Abstract
Most people choose a retinol by strength. Strength is not the variable that decides the outcome.
Duration is. A retinoid works by influencing cell behaviour over months, and that only happens if application continues. The percentage that irritates your skin into stopping at week five delivers nothing, regardless of how it performed in a trial.
Which makes the useful question: what is the strongest formulation you will still be using at month six? The best retinol is the one you keep using, and this is not a softening of the science. It is the practical consequence of it.
Three Things That Matter More Than Percentage
Whether it is encapsulated. Unencapsulated retinol hits the skin all at once. Encapsulation releases it gradually, which lowers the irritation peak while maintaining exposure over time. The delivery system changes the tolerability profile without changing the active.
What it is buffered with. A retinoid in a base that supports the barrier behaves differently from the same retinoid in a bare vehicle. Retinisation, the adjustment period of dryness and flaking, is largely a barrier event. Formulating for it reduces the dropout rate.
Whether it is paired. Bakuchiol is frequently sold as a retinol alternative for people who cannot tolerate retinoids. The more interesting finding is that it is not a weaker substitute. In published work it has matched retinol on several measures with less irritation, and it appears to stabilise retinol when combined. Combination formulations are not a compromise position. Bakuchiol is not a weaker retinol.
How to Introduce It Without Losing the First Month
Retinol failures cluster in the first six weeks, and are largely avoidable.
Start twice weekly. Not nightly. Build to alternate nights over four to six weeks, then to nightly only if the skin is comfortable.
Apply to dry skin. Damp skin increases penetration and increases irritation with it.
Do not layer with acids on the same night. Exfoliating acids and a retinoid together is a common cause of a compromised barrier presenting as sensitivity.
Support the barrier alongside it. A niacinamide-led serum is prescribed with a retinoid, not instead of one.
SPF the following morning, without exception. Retinoids increase photosensitivity. Using one without daily SPF in a Queensland summer can undo the benefit faster than the retinoid delivers it.
What to Expect
Weeks 1 to 4: possible dryness and light flaking. This is retinisation, not a reaction, provided it is mild and settling.
Weeks 4 to 12: texture and tone begin to shift.
Month 3 onward: the changes retinoids are actually prescribed for. This is the point most people never reach, and the reason tolerability matters more than strength.
When Not to Use One
Retinoids are not recommended in pregnancy or while breastfeeding. This is a firm position, not a cautious one. Bakuchiol is the evidence-supported alternative in that window, and we have written separately on what to use instead of vitamin A while pregnant.
If your barrier is currently compromised, treat that first. Adding a retinoid to inflamed skin extends the recovery rather than accelerating the result.
What We Prescribe
Aliangé Ultimate A Night Cream ($130, 50ml) sits at step 3, the final step, of the PM Protocol. Micro-encapsulated retinol paired with bakuchiol in a barrier-supporting base, formulated for tolerability over months rather than for a number on the label.
It is prescribed with Biocinamide Serum ($90, 50ml) for barrier support and Day Cream SPF 15 ($90, 50ml) the following morning. Those two are not accessories to the retinoid. They are the conditions under which it can be used long enough to matter.
Written by Dr Alison Jamieson — MBBS, FRACGP, Dip Derm, cosmetic physician, with over 40 years treating Australian skin.
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