Medik8

Crystal Retinal 1.

Retinoids

About this product

A retinaldehyde retinoid serum in a creamy formula, positioned as an entry-level strength in Medik8's tiered retinoid range, designed to deliver retinoid benefits with gentler acclimation than traditional retinols.

Full ingredients

Water, Caprylic/Capric Triglyceride, Glycerin, Isododecane, Cetearyl Olivate, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetearyl Alcohol, PPG-12/Smdi Copolymer, Sorbitan Olivate, Tocopheryl Acetate, Squalane, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Hydroxyacetophenone, Cyclodextrin, 3-O-Ethyl Ascorbic Acid, Sodium Polyaspartate, Hydroxypropyl Methylcellulose, Sodium Hyaluronate, Phenoxyethanol, Tetrahexyldecyl Ascorbate, Daucus Carota Sativa (Carrot) Seed Oil, Retinal, Alumina, Isostearic Acid, Lecithin, Polyglyceryl-3 Polyricinoleate, Polyhydroxystearic Acid, Lonicera Japonica (Honeysuckle) Flower Extract, Lonicera Caprifolium (Honeysuckle) Flower Extract, Stearic Acid, Citric Acid, BHT, Rubus Chamaemorus Seed Oil, Polysorbate 60, Disodium EDTA, Ethylhexylglycerin, Sorbitan Isostearate, Pentylene Glycol

Guru Score

86%

Yay

Early verdict · Few reviews so far

2Gurus

2Yay

0Mixed

0Nay

What they liked

Gentle enough to use on neck and sensitive areas
Fast acclimation compared to other retinoids
One pump covers entire face

What they flagged

Premium price point

What the gurus are saying

This retinaldehyde converts to retinoic acid in just one step, making it more efficient than retinol, and gurus find the acclimation unusually quick despite retinoids' reputation for weeks or months of adjustment. The creamy texture needs only one pump for the whole face, and people with sensitive skin can often use it nightly on delicate areas like the neck where prescription retinoids would be too harsh. That said, it sits at a luxury price point, so cost may be a consideration alongside the gentler strength.

Synthesized from 2 expert reviews · most recent take January 2026

Best for

Sensitive skinYounger skin

Type

RetinoidsLiquid

Key actives

Vitamin C Retinoid Hyaluronic acidVitamin ESqualane

Formula notes

Fragrance-freeNo drying alcohol

Where to buy

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What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Yay takes Nay takes Mixed takes Hide sponsored

Beyond50Skin

32k subs

✓Yay

"Medik8 Crystal Retinal 1 has a low percentage retinaldehyde which only requires one conversion in the skin to transform to retinoic acid, so it's a little bit more efficient. It's a great starter retinoid product. The formula is beautiful. It's creamy. It feels lovely on the skin. It is at a more luxury price."

Dr. Sam Ellis

882k subs

✓Yay

"Retinoids are notoriously irritating to the skin and can cause a lot of dryness and peeling with quite a long acclimation period somewhere between weeks and several months. The Medik8 Crystal Retinal 1 is exceptional because I find that you can acclimate to it quite quickly but it's also very very effective. [...] It is a retinal derivative product, so that's a step up in potency and efficacy from retinol, [...] but it's level one and this goes all the way up to level 20. I really like that Medik8 creates their retinoids in gradients so you can start with something less potent if you have sensitive skin or you're a beginner and then work your way up as you tolerate it. Retinal is traditionally tricky to formulate with, hard to keep stable and effective, but Medik8 has a great technology approach to this and their products with retinal are wonderful. [...] It's nice and creamy and you just need a really thin layer, one pump for your entire face. I really like this because you can use it on your neck. A lot of people can't use prescription retinoids on their neck because it's too irritating, but this one's fantastic. [...] Once someone with sensitive skin is able to tolerate this every single night on their skin without issues, then they could go up to the next strength."

Top Pick: retinoid

What the evidence says.

Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

Retinoids

Retinoids are among the best studied ingredients in dermatology, with solid evidence for acne and for the fine lines and rough texture that come from sun exposure. Dryness and flaking in the first few weeks are common and usually settle.

Source: DermNet

Vitamin C

Topical vitamin C is an antioxidant with reasonable evidence for dullness and uneven tone. It breaks down in light and air, so how a product is formulated and packaged matters as much as the percentage on the front.

Source: DermNet

Humectants and emollients

Ingredients like these draw water into the surface layers and slow how fast it leaves. The evidence is for comfort, softness and hydration rather than for changing the structure of the skin.

Source: DermNet

Frequently asked.

What is Medik8 Crystal Retinal 1?

Is Medik8 Crystal Retinal 1 worth it?

Yes. All 2 gurus who reviewed it give it their stamp of approval, for a Guru Score of 86%.

What is Medik8 Crystal Retinal 1's Guru Score?

Medik8 Crystal Retinal 1 holds a Guru Score of 86%. That is our read on how warmly the experts talk about it, based on the verdicts of 2 expert reviewers we have collected. At least one expert has named it a Top Pick in its category.