Retinal (retinaldehyde)

What does retinal do for skin?

Retinal targets the same things as retinol: fine lines around the eyes and mouth, a rough or uneven surface, and skin that has lost its fresh look after years of sun. Clinical studies on sun-aged skin, using silicone casts of the skin surface to measure lines, found it “efficient and well tolerated” for improving those signs.

How is retinal different from retinol?

Vitamin A works in skin like a relay: retinol is handed to retinal, and retinal is handed to retinoic acid, the form that tells cells to renew. Retinal skips the first hand-off, so less has to happen before it can work. A review of cosmetic retinoids concluded that “retinaldehyde, which is fairly well tolerated, seems to be the most efficient cosmeceutical retinoid”, with effects on sun ageing, skin renewal and the bacteria living on skin. For the gentler starting point, see retinol.

Is retinal irritating?

Less than prescription retinoic acid. In a 14-day repeated patch test in 6 people, retinal and retinol both showed low irritation, while retinoic acid was clearly more irritating. In a 44-week study of 355 people, retinoic acid caused redness in 44%, flaking in 35% and burning or itching in 29% in the first 4 weeks; all three were significantly less frequent with retinal. Retinal did cause more flaking than retinol in the short test, so some peeling at the start is possible.

Can you use retinal with acids?

Some products combine them on purpose. In lab and animal tests, a mix of 0.1% retinal with glycolic acid delivered more retinal and retinoic acid into skin than retinal alone, and reduced the size of clogged-pore cysts in hairless mice. That supports tested combination products, not stacking separate strong products yourself; if you use both, alternating nights keeps irritation easier to read.

How long until you notice a difference?

The study summaries cited here do not give a single timeline, and the tolerance study followed people for 44 weeks. Judge retinal over months rather than weeks.

How do you use retinal?

At night, after cleansing, followed by moisturizer. Retinoid studies often start slowly; the retinol arm trial used up to 3 applications a week.

Who should be careful with retinal?

Eye products need extra care. A 2026 review of 89 studies found that vitamin A products used on or around the eyes raised the odds of pain about 6-fold, dryness about 2.7-fold and burning about 2.4-fold. Keep retinal off the eyelids unless a product is made for that area, and patch test first if your skin reacts easily.