Retinoids (retinol)

Benzoyl peroxide can oxidise and deactivate many retinoids (adapalene is a noted exception). Keep them in separate routines rather than the same layer.

Often kept in separate routines to limit how many strong actives land at once — copper peptide one part of the day, retinoid the other. A comfort preference, not a hard chemical rule.

A classic AM/PM split — vitamin C in the morning, retinoid at night — mostly for tolerability and because vitamin C suits daytime antioxidant use.

Layering a retinoid with an exfoliating acid raises the chance of visible irritation for many people; alternating on different nights is common.

As with AHAs, combining a retinoid and BHA can be a lot for the skin barrier — introduce gradually or alternate.

Usually an either/or rather than a stack. Bakuchiol is chosen as a gentler alternative to a retinoid, so using both mostly adds irritation risk without a demonstrated additive benefit. If you are tolerating a retinoid well, bakuchiol has little to add; if you are not, it is the substitute.

Compatible in principle — tranexamic acid is not pH-dependent and does not deactivate a retinoid — but it is another active on skin that is already adjusting. Introduce them weeks apart rather than together, and split across AM/PM if either stings.

Niacinamide is often paired with retinoids to support a comfortable feel.

Hyaluronic acid pairs well with retinoids and can help the skin feel more comfortable.

Generally compatible; some alternate to manage overall load.

Not layered together, but daily SPF is the essential companion to any retinoid routine.

The standard pairing for getting through retinisation. Ceramides support the barrier the retinoid is temporarily stressing; applying a ceramide moisturiser before or after the retinoid is the buffering approach dermatologists recommend.

Squalane is an inert emollient, not an active, so it does not compete with a retinoid. It is one of the standard ways to buffer one: applied before or after, it softens the early dryness without switching the retinoid off.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.

We have not reviewed this combination. That means we have nothing to report about it — not that it is safe, and not that it is a problem. Treat it as an open question: introduce one new product at a time and patch-test, as you would with any unfamiliar pairing.