Retinol vs Retinal: What's the Difference and Which One Should You Use?

You've probably seen both retinol and retinal on product labels and wondered — are they the same thing? They're related, but they're not equal. Here's what you need to know.

What is Vitamin A in Skincare?

Retinol and retinal are both forms of Vitamin A — one of the most well-researched anti-aging ingredients in skincare. They both ultimately convert to retinoic acid in the skin, which is behind vitamin A's reputation for smoother-looking skin, softer-looking fine lines and a more even-looking tone.

Retinol

Retinol has to go through two conversion steps before becoming retinoic acid. This makes it gentler and slower to show results — ideal for beginners or those with sensitive skin. Most over-the-counter retinol products range from 0.025% to 1%.

Try: Dr.Althea 0.1% Gentle Retinol Serum — a great entry-level option.

Retinal (Retinaldehyde)

Retinal is one conversion step away from retinoic acid, so it tends to work faster than retinol and is more likely to irritate. It is still sold without a prescription. It's the gold standard of over-the-counter vitamin A in K-beauty.

Try: Seoul 1988 Retinal Liposome Serum or the Beauty of Joseon Revive Eye Patch with retinal + ginseng.

Which Should You Choose?

• Retinol — if you're new to vitamin A or have sensitive skin
• Retinal — if you want faster results and your skin can tolerate actives

How to Introduce Vitamin A Safely

Start 1–2 nights per week, apply to dry skin after cleansing, and always use SPF the next morning. Expect some initial dryness or flaking — this is normal and settles within a few weeks.