Sunday Riley A+ High-Dose Retinol Serum Versus Medik8 Crystal Retinal 6
Updated on January 29, 2025
Overview
What they are
These products are both cruelty-free serums. They have a total of 7 ingredients in common
Cool Features
They both contain hyaluronic acid, retinoid and Vitamin E
Suited For
They're both likely to be good for fighting acne, anti aging, dry skin, brightening skin, oily skin, reducing pores, scar healing, dark spots and better texture
Free From
They both do not contain any parabens or sulfates
What's Inside
They both contain fragrances and oils
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Sunday Riley A+ High-Dose Retinol Serum 55 ingredients
Medik8 Crystal Retinal 6 47 ingredients
About this product
About this product
At a glance
Click on any of the items below to learn more
Sunday Riley A+ High-Dose Retinol Serum 55 ingredients
Medik8 Crystal Retinal 6 47 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningPropanediol
SolventDimethyl Isosorbide
SolventTriheptanoin
Skin ConditioningDimethicone
Emollient
Glycerin
Humectant
Pentylene Glycol
Skin ConditioningHexyldecanol
EmollientDisiloxane
Skin Conditioning
Cetyl PEG/PPG-10/1 Dimethicone
Emulsifying
Diheptyl Succinate
EmollientPropylene Carbonate
SolventHydroxypinacolone Retinoate
Skin Conditioning
PPG-24-Glycereth-24
EmulsifyingPhenyl Trimethicone
Skin Conditioning
Retinol
Skin Conditioning
Ubiquinone
Antioxidant
Honey Extract
Humectant
Sodium Hyaluronate Crosspolymer
Humectant
Algae Extract
Emollient
Zingiber Officinale Extract
Skin ConditioningOpuntia Ficus-Indica Fruit Extract
Skin ConditioningBisabolol
Masking
Butyrospermum Parkii Butter
Skin Conditioning
Phospholipids
Skin ConditioningSaccharomyces Cerevisiae Extract
Skin ConditioningLecithin
EmollientSodium Acrylates Copolymer
Hydrogenated Polyisobutene
Emollient1,2-Hexanediol
Skin Conditioning4-T-Butylcyclohexanol
Masking
Polyglyceryl-10 Stearate
Skin Conditioning
Caprylyl Glycol
EmollientHelianthus Annuus Seed Oil
Emollient
Sorbitol
Humectant
Cetylhydroxyproline Palmitamide
Skin ConditioningPolysilicone-11
Benzoic Acid
Masking
Dehydroacetic Acid
Preservative
Sodium Phytate
Glyceryl Polyacrylate
Polysorbate 80
Emulsifying
Hydroxyphenyl Propamidobenzoic Acid
Skin ConditioningStearic Acid
Cleansing
Brassica Campestris Sterols
Emollient
Pvp
Emulsion StabilisingCapryloyl Glycerin/Sebacic Acid Copolymer
Skin ConditioningSodium Benzoate
Masking
Alcohol
Antimicrobial
Potassium Phosphate
BufferingDecyl Glucoside
CleansingPhenoxyethanol
Preservative
Hexylene Glycol
EmulsifyingPotassium Sorbate
Preservative
Tocopherol
Antioxidant
Water, Propanediol, Dimethyl Isosorbide, Triheptanoin, Dimethicone, Glycerin, Pentylene Glycol, Hexyldecanol, Disiloxane, Cetyl PEG/PPG-10/1 Dimethicone, Diheptyl Succinate, Propylene Carbonate, Hydroxypinacolone Retinoate, PPG-24-Glycereth-24, Phenyl Trimethicone, Retinol, Ubiquinone, Honey Extract, Sodium Hyaluronate Crosspolymer, Algae Extract, Zingiber Officinale Extract, Opuntia Ficus-Indica Fruit Extract, Bisabolol, Butyrospermum Parkii Butter, Phospholipids, Saccharomyces Cerevisiae Extract, Lecithin, Sodium Acrylates Copolymer, Hydrogenated Polyisobutene, 1,2-Hexanediol, 