BurgerClosechevronBagSearchUser
  • Delivery country: United Kingdom
  • servicesStores & services
    Belfast, Victoria Square
    Stores
    Sephora Belfast, Victoria Square
    Victoria Square, Bridge St, Belfast, BT1 4QG
    View All Hours +
    Cycle
    Change your store

    Your favourite store allows you to see services available and book appointments

    In-Store Services
    Make-up and skincare services, Benefit BrowBar, gifting and personalisation workshop, Sephora offers you a whole range of services to come and discover in store Make an appointment
    (Belfast, Victoria Square)
    See Belfast, Victoria Square store servicesView all stores
  • Wishlist
  • Cart0
Crystal Retinal 6
Hot On Social

Medik8 Crystal Retinal 6 30ml

%0 4.71 | 3492 reviews
Box

£69.00 (£2.30 per ml)

Free UK delivery

In stock

If you like we can let you know when we have some more.

Product Description

Reveal visibly firmer, brighter-looking skin with just 1 tube of Crystal Retinal.

Medik8’s bestselling vitamin A night serum is formulated with next-generation retinaldehyde (retinal) which is clinically proven to act 11x faster than retinol* for a visibly brighter, smoother and firmer-looking complexion.

Unlike other retinal serums available, Crystal Retinal features Medik8’s unique patented stability system to ensure maximum retinal potency, while their industry-leading encapsulation technology delivers powerful yet gentle results with minimal irritation, even on sensitive skin types.

Loved and recommended by dermatologists and professionals all over the world, Crystal Retinal features a unique ladder of 5 progressive strengths (0.01%-0.2% retinal) so that you can continue to experience increased visible youth-renewing results. If you’re a vitamin A beginner, Medik8 recommends that most people start on Crystal Retinal 3 (0.03%), or Crystal Retinal 1 if you have very sensitive skin (0.01%). If you’re an experienced vitamin A user, start with Crystal Retinal 6 (0.06%) and gradually work your way up to Crystal Retinal 20 (0.2%). To use Crystal Retinal 20, you must have comfortably finished at least 2 tubes of Crystal Retinal 10 due to it containing a high percentage of retinal.

Working to reduce the appearance of stubborn fine lines and wrinkles and dark spots, Crystal Retinal is the ultimate age-defying serum for a healthier, more youthful-looking complexion.
*G. Siegenthaler et al., Retinol and retinal metabolism, Biochemical Journal, 1990, 268, pp 371-378

Key Benefits:
Fast Wrinkle Reducing Power
Clinically proven to visibly reduce wrinkles & dark spots by 20% with just 1 tube*
*Proven via independent clinical study on Crystal Retinal 6. Tested on 33 participants over 12 weeks.

Professional-Grade Results
Retinaldehyde is proven to work up to 11 times faster than classic retinol* - so you can see results sooner
*G. Siegenthaler et al., Retinol and retinal metabolism, Biochemical Journal, 1990, 268, pp 371-378

Radiant, Youthful Skin
97% felt their skin had a more youthful appearance*
*Proven via independent clinical study on 1 tube of Crystal Retinal 6. Tested on 33 participants over 12 weeks.

Effective Results Until the Last Drop
Thanks to Medik8's patented stability complex

Customise Your Routine With 5 Progressive Strengths
A retinal strength for beginners to expert users - even on sensitive skin

Proven Results:
97% felt their skin had a more youthful appearance*
20% reduction in the appearance of wrinkles*
20% reduction in visible hyperpigmentation*
11% increase in skin firmness*
100% felt Crystal Retinal was gentle on their skin*
*Proven via independent clinical study on 1 tube of Crystal Retinal 6. Tested on 33 participants over 12 weeks.

Key Ingredients:
Retinaldehyde
Retinaldehyde (retinal for short) is a revolutionary form of vitamin A that is clinically proven to work 11x faster than traditional retinol* to address the appearance of fine lines and wrinkles, uneven skin texture, loss of firmness and hyperpigmentation without any irritation.
*G. Siegenthaler et al., Retinol and retinal metabolism, Biochemical Journal, 1990, 268, pp 371-378

Hyaluronic Acid
An incredibly hydrating ingredient, hyaluronic acid attracts and retains more than 1,000 times its own weight in water and draws moisture in the upper layers of the skin; leaving it looking visibly supple and deeply hydrated.

