At a Glance Retinaldehyde (retinal) is the intermediate form of vitamin A that sits between retinol and retinoic acid (tretinoin) in the retinoid conversion pathway — one enzymatic step away from the active form the skin actually uses. This position in the pathway gives it a clinical profile…
In the full monograph
- What it is, and how it works
- What the evidence shows — randomized trials, observational data, animal studies, graded and cited
- Dose, form, and timing
- What to expect, and how soon
- Who should be careful, and what to check first
- The verdict
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