# The best retinol and retinal serums.

> Four evening retinoids compared by type and stated strength, fragrance, build-up schedule and UK price — with what the EU’s new retinol limit means for shoppers in the UK.

- Canonical: https://thecastindex.com/beauty/best/best-retinol-serums
- Author: Kaiser Khan (Founder & Editor)
- Published: 2026-09-25
- Updated: 2026-09-25
- Category guide: https://thecastindex.com/beauty/category/skin-prep
- Method: desk research from published formulas, specifications and brand/retailer information — not lab or hands-on tested

## Quick answer

**What is the best retinol serum in the UK?**

Medik8 Crystal Retinal is the best overall: retinal in six strengths from 0.01% to 0.24%, so you can start low and move up, from £45. La Roche-Posay’s 0.3% Retinol + B3 suits a cautious first retinol; Geek & Gorgeous A-Game 10 is the fragrance-free budget retinal; The Ordinary Retinal 0.2% is for experienced users.

## Our top picks

- **Best overall:** Medik8 Crystal Retinal — Retinal 0.01%–0.24% · six strengths · 30ml
- **Best first retinol:** La Roche-Posay 0.3% Retinol + Vitamin B3 Serum — 0.3% retinol · niacinamide · evening only
- **Best budget retinal:** Geek & Gorgeous A-Game 10 — 0.1% retinal · fragrance-free · 30ml
- **Best for experienced users:** The Ordinary Retinal 0.2% Emulsion — 0.2% retinal · 15ml · weekly start

## Side by side

| Product | Award | Finish | Key spec | Guide price |
| --- | --- | --- | --- | --- |
| [Medik8 Crystal Retinal](https://thecastindex.com/beauty/medik8-crystal-retinal) | Best overall | Serum | Retinal 0.01%–0.24% · six strengths · 30ml | from £45 |
| [La Roche-Posay 0.3% Retinol + Vitamin B3 Serum](https://thecastindex.com/beauty/la-roche-posay-retinol-b3-serum) | Best first retinol | Lightweight serum | 0.3% retinol · niacinamide · evening only | £48 |
| [Geek & Gorgeous A-Game 10](https://thecastindex.com/beauty/geek-and-gorgeous-a-game-10) | Best budget retinal | Silky emulsion | 0.1% retinal · fragrance-free · 30ml | £17.95 |
| [The Ordinary Retinal 0.2% Emulsion](https://thecastindex.com/beauty/the-ordinary-retinal-02-emulsion) | Best for experienced users | Light emulsion | 0.2% retinal · 15ml · weekly start | £15.20 |

Prices are UK guide prices from the brand’s official page or a named UK retailer, checked 2026-09-25; they may have changed.

## The picks in detail

### 1. Best overall: Medik8 Crystal Retinal

Crystal Retinal is built as a progression: six numbered strengths of retinaldehyde, a written build-up schedule and a rule to finish one tube before moving up. That structure makes it the clearest route from a first retinoid to an advanced one.

What stands out:
- Six strengths from 0.01% to 0.24% retinaldehyde
- Clear build-up schedule and a one-tube-per-strength rule
- Vegan Society certified
- A UK brand with its own UK store

Consider first:
- Not strictly fragrance-free: coumarin, tonka bean and vanilla extracts are listed
- £45 to £114 depending on strength
- Medik8 advises avoiding vitamin A in pregnancy and breastfeeding

Product guide: https://thecastindex.com/beauty/medik8-crystal-retinal
Official page: https://www.medik8.com/products/crystal-retinal

### 2. Best first retinol: La Roche-Posay 0.3% Retinol + Vitamin B3 Serum

La Roche-Posay labels this serum 0.3% retinol with niacinamide and writes a gradual schedule into its directions: once or twice a week, building to five to seven nights. It is a measured, well-signposted place to start.

What stands out:
- Stated 0.3% retinol with niacinamide
- Gradual build-up schedule in the brand’s directions
- Lightweight dropper serum
- Sold by major UK beauty retailers

Consider first:
- Contains fragrance and denatured alcohol, despite its sensitive-skin positioning
- £48 for 30ml
- A single strength, so there is no step up within the product

Product guide: https://thecastindex.com/beauty/la-roche-posay-retinol-b3-serum
Official page: https://www.laroche-posay.co.uk/en_GB/retinol-b3-anti-ageing-serum-for-sensitive-skin-30ml/LRP_115.html

### 3. Best budget retinal: Geek & Gorgeous A-Game 10

A-Game 10 delivers 0.1% retinal in a silky emulsion free from fragrance and essential oils for £17.95 — the lowest price per millilitre for retinal in this guide. A-Game 5, at 0.05%, is the lower-strength way in.

What stands out:
- 0.1% retinal for £17.95 (30ml)
- Free from fragrance and essential oils, per the brand
- A lower-strength A-Game 5 is available
- A written build-up schedule

Consider first:
- Sold mainly through the brand’s UK shop, run by its distributor
- Positioned for experienced users; beginners should start with A-Game 5
- The brand says not to use it during pregnancy

Product guide: https://thecastindex.com/beauty/geek-and-gorgeous-a-game-10
Official page: https://geekgorgeous.co.uk/products/a-game-10

### 4. Best for experienced users: The Ordinary Retinal 0.2% Emulsion

The Ordinary puts 0.2% retinaldehyde — a high strength — into a £15.20 emulsion, with directions that start once a week and build only to twice a week. It is for people who already tolerate retinoids and want a stronger step.

