Retinol has been in cosmetic skincare since the 1980s, which makes it the most studied ingredient on most people's shelves. It also has a reputation for being difficult – and that reputation is largely earned by people being sold the wrong strength on day one. Here's how it actually works, how to choose a starting point, and how to use it without spending three weeks flaking.
What retinol is
Retinol is a form of vitamin A. Your skin can't use it in that form directly, so it converts it in stages — retinol becomes retinaldehyde, which becomes retinoic acid, which is the form skin cells actually respond to. Every conversion step loses a little potency, which is the key to understanding the whole category.
That's why you'll see so many different names on packaging. Retinyl palmitate is an ester, furthest from the active form and the gentlest. Retinol sits in the middle. Retinaldehyde is one step closer, so it works faster and tends to be felt more. Retinoic acid itself is prescription-only in the UK — that's tretinoin, and it isn't a cosmetic ingredient. Anything you can buy over the counter needs converting by your skin first.
Then there's encapsulated retinol, which isn't a different molecule but a different delivery: the retinol is held in a carrier that releases it gradually. Formulas like these are often better tolerated at the same percentage, and they're where we'd usually send someone starting out.
What it's used for
Retinol influences how quickly skin cells turn over. In cosmetic terms, that's why it's associated with the appearance of fine lines, rough or uneven texture, dullness, and the look of enlarged pores — and why skin often looks smoother and more even after several months of consistent use.
Two honest caveats. First, this is a slow ingredient: meaningful change in the look of your skin takes twelve weeks or more, not two. Anyone promising a transformed complexion by the weekend is selling you something. Second, retinol can't do everything — if you have a diagnosed skin condition, that's a conversation for your GP or a dermatologist rather than a serum.
Choosing a strength
This is where most people go wrong. Percentages aren't comparable across different retinoid types — 0.3% retinaldehyde is not the same proposition as 0.3% retinyl palmitate — so the number on the bottle only means something once you know which form you're buying.
As a rough guide: if you've never used a retinoid, start with an ester or an encapsulated retinol around 0.2–0.3%. If you've used retinol happily for a year, 0.5–1% is a reasonable next step. Retinaldehyde is worth considering if you want results faster and your skin has already proved it can cope. There's no prize for starting high; the people who get on best with retinol are almost always the ones who started low and stayed consistent.
How to use it
Night only, on dry skin, and less than you think — a pea-sized amount covers the whole face. Applying to damp skin increases penetration and, with it, the chance of irritation, so let your face dry properly after cleansing.
Begin twice a week and build up. If that's comfortable after a fortnight, move to every other night. Many people are perfectly happy staying at three nights a week indefinitely; nightly use isn't a goal in itself. If your skin gets tight, flaky or stings when you apply moisturiser, you've gone too fast — drop back a step rather than pushing through.
The "sandwich" method helps if you're sensitive: moisturiser, then retinol, then moisturiser again. It slows delivery slightly and takes the edge off, which is a fair trade while your skin adjusts.
What to pair it with — and what to keep apart
Retinol pairs beautifully with the calming, hydrating side of a routine. Niacinamide, hyaluronic acid, ceramides and squalane all make retinol easier to live with, and there's no reason to avoid using them on the same night.
Keep it away from your strong exfoliating acids — glycolic, lactic and salicylic — at least while you're building tolerance. Alternate nights rather than layering. Combining them isn't dangerous, but it's the fastest route to a compromised, uncomfortable barrier, and you won't know which product caused it.
The non-negotiable: daily SPF. Retinol can leave skin more sensitive to sunlight, and sun exposure works directly against the appearance changes you're using it for. If you're not prepared to wear sunscreen every morning, retinol isn't the right ingredient for you yet.
If retinol doesn't suit you
Some people simply don't get on with it, and that's fine. Bakuchiol is a plant-derived alternative that's far gentler and often chosen by those with reactive skin or during pregnancy — though if you are pregnant or breastfeeding, check with your GP or midwife before using any vitamin A skincare, including retinol.
Equally, peptides and vitamin C address similar concerns from different angles, and a well-formulated moisturiser will do more for skin that's genuinely irritated than any active will.
Explore our retinol skincare, or see the full range of active skincare.