How to Do Skin Cycling Correctly (Without Wrecking Your Barrier)

Skin cycling is the most useful trend of the last few years, largely because it is not a product. It is a four-night rota: exfoliate, retinoid, recover, recover. The value is in the recovery nights, which is exactly the part people delete first.

The four nights

• Night one — exfoliate. One acid, one application. An glycolic acid or lactic acid product for texture and dullness; a BHA if you are congested.
• Night two — retinoid. Your usual strength, on dry skin, moisturiser after.
• Nights three and four — recover. Cleanse, hydrate, seal. Hyaluronic acid under an emollient, ceramides in the moisturiser, nothing that tingles.

Then repeat. SPF every morning, regardless of which night you are on.

Why the recovery nights matter

Exfoliants and retinoids both increase cell turnover and both temporarily disturb the barrier. The barrier repairs itself over roughly two to three days. A rota that gives it those days is the whole mechanism. Without them, you are running two disruptive actives on an unrepaired surface and calling it a routine.

The tell-tale signs you have skipped too many recovery nights: tightness after cleansing, stinging from products that used to be fine, a shiny, over-smooth look that photographs well and feels tender.

Common ways it goes wrong

• Stacking a scrub on top of the acid night because it "does not count".
• Using a strong acid toner every day and cycling only the retinoid.
• Treating recovery nights as nothing nights and skipping moisturiser.
• Starting cycling on already-irritated skin. Repair first, then schedule.

If you use a prescription retinoid

Follow the prescriber's instructions over any internet rota. Cycling was designed around cosmetic retinoids; prescription tretinoin and adapalene have their own escalation patterns, and adding acids to them is a decision to make with the person who prescribed it.

Cosmetic information only. Persistent irritation, burning or peeling that does not settle within a few days of stopping actives is worth professional advice.