Vitamin E
Rich in antioxidants, vitamin E helps to protect the skin against ageing free radicals, while helping to stabilise retinal for maximum results.

Glycerin
A natural humectant that locks moisture into the skin; leaving it feeling comfortable and hydrated.

Good to Know:
CLINICALLY-PROVEN FORMULA
DERMATOLOGIST RECOMMENDED
NO ARTIFICIAL FRAGRANCE
NO SYNTHETIC COLOURS
PARABEN FREE
ALCOHOL FREE

Directions

Step 1
After cleansing in the evening, apply 2 pumps of Crystal Retinal to the face and neck. Allow to absorb then follow with a moisturiser. We recommend Advanced Night Restore which is specifically designed to be used after vitamin A.

Step 2
For new users of Crystal Retinal, phase application in gradually. Use twice a week for the first 2 weeks, every other night for the next 2 weeks, then every night. You should always use a sunscreen the next morning after using vitamin A.

How to Layer Crystal Retinal
PM: In your evening routine, first cleanse and apply your target serum. Follow with Crystal Retinal and finally, your moisturiser.

Ingredients

Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.

This list of ingredients may be subject to change, please consult the packaging of the product purchased.

See more...

Rated 5 out of 5 by from 49 years old and seeing a real improvement I’m 49 years old, I’m seeing a difference in my fine lines, especially around the mouth. It’s a lovely cream to use, you don’t need much and I can honestly say I will be a loyal fan to this product.
Date published: 2026-05-18
Rated 5 out of 5 by from Lovely product applies nicely and [This review was collected as part of a promotion.] Lovely product applies nicely and no issues from it at all
Date published: 2026-05-18
Rated 3 out of 5 by from Probably not. Probably still too soon to tell but no particular difference showing in my skin despite using this retinol nightly, plus topical vitamin C in the morning. Nothing so far to make me commit to another purchase when my previous much cheaper routine makes my skin look and feel the same.
Date published: 2026-05-17
Rated 5 out of 5 by from Love it [This review was collected as part of a promotion.] Have seen such a difference in a short time definitely going to be part of my routine
Date published: 2026-05-17
Rated 5 out of 5 by from Retinal Lover [This review was collected as part of a promotion.] My skin has seen such an improvement from using this but the retinal is still gentle on the skin. The product smells nice and neutral and applies evenly. Love Medik8 products and this one is no different ✨
Date published: 2026-05-16
Rated 5 out of 5 by from Worth it [This review was collected as part of a promotion.] I’ve been using the Medik8 Retinal 6 serum for the past few months, and I absolutely love it! Even though it’s a potent formula, I’ve had zero irritation, and it layers really easily with my other products. My skin feels smoother, more even, and just overall brighter. I can’t recommend it enough—definitely a new staple in my routine!
Date published: 2026-05-15
Rated 5 out of 5 by from I was dubious about using, [This review was collected as part of a promotion.] I was dubious about using, so have started on number 3, and followed the guidance for first use. I am happy to report that my skin has accepted this level and am now up to using it every other night. Skin looks and feels more youthful, which is great.
Date published: 2026-05-15
Rated 5 out of 5 by from fantastic [This review was collected as part of a promotion.] Absolutely amazing, ive been buying repeatedly when it runs out. Decided to go for 6% next. Makes skin look glowy and clean. I am trained in skincare and I recommend this to my clients.
Date published: 2026-05-14
  • y_2026, m_5, d_21, h_10
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.46
  • cp_1, bvpage1
  • co_hasreviews, tv_39, tr_3446
  • loc_en_GB, sid_143619, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_sephora-uk
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getReviews, 111.64ms
  • REVIEWS, PRODUCT

I am on retinal 3 at the moment can I move up to 6 now 

Asked by: Thera
If you have used retinal 3 for a while and your skin is okay with it, then yes I would say you can try 6. 
Answered by: Rachel
Date published: 2024-09-04

Can I use this serum under eyes?

Asked by: Anonymous
I think it might be too potent for under eye 
Answered by: Anonymous
Date published: 2024-07-19
  • y_2026, m_5, d_21, h_10CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.46
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
  • loc_en_GB, sid_143619, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_sephora-uk
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 117.87ms
  • QUESTIONS, PRODUCT