4-T-Butylcyclohexanol, Polyglyceryl-10 Stearate, Caprylyl Glycol, Helianthus Annuus Seed Oil, Sorbitol, Cetylhydroxyproline Palmitamide, Polysilicone-11, Benzoic Acid, Dehydroacetic Acid, Sodium Phytate, Glyceryl Polyacrylate, Polysorbate 80, Hydroxyphenyl Propamidobenzoic Acid, Stearic Acid, Brassica Campestris Sterols, Pvp, Capryloyl Glycerin/Sebacic Acid Copolymer, Sodium Benzoate, Alcohol, Potassium Phosphate, Decyl Glucoside, Phenoxyethanol, Hexylene Glycol, Potassium Sorbate, Tocopherol
Water
Skin ConditioningCaprylic/Capric Triglyceride
MaskingGlycerin
Humectant
Isododecane
EmollientCetearyl Olivate
Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingCetearyl Alcohol
Emollient
PPG-12/Smdi Copolymer
EmollientSorbitan Olivate
Emulsifying
Tocopheryl Acetate
Antioxidant
Titanium Dioxide
Cosmetic Colorant
Eclipta Prostrata Extract
Skin ConditioningCyclodextrin
AbsorbentSqualane
Emollient
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingPhenoxyethanol
Preservative
Melia Azadirachta Leaf Extract
Skin ConditioningHydroxypropyl Methylcellulose
Emulsion StabilisingSodium Hyaluronate
Humectant
Tetrahexyldecyl Ascorbate
Antioxidant
Rubus Chamaemorus Seed Oil
Skin Conditioning
Alumina
Abrasive
Isostearic Acid
Cleansing
Lecithin
EmollientPolyglyceryl-3 Polyricinoleate
Emulsifying
Polyhydroxystearic Acid
Emulsifying
Stearic Acid
Cleansing
Pentylene Glycol
Skin ConditioningRetinal
Skin Conditioning
Moringa Oleifera Seed Oil
Emollient
Sodium Polyaspartate
HumectantClimbazole
Antimicrobial
Disodium EDTA
Lonicera Japonica Flower Extract
Skin ConditioningLonicera Caprifolium Flower Extract
Perfuming
Daucus Carota Sativa Seed Oil
Emollient
Ethylhexylglycerin
Skin Conditioning3-O-Ethyl Ascorbic Acid
Skin Conditioning
Dipteryx Odorata Bean Extract
Masking
Hydroxyacetophenone
Antioxidant
Polysorbate 60
Emulsifying
Sorbitan Isostearate
Emulsifying
Vanilla Planifolia Fruit Extract
Skin ConditioningDecylene Glycol
Skin Conditioning1,2-Hexanediol
Skin ConditioningBHT
Antioxidant
Coumarin
Perfuming
Water, Caprylic/Capric Triglyceride, Glycerin, Isododecane, Cetearyl Olivate, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetearyl Alcohol, PPG-12/Smdi Copolymer, Sorbitan Olivate, Tocopheryl Acetate, Titanium Dioxide, Eclipta Prostrata Extract, Cyclodextrin, Squalane, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Phenoxyethanol, Melia Azadirachta Leaf Extract, Hydroxypropyl Methylcellulose, Sodium Hyaluronate, Tetrahexyldecyl Ascorbate, Rubus Chamaemorus Seed Oil, Alumina, Isostearic Acid, Lecithin, Polyglyceryl-3 Polyricinoleate, Polyhydroxystearic Acid, Stearic Acid, Pentylene Glycol, Retinal, Moringa Oleifera Seed Oil, Sodium Polyaspartate, Climbazole, Disodium EDTA, Lonicera Japonica Flower Extract, Lonicera Caprifolium Flower Extract, Daucus Carota Sativa Seed Oil, Ethylhexylglycerin, 3-O-Ethyl Ascorbic Acid, Dipteryx Odorata Bean Extract, Hydroxyacetophenone, Polysorbate 60, Sorbitan Isostearate, Vanilla Planifolia Fruit Extract, Decylene Glycol, 1,2-Hexanediol, BHT, Coumarin
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterGlycerin is already naturally found in your skin. It helps moisturize and protect your skin.
