A silver pump tube of Medik8 Crystal Retinal 6 resting on a diagonal swatch of its peach-coloured cream against a clean white background. Text on the right features a silver wreath badge reading "WINNER OF 45+ GLOBAL AWARDS" and claims it is the "No.1 Retinal SERUM WORLDWIDE."

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Fine Lines and Wrinkles

Crystal Retinal®

Renew
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Firm
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Smooth

Award-winning Age-Defying Vitamin A Night Serum

Reveal younger-looking skin with just 1 tube of Crystal Retinal. Our iconic vitamin A night serum is clinically proven to visibly smooth stubborn wrinkles, brighten dark spots, decongest and firm your skin - without irritation.^[1]

Crystal Retinal contains retinAL; a next-generation vitamin A which acts 11x faster than standard retinOL.^[2] And, unlike others, our patented retinal stability system ensures unmatched retinal potency and effectiveness until the very last drop.

It’s no wonder Crystal Retinal is the No.1 Retinal Serum Worldwide.^[3]

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Reasons to shop Medik8

Free UK delivery over £25

15% off your first order

"No questions asked" easy 30 day returns

Advanced Night Restore™

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Nourish
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Firm

Rejuvenating Multi-Ceramide Night Cream

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Key Benefits

Fast Wrinkle Reducing Power

See clinically proven wrinkle reduction with just 1 tube^[1]

Radiant, Youthful Skin

Delivers remarkable visible improvement in texture, brightness, firmness & clarity

Customise Your Routine With 6 Progressive Strengths

A retinal strength for beginners to expert users - even sensitive skin

Professional-Grade Results

Retinaldehyde is proven to work up to 11 times faster than standard retinol^[2] - so you can see results sooner

Effective Results Until the Last Drop

Thanks to Medik8's patented stability complex

Proven Results

97% felt their skin had a more youthful appearance^[1]

20% reduction in the appearance of wrinkles^[1]

20% reduction in visible hyperpigmentation^[1]

11% increase in visible skin firmness^[1]

100% felt Crystal Retinal was gentle on their skin^[1]

[1] Proven via independent clinical study on Crystal Retinal 6. Tested on 33 participants over 12 weeks. [2] G. Siegenthaler et al., Retinol and retinal metabolism, Biochemical Journal, 1990, 268, pp 371-378. [3] Source: independent market research by Kline & Company analysing manufacturer-level retinal serum sales for 2025. To verify, visit: https://www.medik8.com/pages/claims | Please Note: Product packaging shown may be different to the product received due to regional variations.

How to Use

First-time use

If you're new to Crystal Retinal we recommend a patch test at least 24 hours before first use. Learn how to patch test here.

Phase application in gradually. Use twice a week for the first 2 weeks, every other night for the next 2 weeks, then every night.

Step 1

After cleansing in the evening, apply 2 pumps of Crystal Retinal to the face and neck. Allow to absorb.

Step 2

Follow with a moisturiser. We recommend Advanced Night Restore which is engineered to be used after vitamin A (retinoids).

Step 3

Always use a sunscreen the next morning after using vitamin A. We recommend Advanced Day Ultimate Protect.

NOTE

We recommend using at least 1 tube of your current Crystal Retinal strength before moving up the ladder to the next strength.

Uses per tube

100

Available Strengths

Only at Medik8, you can ladder up your visible age-defying results over time with Crystal Retinal's 6 progressive strengths.

Offering 0.01% - 0.24% retinaldehyde, there’s a strength for everyone; from very sensitive skins to expert users.

Take our easy quiz to find your strength.

Guide to Layering

Step 1: Cleanse

Medik8 Surface Radiance Cleanse tube displayed on a clean white background with a large, translucent gel texture smear. Text identifies it as a Resurfacing AHA/BHA Mangosteen Cleansing Gel in a 150mL size.

Morning

Evening

Surface Radiance Cleanse™

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Step 2: Target

Morning

Evening

Liquid Peptides Advanced MP

Full Size (50ml)

Step 3: Renew

Evening

Crystal Retinal®

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Step 4: Moisturise

Evening

Advanced Night Restore™

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Key Ingredients

Retinaldehyde

Proven to work up to 11 times faster than standard retinol,^[2] retinaldehyde (retinal for short) is a revolutionary form of vitamin A that effectively targets the appearance of fine lines and wrinkles, hyperpigmentation, uneven skin texture and loss of firmness - without irritation

Hyaluronic Acid

With the ability to attract and retain more than 1,000 times its own weight in water, hyaluronic acid draws moisture into the upper layers of the skin; leaving the complexion hydrated and visibly supple.

Vitamin E

A powerful antioxidant that provides additional antioxidant protection against the ageing effects of free radicals. It also helps to boost the power of vitamin C for optimum visible results.

