Retinaldehyde (Retinal)

Retinaldehyde — often shortened to retinal — is the vitamin A form that sits one conversion step from retinoic acid, the form retinoid receptors respond to.

How it works

Where retinol needs two enzymatic conversions and esters like retinyl palmitate need three, retinal needs only one. Research associates it with faster visible results than retinol at comparable tolerability — which is why it anchors stronger night treatments.

Retinisation

The adjustment period applies as with all retinoids: dryness and flaking for the first weeks are expected. Introduce gradually and buffer with moisturiser if needed.

Light sensitivity

Evening use only; retinal degrades in UV and treated skin is more UV-sensitive. Daily broad-spectrum SPF is required alongside it.

Pregnancy and breastfeeding

Not suitable, in line with standard guidance for all topical retinoids.