in the same routine. Alternate instead.
Build tolerance slowly. Start 2–3 nights per week and increase gradually.
Expect a short purging period when starting for the first time.