Glycerin

A natural humectant which traps moisture within the skin to leave it hydrated and comfortable.

Vitamin E

A powerful antioxidant that provides additional antioxidant protection against the ageing effects of free radicals. It also helps to boost the power of vitamin C for optimum visible results.

Glycerin

A natural humectant which traps moisture within the skin to leave it hydrated and comfortable.

Clinically-proven formula
Dermatologist recommended
No artificial fragrance
No synthetic colours
Paraben free
Alcohol free

Expert Recommended

"When it comes to recommending a retinoid, my unwavering choice is Crystal Retinal. This exceptional product has become my top recommendation for both patients and followers, thanks to its remarkable effectiveness and pioneering approach to skincare."

DR EWOMA UKELEGHE

Medical & Cosmetics Doctor

A circular portrait of a smiling skincare professional wearing a branded lab coat, holding two silver Crystal Retinal tubes in a brightly lit laboratory setting.

"Really helps keep skin smooth, while tackling fine lines."

NADINE BAGGOTT

Skincare Expert & Beauty Journalist

"I swear by Medik8's Crystal Retinal Range - especially for nighttime use."

DR. JUSTINE KLUK

Consultant Dermatologist

"A true breakthrough in vitamin A skincare."

DANIEL ISAACS

Chief Product Officer

Complete Your Regime

Frequently Asked Questions

When, and how, should I apply Crystal Retinal - do I need to phase it into my routine?

When, and how, should I apply Crystal Retinal - do I need to phase it into my routine? Yes. You should apply Crystal Retinal as part of your evening skincare routine - after cleanser, toner and serums, but before your moisturiser. We always recommend phasing Crystal Retinal into your existing skincare regimen; using it twice a week for two weeks, then every other night for two weeks, then every night after that. You do not have to phase in when moving up a strength within the Crystal Retinal ladder (e.g. when moving from Crystal Retinal 3 to Crystal Retinal 6)

Can I use Crystal Retinal every night?

As long as you build up gradually and start with the appropriate strength, you can use Crystal Retinal every night. For new users, we strongly recommend that you phase in application to enable your skin to build a tolerance while avoiding any potential irritation. Use twice a week for the first 2 weeks, every other night for the following 2 weeks, then every night.

Can I use Crystal Retinal while pregnant or breastfeeding?

As a cosmetics company, we are unable to provide product advice in relation to medical conditions such as pregnancy or breastfeeding. We strongly recommend discussing the ingredients with your GP or midwife before use. We do, however, generally recommend avoiding vitamin A use while pregnant or breastfeeding, which is why we offer a plant-based vitamin A alternative - Bakuchiol Peptides.

Do I need to follow Crystal Retinal with a moisturiser?

We do recommend applying a moisturiser after vitamin A. Our bestselling night cream, Advanced Night Restore, is specifically designed to be used following vitamin A use. It helps to boost the visible age-defying benefits of vitamin A while maintaining optimal comfort.

Will Crystal Retinal 20 / Crystal Retinal 24 make my skin yellow or orange?

Crystal Retinal is designed for nighttime use, followed by a nighttime moisturiser (such as Advanced Night Restore). The higher strengths may leave skin with a slightly peachy tint. However, when blended under a night cream, this is less visible.

When can I move up the ladder from my current Crystal Retinal strength?

We recommend using at least 1 tube of your current Crystal Retinal strength before moving up the ladder to the next strength.

When can I move up to Crystal Retinal 24?

You can move up to Crystal Retinal 24 once you have used at least 1 tube of Crystal Retinal 20. Crystal Retinal 24 is a very high-strength retinal serum, so we advise closely monitoring your skin during the first 2 weeks of use. If you feel any sensitivity during this time, we would suggest reducing the amount of product you apply or applying every other night to begin with.

Why can't I use Crystal Retinal during the day and is it safe when I'm going out in the sun?

Crystal Retinal is completely safe to use if you're going to be exposed to sunlight, as long as you are applying a high protection sunscreen daily. Vitamin A is actually great for use during the summer months as it helps to counteract the visible effects of sun damage but, like all vitamin A formulas, it can make your skin more sensitive. It is also not a photostable ingredient which means it can lose its power and degrade when exposed to direct sunlight. This is why we strongly recommend using Crystal Retinal at night, and then applying a liberal amount of high protection sunscreen the following day. If you are in direct sunlight, we always recommend reapplying your sunscreen every 2 hours.

If you are looking for a vitamin A formula that can be used both morning and evening, try r-Retinoate Day & Night. Formulated with retinyl retinoate, it remains stable when exposed to UV light, meaning it can be used in both your daytime and nighttime regimens.

Can I use Crystal Retinal if I have sensitive skin?