A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.
As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.
Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.
Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.
In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.
This ingredient is organic, colorless, odorless, and non-toxic.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinPentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.
The hydrophilic trait of Pentylene Glycol makes it a humectant. As a humectant, Pentylene Glycol helps draw moisture from the air to your skin. This can help keep your skin hydrated.
This property also makes Pentylene Glycol a great texture enhancer. It can also help thicken or stabilize a product.
Pentylene Glycol also acts as a mild preservative and helps to keep a product microbe-free.
Some people may experience mild eye and skin irritation from Pentylene Glycol. We always recommend speaking with a professional about using this ingredient in your routine.
Pentylene Glycol has a low molecular weight and is part of the 1,2-glycol family.
Learn more about Pentylene GlycolLecithin is a term for a group of substances found in the cell membranes of plants, animals, and humans. They are made up of mixture of phospholipids.
This ingredient has emollient and emulsifying properties.
As an emollient, lecithen helps soften the skin and creates a barrier to keep moisture in.
As an emulsifier, it also helps prevent water and oil ingredients from separating. Lecithin can also help ingredients be better absorbed by the skin.
This is because the phospholipids in lecithin produce liposomes. Liposomes help other ingredients get through the skin barrier.
Depending on the source of this ingredient, lecithin may not be fungal acne safe. This is because some sources of lecithin come from soybean oil, which may feed the malassezia yeast that feeds fungal acne.
We recommend reaching out to the brand you are purchasing from to inquire about the source of their lecithin.
Learn more about Lecithin1,2-Hexanediol is a synthetic liquid and another multi-functional powerhouse.Â
It is a:
- Humectant, drawing moisture into the skin
- Emollient, helping to soften skin
- Solvent, dispersing and stabilizing formulas
- Preservative booster, enhancing the antimicrobial activity of other preservativesÂ
Stearic Acid is a fatty acid. It is an emollient, emulsifier, and texture enhancer.
As an emollient, stearic acid helps soften skin. It aids the skin's protective barrier by preventing water loss. It also provides a gentle cleansing effect without stripping away natural oils.
Stearic acid may also be used to enhance the texture of products. It can add volume and stabilize ingredients such as water and oil. This can help water and oil ingredients from separating.
Sources of stearic acid include animal or vegetable fats/oils such as coconut or shea. It can be naturally found in butter, cocoa butter, shea butter, vegetable fats, and animal tallow.
This ingredient may not be Malassezia folliculitis, or fungal-acne safe.
Learn more about Stearic AcidPhenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.
It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.
Ingredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Sunday Riley A+ High-Dose Retinol Serum 55 ingredients
Medik8 Crystal Retinal 6 47 ingredients
Reviews
Here's what our community thinks
Sunday Riley A+ High-Dose Retinol Serum 55 ingredients
Definitely high-dose retinol!
This is a powerful retinol serum that is no joke. I tried easing into it by going every other night, then moved to every night. I ended up with signs of a damaged skin barrier (redness) on my chin. I'm going to lay off this on my chin for a couple weeks, then try again, but stick to every other night. I like that I'm getting a strong dose of an excellent skincare Show more
Medik8 Crystal Retinal 6 47 ingredients
Just about safe enough for me to use on my forehead and the tops of my cheeks, but any further down my face/neck it causes massive breakouts and fungal acne which takes months to get rid of. For the price, it's just not worth it.
Great retinal serum but not for dry skin. Could be a little bit irritating too! The price is also mindblowing! Too expensive! It has a nice vanilla like scent
