Retinal vs retinol: the one-step difference
Retinaldehyde sits closer to retinoic acid than retinol — here's what that means for results and for your skin's patience.
All retinoids work by converting into retinoic acid, the form your skin can actually use. The difference between them is how many conversion steps that takes. Retinol needs two; retinal (retinaldehyde) needs just one. Fewer steps means faster visible results at a lower percentage.
Gentler than the prescription
Prescription tretinoin is retinoic acid itself — powerful, but often irritating. Retinal lands in a sweet spot: more efficient than retinol, noticeably gentler than tretinoin. Research also credits it with some antibacterial activity, which can help blemish-prone skin.
Starting without the flake
Begin twice a week at night on dry skin, and build up slowly over a month or two. Buffer with moisturiser if needed, never combine it with acids in the same evening, and wear SPF every morning — retinoids make skin more sun-sensitive.