The Formula rx Sun Relief Ceramide Silk Hydrating Sunscreen SPF 50 Versus Beauty of Joseon Daily Relief Sunscreen SPF 40
This hybrid sunscreen covers the full UV range and blocks ~98% of UVB at SPF 50.
This chemical sunscreen covers most of the UV range, lighter on the deep UVA that drives aging.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
Dicaprylyl Carbonate
EmollientPropanediol
Solvent
Butylene Glycol
Humectant
Diethylamino Hydroxybenzoyl Hexyl Benzoate
UV Filter
Titanium Dioxide
Cosmetic Colorant
Ethylhexyl Triazone
UV Absorber
Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
UV Absorber
Niacinamide
Smoothing
Glyceryl Stearate
Emollient
Cetearyl Alcohol
Emollient
Ceramide NP
Skin Conditioning
Ceramide AP
Skin Conditioning
Ceramide EOP
Skin Conditioning
Phytosphingosine
Skin Conditioning
Cholesterol
Emollient
Nonapeptide-1
Skin Conditioning
Linoleic Acid
Cleansing
Bisabolol
Antioxidant
Sodium Hyaluronate
Humectant
Panthenol
Skin Conditioning
Allantoin
Skin Conditioning
Sodium Lauroyl Lactylate
EmulsifyingXanthan Gum
EmulsifyingTocopheryl Acetate
Antioxidant
Carbomer
Emulsion StabilisingPhenoxyethanol
Preservative
Tocopherol
Antioxidant
Disodium EDTA
ChelatingLinolenic Acid
Cleansing
Ethylhexylglycerin
Skin ConditioningCI 77499
Cosmetic ColorantCI 77491
Cosmetic ColorantCI 77492
Cosmetic ColorantWater, Glycerin, Dicaprylyl Carbonate, Propanediol, Butylene Glycol, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Titanium Dioxide, Ethylhexyl Triazone, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Niacinamide, Glyceryl Stearate, Cetearyl Alcohol, Ceramide NP, Ceramide AP, Ceramide EOP, Phytosphingosine, Cholesterol, Nonapeptide-1, Linoleic Acid, Bisabolol, Sodium Hyaluronate, Panthenol, Allantoin, Sodium Lauroyl Lactylate, Xanthan Gum, Tocopheryl Acetate, Carbomer, Phenoxyethanol, Tocopherol, Disodium EDTA, Linolenic Acid, Ethylhexylglycerin, CI 77499, CI 77491, CI 77492
Water
Skin ConditioningHomosalate
Skin Conditioning
Butyloctyl Salicylate
Skin Conditioning
Octocrylene
UV Absorber
Ethylhexyl Salicylate
UV Absorber
Dipropylene Glycol
HumectantDiethylhexyl 2,6-Naphthalate
EmollientPolymethylsilsesquioxane
Butyl Methoxydibenzoylmethane
UV Absorber
Glycerin
Humectant
Caprylyl Methicone
Skin Conditioning
1,2-Hexanediol
Skin Conditioning
Silica
Abrasive
Vp/Eicosene Copolymer
Pentylene Glycol
Skin Conditioning
Behenyl Alcohol
Emollient
Poly C10-30 Alkyl Acrylate
Emulsion StabilisingPolyglyceryl-3 Methylglucose Distearate
Emulsifying
Cetearyl Alcohol
Emollient
Glyceryl Stearate
Emollient
Inulin Lauryl Carbamate
Emulsion StabilisingTromethamine
BufferingCarbomer
Emulsion StabilisingAcrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingSodium Stearoyl Glutamate
CleansingEthylhexylglycerin
Skin ConditioningPolyacrylate Crosspolymer-6
Emulsion StabilisingOryza Sativa Extract
Absorbent
T-Butyl Alcohol
Perfuming
Tocopherol
Antioxidant
Water, Homosalate, Butyloctyl Salicylate, Octocrylene, Ethylhexyl Salicylate, Dipropylene Glycol, Diethylhexyl 2,6-Naphthalate, Polymethylsilsesquioxane, Butyl Methoxydibenzoylmethane, Glycerin, Caprylyl Methicone, 1,2-Hexanediol, Silica, Vp/Eicosene Copolymer, Pentylene Glycol, Behenyl Alcohol, Poly C10-30 Alkyl Acrylate, Polyglyceryl-3 Methylglucose Distearate, Cetearyl Alcohol, Glyceryl Stearate, Inulin Lauryl Carbamate, Tromethamine, Carbomer, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Sodium Stearoyl Glutamate, Ethylhexylglycerin, Polyacrylate Crosspolymer-6, Oryza Sativa Extract, T-Butyl Alcohol, Tocopherol
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Carbomer is a synthetic thickening and gelling agent. It's basically the ingredient that gives a lot of serums, gels, creams, and sunscreens their smooth, non-sticky texture.
