

Medik8 Crystal Retinal 6 contains 0.06% retinaldehyde in an evening facial serum. Medik8 positions this strength for regular vitamin A users, making it an option for those considering a step beyond an introductory retinal.
Retinoid skincare can help address the appearance of fine lines, uneven pigmentation and rough texture. The appropriate strength depends on your existing routine and skin tolerance, rather than age alone. Consistent, comfortable application is more useful than increasing concentration before your skin is ready.
| Product | Medik8 Crystal Retinal 6 |
|---|---|
| Size | 30ml |
| Vitamin A ingredient | Retinaldehyde 0.06% |
| Range position | Regular vitamin A users |
| Routine | Evening, before moisturiser |
Crystal Retinal 3 contains 0.03% retinal; Crystal Retinal 6 contains twice that concentration. This does not establish that results will be twice as fast or twice as noticeable.
Before changing strength, consider whether you can use your current product consistently without persistent dryness, stinging or redness. If you regularly need to pause because your skin feels uncomfortable, a stronger formula may make the routine harder to maintain.
There is no need to increase strength simply because a higher number exists. Staying with a well-tolerated product is a reasonable choice when you are satisfied with your routine.
The formula includes hyaluronic acid, glycerin and vitamin E alongside retinal. Refer to your supplied packaging for the complete ingredient list and any allergens.
Ingredient selection matters, but tolerance depends on the whole formulation and how it is used. A hydrating formula can still cause irritation when applied too frequently or combined with several other active products.
Medik8 reports a 12-week study involving 33 participants using Crystal Retinal 6, with a 20% reduction in the appearance of wrinkles, 20% reduction in visible hyperpigmentation and 11% improvement in visible firmness.
These manufacturer-reported study findings describe the tested group; they do not predict an individual result. A percentage improvement in appearance does not mean that wrinkles or pigmentation disappeared.
New users should introduce application gradually: twice weekly for two weeks, alternate nights for two weeks, then nightly if tolerated. Follow your supplied directions.
If you are changing from another retinoid, avoid introducing several new products at the same time. This makes it easier to identify the cause of any irritation. Reduce frequency or pause if your skin becomes uncomfortable.
Keep cleansing gentle and use a moisturiser that suits your skin. For a lightweight cream option, see Obagi Hydrate Facial Moisturiser. You can also explore the Medik8 skincare collection to compare the products currently available.
Use broad-spectrum SPF 30 or higher during the day, alongside sensible sun protection. Avoid treating sunscreen as an optional extra when working on uneven pigmentation or visible signs of sun damage.
For external use only. Avoid eyes and broken or irritated skin. Keep out of reach of children. Follow the directions, storage instructions and period-after-opening information on your packaging.