Retinol: Topical vitamin A: the anti-ageing active with the most evidence without a prescription

What it is

Retinol is the cosmetic form of vitamin A. In the skin it is converted into retinaldehyde and then into retinoic acid, the active form. It is the most studied anti-ageing active sold without a prescription.

It has a bad reputation because, introduced badly, it irritates a lot. Introduced well —a little, a few nights, increasing slowly— it is one of the most effective things in a routine. In the EU, since Regulation 2024/996, its concentration in face products is limited to 0.3% retinol equivalent.

How it acts on the skin

Retinol acts in three ways at once:

It stimulates cell renewal: it speeds up the cycle, clearing damaged cells faster.
It stimulates collagen synthesis: it signals fibroblasts to make new collagen.
Some antioxidant effect

At the counter

When to recommend it

ANTI-AGEING: wrinkles, loss of firmness, from around 35.
Thick skin with visible pores: it refines.
After summer: regeneration after sun.
Cycles: 2–3 nights a week, not daily.

When not to

PREGNANCY and breastfeeding: avoid topical retinoids, including cosmetic ones, as a precaution
Very irritated skin: repair it first (ceramides)
In the first month, together with another irritating active
Intense sun exposure (beach holidays): better to pause it

What to say at the counter. 'Expect redness and flaking in the first 2–3 weeks: it's normal, it's called retinisation. Start with two nights a week and increase if you tolerate it.' Whoever knows this sticks with it; whoever doesn't brings it back.

Warnings

Important RETINISATION: in the first 2–4 weeks the skin goes red and flaky. YOU MUST WARN about it.
Important PHOTOSENSITIVITY: retinol + sun = dark spots. SPF 50 is essential.
Caution INCOMPATIBILITIES: retinol + AHA/BHA together irritate. Retinol + vitamin C can also irritate.
Caution CONCENTRATION IS NOT EVERYTHING: 0.3% in a poor formula works less well than 0.2% in a good one.
Worth knowing CONSISTENCY: results last as long as it is used; when stopped, they fade gradually.

Pharmacokinetics

Absorption: Fat-soluble: it needs an oily vehicle. In a water-based formula it does not work.
Distribution: Concentrations: 0.1% gentle, 0.2–0.3% moderate. In the EU, the cosmetic limit for the face is 0.3% retinol equivalent.
Metabolism: It is converted into retinoic acid in the skin. Adaptation of 2–4 weeks; visible results from 8–12.
Elimination: UV breaks it down and it increases sun sensitivity: ALWAYS at night, with SPF 50 the next morning.

Forms of vitamin A: potency and safety

Aspect	Retinol (cosmetic)	Retinoic acid (medicine)
Potency	Gentle to moderate (cosmetic)	Very potent (medicine)
Speed	4–8 weeks	2–4 weeks
Initial irritation	Moderate	Severe
Prescription	No	Yes
Pregnancy	Avoid as a precaution	Contraindicated
Where	Parapharmacy	Pharmacy

Cosmetic retinol is the entry point to anti-ageing with retinoids. Retinoic acid is a medicine, more potent and irritating, on prescription.

Self-assessment

Three questions. When you check your answers you will see the explanation for each one.

A customer in week 1 of retinol is red and flaky. What do you say? 'It's normal, it's retinisation. It should settle in 2–3 weeks' 'Use it every night to get used to it' 'That retinol is harming you, bring it back'
A pregnant woman asks whether she can carry on with her retinol. What do you tell her? Yes, being a cosmetic it is safe That she should use it only on alternate days That it is better to stop it during pregnancy and breastfeeding as a precaution, and that there are retinoid-free alternatives (niacinamide, azelaic acid)
A customer on retinol is going on a two-week beach holiday. Your advice? 'Pause the retinol, SPF 50 daily, start again when you're back' 'It's incompatible with holidays' 'Carry on with retinol, protect yourself with SPF'

Training content. It does not replace the summary of product characteristics or clinical judgement.

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