Absolutely, with our unique ladder of progressive strengths which serves all skin types. Crystal Retinal 1 (0.01% retinaldehyde) is specifically formulated as the appropriate strength for those with sensitive skin who still want visible age-defying results.

What percentage of retinal is in Crystal Retinal 24?

Crystal Retinal 24 contains 0.24% retinaldehyde - our highest concentration to date and the very top of our unique Crystal Retinal ladder. We therefore recommend Crystal Retinal 24 for expert vitamin A users only - those who have used at least 1 tube of Crystal Retinal 20.

Can I use Crystal Retinal around my eye area?

We don't recommend using Crystal Retinal directly around the eye area due to its very delicate nature. However, that's exactly why we've created Crystal Retinal Ceramide Eye. It boasts all of the renowned age-defying power of our original Crystal Retinal, but is expertly optimised for specific use on the delicate eye area.

How do I use Crystal Retinal alongside vitamin C?

We recommend using vitamin C alongside Crystal Retinal (vitamin A) as part of our pioneering CSA Philosophy. This simple yet clinically proven skincare approach champions vitamin C plus Sunscreen by day, vitamin A (retinoids) by night as the secret to youthful, glowing skin. After cleansing in the morning, apply your vitamin C serum (such as C-Tetra Luxe) and follow with your sunscreen (we recommend Advanced Day Ultimate Protect). After cleansing in the evening, apply Crystal Retinal.

Why are Crystal Retinal 20 and Crystal Retinal 24 peach-coloured?

The bright peachy tone of Crystal Retinal 20 and Crystal Retinal 24 is a combination of the natural yellow colour of the retinal, and some natural extracts which shift the colour from yellow to a more peachy tone. Crystal Retinal 20 and Crystal Retinal 24 are brighter than the lower strengths of Crystal Retinal due to their higher concentration of retinal.

Will Crystal Retinal 20 / Crystal Retinal 24 stain my bedding, pillows, or pyjamas?

Crystal Retinal’s peachy tone gets more intense as you go up the ladder and may create a peachy tone on the face or potentially transfer onto bed sheets. Colour left on bedsheets can be mitigated by allowing Crystal Retinal to absorb fully and dry before making contact with light-coloured fabrics (such as pyjamas, bedding, or pillows). We would also recommend applying a moisturiser over the top of Crystal Retinal 20 / Crystal Retinal 24 to seal it in. If sheets are left with colour on them, wash at 30 degrees and leave to dry in the sunlight - retinal degrades in the sun which helps the colour to quickly fade away.

What is the difference between Crystal Retinal 20 and 24?

Crystal Retinal 20 contains 0.2% retinaldehyde, while Crystal Retinal 24 contains 0.24%. Crystal Retinal 20 is recommended for experienced vitamin A users (those who have used at least 1 tube of Crystal Retinal 10). Crystal Retinal 24 is recommended for expert vitamin A users only (those who have used at least 1 tube of Crystal Retinal 20).

What is a good percentage of retinaldehyde and which Medik8 Crystal Retinal should I start with?

Proven to act 11x faster than standard retinol*, retinaldehyde is a very effective age-defying ingredient. What is a ‘good’ percentage for you depends entirely on your skin type and experience using vitamin A.

Our unique ladder of progressive Crystal Retinal strengths offers 6 different percentages of retinaldehyde. We recommend use of our progressive strengths as follows:

Crystal Retinal 1 (0.01% retinaldehyde): For those with sensitive skin
Crystal Retinal 3 (0.03% retinaldehyde): For new vitamin A users
Crystal Retinal 6 (0.06% retinaldehyde): For regular vitamin A users
Crystal Retinal 10 (0.1% retinaldehyde): For advanced vitamin A users
Crystal Retinal 20 (0.2% retinaldehyde): For experienced vitamin A users
Crystal Retinal 24 (0.24% retinaldehyde): For expert vitamin A users

Which is stronger; retinol or retinal, and how does Crystal Retinal compare?

Crystal Retinal is formulated with retinAL, which is one conversion step closer to the active form of vitamin A (retinoic acid) than retinOL is. It therefore acts 11x faster than standard retinol[2] to deliver visible age-defying results. Crystal Retinal's unique formulation also means that the retinal remains gentle on skin while delivering powerful age-defying benefits.

How long does Crystal Retinal take to work?

Crystal Retinal is clinically proven to deliver visible improvement on wrinkles as well as skin smoothness and brightness in as little as 7 days.*

^{*Proven via independent clinical study on the Crystal Retinal ladder tested on 30 participants over 24 weeks.}

Is 0.1 retinal effective?

Crystal Retinal 10 contains 0.1% retinaldehyde (retinal) which is a very effective strength for delivering visible age-defying results. We recommend Crystal Retinal 10 for advanced vitamin A users, looking to build on their visible results after using Crystal Retinal 6 (0.06% retinaldehyde).