Retinal is one of the most talked-about ingredients in skincare, and one of the most misunderstood. Retinal, short for retinaldehyde, is a form of vitamin A that sits one conversion step away from retinoic acid, the form skin cells actually respond to. It belongs in the evening, because light breaks it down. Here is what it is, how it compares to retinol, and how to get the most from it.
In short
- Retinal is retinaldehyde, a retinoid, and a form of vitamin A.
- It is one conversion step from retinoic acid. Retinol is two.
- Use it at night. Ultraviolet and part of visible light degrade retinoids.
- Encapsulation protects it from air and releases it slowly, which improves tolerance.
- Start two or three nights a week and build up. Wear sunscreen by day, indefinitely.
- Not for use during pregnancy or breastfeeding.
What retinal is
Retinal, short for retinaldehyde, is a form of vitamin A. It belongs to the family known as retinoids, one of the most researched groups of ingredients in skin science. Over time, retinoids are associated with skin that looks firmer, smoother, and more even.
Retinal sits at a useful point in that family. It is a step closer to the form skin uses than gentler versions, while being better tolerated than the strongest ones. Powerful is not always the goal. Well tolerated and consistent usually wins.
Retinal vs retinol vs retinoic acid
Every retinoid ends up in the same place. What separates them is how many steps it takes to get there. Skin converts them along a chain, and each step costs a little potency and buys a little tolerance.
| Form | Steps to retinoic acid | In practice |
|---|---|---|
|
Retinyl esters retinyl palmitate |
Three | The mildest. Often used in beginner or eye formulas. |
| Retinol | Two | The best-known form. Gentle, and slower to show. |
|
Retinal retinaldehyde |
One | Closer to the active form, and still available without a prescription. |
|
Retinoic acid tretinoin |
None. It is the active form. | Prescription only. The strongest, and the least forgiving. |
Read down that table and the appeal of retinal becomes clear. It is the closest you can get to the active form on a shelf rather than a prescription pad, without asking your skin to tolerate the active form itself.
How retinal works
Retinal is one step in a short chain. On skin, retinaldehyde converts to retinoic acid, the form of vitamin A that skin cells respond to. Retinoic acid signals to receptors inside the cell that influence how skin behaves, including how it renews and how much collagen it makes.
This is why retinoids are among the most studied ingredients in visible aging. With consistent use over time, research finds them associated with more collagen and a thicker, more resilient epidermis. It is also why they ask for patience. This is renewal at the pace of biology, not an overnight result.
Why we encapsulate it
Retinal has one inconvenient habit. It is delicate. It can lose its stability easily, and it can feel harsh on skin that is not used to it.
So ours is encapsulated. The retinal is held inside a protective shell that shields it from air, releases it slowly, and keeps it stable. That slow release is part of why our CEL™ Retinal Serum is formulated for high tolerability, and why skin appears visibly firmer and smoother over time rather than irritated in the meantime.
Why the evening, and not the morning
Retinal is sensitive to light. The ultraviolet light in sunlight breaks it down, and research shows that even part of visible light contributes. Worn in the morning, a retinal would spend the day exposed to the very thing that degrades it.
Worn in daylight, a retinal works against itself. In the evening, away from the light that breaks it down, it can simply do its work.
It is also why our serum lives in dark glass. The bottle keeps the light out even on the shelf. The encapsulation, as above, takes care of the light and air.
Why sunscreen still matters, long after you start
In the first weeks and months of use, skin can be more sensitive to the sun while it adjusts. A daily broad-spectrum sunscreen is not optional during this time.
But sunscreen matters long after the adjustment, and this is the part most people miss. Ultraviolet light is the largest outside cause of visible skin aging. A retinal works patiently on the look of firmness and smoothness. Skip the sunscreen, and you let the sun quietly undo the very thing the retinal is building. Protecting your skin by day is how you keep the results.
How to begin
Gently. Start every other night (skip 1 night) for 3 weeks, apply on slightly damp skin after cleansing, and build up as your skin settles. Patch test first if you are cautious. As skin adjusts, a little dryness in the early weeks is possible, although none of our 20 testers in clinical setting experienced dryness. If it feels like too much, use it less often.
On the nights you skip it, the Cellular Hydration Serum is the gentler alternative, and the hydrate-then-hold principle still applies. Either way, follow with the Exosome Advanced Night Cream to keep skin comfortable overnight.
Because ours is formulated for high tolerability, most skin adjusts well. But with a retinal, slow and steady always wins.
Common questions
Is retinal stronger than retinol?
It is closer to the active form, which is not quite the same as stronger. Retinal needs one conversion step to become retinoic acid where retinol needs two. In a well-formulated product, that shorter route is the point.
Can I use retinal in the morning?
We would not. Light degrades it, so a morning retinal spends the day being broken down by the very thing it should be protecting you against. Keep it to the evening and use antioxidants in the morning instead.
How long before I see anything?
Weeks, not days, and the meaningful changes take months. Retinoids work at the pace skin renews itself. Consistency over a season will do more than intensity over two weeks.
Can I use retinal with vitamin C?
Yes, by separating them. Vitamin C in the morning, retinal at night. That is how our routine is built, and it suits both ingredients rather than asking one to compromise.
Can I use retinal in perimenopause or menopause?
Yes, and it is a period when many people start. Skin tends to become drier and less resilient as hormones change, so the usual advice applies with more care. Build up slowly, keep the hydrating and moisturizing steps generous, and do not push through discomfort.
What if my skin peels or stings?
Reduce the frequency, do not stop and restart at full pace. Two nights a week, with a good moisturizing step, is a better plan than every night followed by two weeks off. The CEL™ Retinal Serum was tested on 20 women, all with sensitive skin. In the study, none of the women reported peeling nor stinging. So if this happens, it would be in a very small minority of general population.
Can I use retinal while pregnant?
No. Retinoids are set aside during pregnancy and breastfeeding. Come back to it afterwards.
Retinal rewards patience more than intensity. Keep it to the evening, wear your sunscreen by day, and let time do the rest.
Sources
- Mukherjee S, Date A, Patravale V, Korting HC, Roeder A, Weindl G. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clinical Interventions in Aging. 2006;1(4):327-348. PubMed
- Photostability of topical agents applied to the skin: a review. Pharmaceutics. 2020;12(1):10. On retinoid photodegradation by ultraviolet and visible light.
- Daily photoprotection to prevent photoaging. Photodermatology, Photoimmunology & Photomedicine. 2021. On ultraviolet radiation as the leading external contributor to visible skin aging, and on sunscreen in its prevention. PubMed
- Williams AL, DeSesso JM. Teratogen update: Topical use and third-generation retinoids. Birth Defects Research. 2020;112(15):1105-1114. On the teratogenic potential of topical retinoids and the standing recommendation to avoid their use during pregnancy. PubMed
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