What it does
The strongest retinoid available without a prescription. Retinal sits one conversion step closer to retinoic acid than retinol, so it works faster while staying gentler than prescription tretinoin.
Best for
Experienced retinoid users who want more than retinol without a prescription, and anyone chasing faster results on lines and tone.
What is retinaldehyde?
Retinaldehyde, usually shortened to retinal, is the strongest retinoid you can buy without a prescription. It sits one conversion step from retinoic acid, the active form, while retinol sits two steps away, so retinal works faster at comparable gentleness.
That single-step difference is the entire story of why retinal commands a premium over retinol.
Is retinal stronger than retinol?
Yes. Retinal converts to retinoic acid in one step instead of retinol's two, so more active survives to work in the skin.
Clinical evidence reviews place retinaldehyde between retinol and prescription retinoic acid in potency, with efficacy on photoaging and good tolerability.
For the full comparison, see our Retinal vs Retinol guide. Retinal follows the same rules as every retinoid: use at night, start slowly, and wear sunscreen daily.
Who should use retinal?
Retinal suits experienced retinoid users who have outgrown retinol and want faster results on the look of lines and tone without a prescription. True beginners and very sensitive skin should start with retinol or bakuchiol first.
Evidence
Clinical evidence reviews of topical retinoids place retinaldehyde between retinol and prescription retinoic acid in potency, with efficacy on photoaging and good tolerability.
Read the source: Advances in Therapy: use of retinoids in topical antiaging treatments, focused review of clinical evidence (2022) ->