Although legally permitted at very high levels, carbomers are normally used at concentrations below 1%.
It also needs to be neutralized to actually thicken, and because it is a large molecule, it doesn't really penetrate the skin barrier.
Allergy-wise, the risk is very low. Clinical studies show carbomers have low potential for skin irritation/sensitization even at concentrations up to 100%.
A 2024 UK study patch-tested 1,302 patients and found true allergy to the parent group of carbomer to be rare with no confirmed relevant reactions.
Learn more about CarbomerCetearyl alcohol is a waxy mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is an emollient and emulsifier.
Despite having "alcohol" in its name, it has nothing to do with drying solvent alcohols; the FDA also allows "alcohol-free" products to contain fatty alcohols like this ingredient.
It plays several roles in a formula:
Typical use levels for this ingredient sit around 1-10% and the Cosmetic Ingredient Review Expert Panel has affirmed safety at concentrations up to 25% in leave-on products.
Multiple assessments have found it to be non-irritating and non-sensitizing to most people.
However, there have been some cases of allergic contact dermatitis in patients with chronically compromised skin barriers.
Cetearyl alcohol has a comedogenic rating of 2 and irritancy rating of 1. Both of these numbers come from the 1989 study that used rabbit ears; a "2" means mildly comedogenic and a "1" means low irritancy.
Here's the catch: rabbit skin is more sensitive than human skin and throws a lot of false positives. A 1996 reappraisal found that ingredients rated 1-2 in the rabbit ear tests are generally safe for humans.
Remember comedogenic ratings are unable to assess the entire formula of a product or how it will react on your skin. Just be sure to patch test if you are unsure about certain ingredients.
This ingredient is not fungal acne safe. Cetearyl alcohol is a fatty alcohol with chain lengths that fall within the range that Malassezia can metabolize.
A 2019 study has also observed Malassezia growth in the presence of this ingredient, confirming it to be not-fungal acne safe.
Learn more about Cetearyl AlcoholEthylhexylglycerin is created from glycerin. It is a multitasker ingredient that:
The CIR Expert Panel found minimal skin absorption or sensitization of any kind in a safety assessment. Though this ingredient is considered well-tolerated, a small number of cases of allergic dermatitis have been published since 2002. Just be sure to patch test if you are unsure.
Industry-reported use ranges from 8% in rinse-off products and 2% in leave-on formulations.
Learn more about EthylhexylglycerinGlycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.
Topically, glycerin does several things at once:
Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.
Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.
This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.
Just know very high concentrations (>40%) can feel tacky in low humidity.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinGlyceryl Stearate is made by reacting glycerin with stearic acid (typically sourced from plant oils like palm or coconut). It's an emulsifier, emollient, and mild occlusive.
Emulsifiers help ingredients like oil and water stay mixed so your formula stays nicely blended and uniform in texture.
This ingredient is typically used in concentrations between 1-10%. Studies have found it to be non-sensitizing, non-phototoxic, and non-photoallergenic.
A close cousin of this ingredient is Glyceryl Stearate SE ("self-emulsifying"). This just has a small amount of sodium or potassium stearate added so it can emulsify without a co-emulsifier.
Since this ingredient is an ester of a C18 fatty acid, it may not be fungal acne safe. The Malassezia yeast can potentially metabolize within the C11-C24 range.
Fun fact: The human body also creates Glyceryl Stearate naturally.
Learn more about Glyceryl StearateTocopherol is a fat-soluble antioxidant known as Vitamin E.
You'll find this ingredient in the vast majority of skincare (for good reason). It works to neutralize free radicals, or unstable molecules generated by UV exposure, pollution, and other environmental stressors, before they can cause oxidative damage to your skin cells.
Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.
It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.
This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.
This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.
In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.
Concentrations usually range from 0.1-1% in most leave-on products.
Learn more about TocopherolWater. 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. Remember to stay hydrated!
Learn more about Water
