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Retinaldehyde
Also known as: Retinaldehyde, Vitamin A Aldehyde
Retinal (retinaldehyde) is a vitamin A derivative used in evening routines for smoother-looking, renewed skin by morning. It works gradually: start twice a week, buffer with moisturizer, and wear SPF daily.
Cell-turnover agent
Accelerates epidermal renewal.
Accelerates cell turnover and stimulates collagen for fine line reduction.
Smooths roughness and refines pore appearance over 8-12 weeks.
With Glycolic Acid · IRRITATION_STACKHIGH
Retinaldehyde accelerates turnover; layering direct AHAs the same night doubles irritation risk and can compromise the barrier.
With Salicylic Acid · IRRITATION_STACKHIGH
Retinoid + BHA same-night layering is a common purge trigger; alternate nights instead.
With Lactic Acid · IRRITATION_STACKHIGH
Alternate nights — same-application stacking raises irritation without added benefit.
With Ascorbic Acid · PH_MISMATCHMEDIUM
Vitamin C prefers low pH, retinal prefers near-neutral: split AM (vitamin C) / PM (retinal).
With Benzoyl Peroxide · OXIDATIONHIGH
Benzoyl peroxide oxidizes most retinoids on contact; use at opposite ends of the day.