What stands out:
- 0.2% retinaldehyde
- No fragrance on the ingredient list; vegan
- £15.20
- Clear, low-frequency directions

Consider first:
- Not for beginners
- 15ml — half the size of the other picks
- Must not be combined with other retinoids
- The brand notes its products have not been tested in pregnancy or breastfeeding

Product guide: https://thecastindex.com/beauty/the-ordinary-retinal-02-emulsion
Official page: https://theordinary.com/en-gb/retinal-02-emulsion-100646.html

## What to look for

### Retinol or retinal?

In the skin, retinol is turned into retinal and then into retinoic acid. Retinal is one step closer, so it is used at lower percentages. Compare strengths within the same retinoid, not across them.

### A stated strength

Choose a product that tells you its percentage. It makes starting low — and moving up later — a deliberate decision rather than a guess.

### Start slowly

The American Academy of Dermatology suggests starting every other night and building up, with moisturiser to limit irritation. Every brand here writes its own schedule into the directions; follow the one on your pack.

### Night use, daytime SPF

All four picks are evening products. Wear sunscreen every morning while you use a retinoid.

### Pregnancy

The NHS says topical retinoids are not suitable during pregnancy. The brands here advise avoiding vitamin A while pregnant; speak to a GP, midwife or pharmacist.

### The new EU limit

Since 1 November 2025, new cosmetics placed on the EU market must keep retinol and its esters to 0.3% retinol equivalent in most leave-on products and 0.05% in body lotion. The rule does not cover retinal. Great Britain had not adopted it by September 2026; Northern Ireland follows EU rules.

## How we chose

This guide is desk research. We compared retinol and retinal serums sold in the UK using the brands’ published formulas, ingredient lists, specifications and directions, together with UK prices from official pages or named retailers on 25 September 2026. None of the products was tested in a laboratory or worn by our editors for this guide.

We prioritised products that state their retinoid type and strength and publish a build-up schedule, and we recorded fragrance, pregnancy guidance and UK price for each.

Awards describe fit — the job a product is best suited to — rather than a single overall score. Brand claims are reported as brand claims. No brand paid for inclusion, and shopping links elsewhere on the site do not influence which products appear here.

## Questions

### What is the difference between retinol and retinal?

Both are forms of vitamin A. In the skin, retinol is turned into retinal and then into retinoic acid, so retinal is one step closer to the active form and is used at lower percentages. Medik8, The Ordinary and Geek & Gorgeous use retinal; La Roche-Posay uses retinol.

### Which retinoid strength should a beginner use?

Start at the lowest strength a range offers and follow the brand’s build-up schedule. Medik8 Crystal Retinal 1 and Geek & Gorgeous A-Game 5 are the low entry points in this guide; The Ordinary’s 0.2% retinal is for experienced users.

### Can I use retinol during pregnancy?

The NHS says topical retinoids are not suitable during pregnancy, and the brands here advise avoiding vitamin A while pregnant. Speak to a GP, midwife or pharmacist.

### Is retinol above 0.3% banned in the UK?

Not in Great Britain. The EU limits retinol and its esters to 0.3% retinol equivalent in most leave-on cosmetics under Regulation (EU) 2024/996, and Northern Ireland follows EU rules, but Great Britain had not adopted an equivalent limit as of September 2026.

### Should I use retinol in the morning?

No. Every product in this guide is directed for evening use. Wear sunscreen the next morning.

## Sources

- [American Academy of Dermatology — Retinoid or retinol?](https://www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/retinoid-retinol)
- [NHS — Acne treatment (topical retinoids and pregnancy)](https://www.nhs.uk/conditions/acne/treatment/)
- [EUR-Lex — Regulation (EU) 2024/996 on vitamin A in cosmetics](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32024R0996)
- [legislation.gov.uk — GB Cosmetics Regulation, Annex III](https://www.legislation.gov.uk/eur/2009/1223/annex/III)
- [GOV.UK — Cosmetic products regulation in Northern Ireland](https://www.gov.uk/government/publications/cosmetic-products-enforcement-regulations-2013/regulation-20091223-and-the-cosmetic-products-enforcement-regulations-2013-northern-ireland)
- [Medik8 — Crystal Retinal 24 strength](https://www.medik8.com/pages/new-strength-formula-crystal-retinal-24)
- [LOOKFANTASTIC — La Roche-Posay Retinol B3 Serum 30ml](https://www.lookfantastic.com/p/la-roche-posay-retinol-b3-anti-wrinkle-anti-ageing-serum-with-retinol-and-vitamin-b3-suitable-for-sensitive-skin-30ml/12382710/)
- [Medik8 Crystal Retinal — official product page](https://www.medik8.com/products/crystal-retinal)
- [La Roche-Posay 0.3% Retinol + Vitamin B3 Serum — official product page](https://www.laroche-posay.co.uk/en_GB/retinol-b3-anti-ageing-serum-for-sensitive-skin-30ml/LRP_115.html)
- [Geek & Gorgeous A-Game 10 — official product page](https://geekgorgeous.co.uk/products/a-game-10)
- [The Ordinary Retinal 0.2% Emulsion — official product page](https://theordinary.com/en-gb/retinal-02-emulsion-100646.html)

## Head-to-head comparisons

- [Crystal Retinal vs The Ordinary Retinal 0.2%](https://thecastindex.com/beauty/vs/medik8-crystal-retinal-vs-the-ordinary-retinal)