Altruist Dermatologist Face Fluid Sunscreen SPF 50 Versus Eucerin Advanced Hydration Lightweight Sunscreen Lotion SPF50
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 ConditioningC12-15 Alkyl Benzoate
AntimicrobialButyl Methoxydibenzoylmethane
UV Absorber
Ethylhexyl Salicylate
UV Absorber
Ethylhexyl Stearate
Emollient
Glycerin
Humectant
Niacinamide
Smoothing
Octocrylene
UV Absorber
Dimethicone
Emollient
Titanium Dioxide
Cosmetic Colorant
Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
Skin Conditioning
Phenylbenzimidazole Sulfonic Acid
UV Absorber
Sodium Stearoyl Glutamate
CleansingEthylhexyl Triazone
UV Absorber
Panthenol
Skin Conditioning
Aminomethyl Propanol
BufferingCetearyl Alcohol
Emollient
Glyceryl Stearate
Emollient
Phenoxyethanol
Preservative
Alumina
Abrasive
Tocopheryl Acetate
Antioxidant
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingSimethicone
Emollient
Caprylyl Glycol
Emollient
Piroctone Olamine
Preservative
Silver Chloride
Preservative
Diethylhexyl Sodium Sulfosuccinate
CleansingPropylene Glycol
Humectant
Water, C12-15 Alkyl Benzoate, Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Ethylhexyl Stearate, Glycerin, Niacinamide, Octocrylene, Dimethicone, Titanium Dioxide, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Phenylbenzimidazole Sulfonic Acid, Sodium Stearoyl Glutamate, Ethylhexyl Triazone, Panthenol, Aminomethyl Propanol, Cetearyl Alcohol, Glyceryl Stearate, Phenoxyethanol, Alumina, Tocopheryl Acetate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Simethicone, Caprylyl Glycol, Piroctone Olamine, Silver Chloride, Diethylhexyl Sodium Sulfosuccinate, Propylene Glycol
Butyl Methoxydibenzoylmethane 3%
UV Absorber
Homosalate 9%
Skin Conditioning
Ethylhexyl Salicylate 4.5%
UV Absorber
Octocrylene 9%
UV Absorber
Water
Skin ConditioningC12-15 Alkyl Benzoate
AntimicrobialNeopentyl Glycol Diheptanoate
EmollientStyrene/Acrylates Copolymer
Butylene Glycol
Humectant
Diethylhexyl Syringylidenemalonate
Skin Protecting
Vp/Eicosene Copolymer
Sodium Hyaluronate
Humectant
Glycyrrhiza Inflata Root Extract
Skin Conditioning
Glycyrrhetinic Acid
Skin Conditioning
Tocopherol
Antioxidant
Aloe Barbadensis Leaf Juice
Skin Conditioning
1,2-Hexanediol
Skin Conditioning
Hydroxyacetophenone
Antioxidant
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingPotassium Hydroxide
BufferingDisodium EDTA
Sodium Ascorbyl Phosphate
Antioxidant
Butyl Methoxydibenzoylmethane 3%, Homosalate 9%, Ethylhexyl Salicylate 4.5%, Octocrylene 9%, Water, C12-15 Alkyl Benzoate, Neopentyl Glycol Diheptanoate, