Retinal (Retinaldehyde)

INCI: Retinaldehyde
Category: Retinoid / Vitamin A Derivative / Cell-Renewal Active
Used in: Serums, night creams, treatment moisturisers
Typical Usage Level (Topical): 0.01–0.1%

What This Ingredient Does

Retinal (retinaldehyde) sits one conversion step ahead of retinol in the vitamin A pathway  it needs only a single enzymatic conversion to become retinoic acid, compared to retinol's two-step process. This makes it significantly faster-acting than retinol while remaining gentler than prescription retinoic acid. It activates retinoid receptors more efficiently, delivering measurable improvements in cell turnover, collagen stimulation, and pigmentation reduction in a shorter time frame. Retinal also has direct antimicrobial properties against C. acnes, making it relevant for acne-prone skin.

Key Benefits

• Converts to retinoic acid faster than retinol results visible sooner
• Stimulates collagen and improves fine lines, texture, and pigmentation
• Direct antibacterial activity against acne-causing bacteria
• Lower irritation potential than prescription tretinoin 
• Suitable for those who found retinol too slow or prescription retinoids too harsh

Who It's Best For

• Those who have already tolerated retinol and want to step up efficacy
• Acne-prone skin with concurrent signs of ageing or pigmentation
• Not recommended during pregnancy or breastfeeding
• Darker skin tones should introduce slowly with SPF

Clinical Note by Dr. Su

Retinal is the retinoid I most often recommend for patients who want meaningful results without a prescription. It punches closer to tretinoin than most people realise, but with a manageable adjustment phase. Do not underestimate it. Start low, use SPF daily, and give it 8–12 weeks.

References

• Saliou C, et al. (2002). Retinaldehyde and related compounds in cutaneous biology. Skin Pharmacology and Physiology. PMID: 12218289
• Dhaliwal S, et al. (2019). Prospective, randomized, double-blind assessment of topical bakuchiol and retinol for facial photoageing. British Journal of Dermatology. PMID: 30272582 (includes retinaldehyde comparator data)