Retinol and retinal

Retinoid0.1–0.3%

The best-known vitamin A ingredient for smoother-looking skin, used at low levels and introduced gradually.

What it is

Retinol is a form of vitamin A that works gradually over weeks of regular use. It helps the appearance of fine lines, rough texture and uneven tone, so skin looks smoother. Retinal is a more potent relative, one conversion step closer to the active form.

Good for

Fine linesRough textureUneven toneVisible pores

How it works

In the skin, retinol is converted in two steps to retinoic acid, which is thought to speed up surface renewal and support collagen. Because the conversion is gradual, retinol is gentler than prescription retinoids but slower to show results.

Ratings

Evidence

4/5

Controlled trials show visible improvement in fine lines.

Gentleness

2/5

Dryness, flaking and stinging are common at first, so start low.

Formulation difficulty

4/5

Breaks down with oxygen, light and heat, so it needs protection.

Cost

3/5

Stabilised grades and airless packs add cost, as does retinal.

Popularity

5/5

The second most-searched skincare ingredient of 2024.

Pairs and cautions

Pairs well with

In a routine. Pairing in one formula depends on matching pH windows.

Take care with

Strong AHAs, BHAs or low-pH vitamin C in the same productAdds irritation
Benzoyl peroxide in the same productCan oxidise it

Formulations it suits

Serum Cream Eye cream Facial oil

Packaging

Regional considerations

Australia	Topical vitamin A is unscheduled at 1% or less and Schedule 4 above. AICIS recommended a lower cosmetic cap in June 2026, and retinal now needs an AICIS assessment certificate for any consumer use.
European Union	Retinol, retinyl acetate and retinyl palmitate are capped at 0.3% retinol equivalent, or 0.05% in body lotion, with the label line 'Contains Vitamin A. Consider your daily intake before use'. New products have had to comply since 1 November 2025, and all stock must comply by 1 May 2027.
Canada	Retinol and its esters are capped at 1.0% retinol equivalent, or 0.2% in full-body leave-on products. Retinal is capped at 0.05%, or 0.01% in full-body leave-on products.
Climate	Heat, light and air break retinol down, so for hot markets and tropical shipping use airless opaque packs and confirm retinol content after storage at 40 °C.

In the lab

Specifications

Typical use level

0.1–0.3%0525%

pH window

pH 5–72 acid7 neutral10 alkaline

Solubility

Oil-solubleWater-dispersible

Sensitive to

LightHeatOxygenMetal ions

Retinol at 0.1–0.3% in night serums and creams, starting at 0.1% for new users; retinal is stronger and used at 0.05–0.1%.

INCI	Retinol; Retinal
Also known as	Vitamin A, Retinaldehyde, Retinoids
Origin	synthetic

Lab notes

Solubility and phase

Oil phase. Encapsulated grades disperse in the water phase instead.

Stability

Add below 40 °C, ideally under nitrogen, with BHT or tocopherol and a chelator. Encapsulated grades also help. Build in overage and confirm content by HPLC through stability testing.

Regulatory, Australia

Retinol is on the AIIC, and vitamin A above 1% in topical products is Schedule 4, with AICIS (June 2026) recommending a lower cosmetic limit but no scheduling change yet. Since 27 June 2026, retinal needs an AICIS assessment certificate for any consumer use.

Claims to take care with

Keep to cosmetic wording such as 'helps the appearance of fine lines', avoid 'repairs sun damage' or 'safe in pregnancy', and advise daytime sunscreen. EU exports containing retinol must carry 'Contains Vitamin A. Consider your daily intake before use'.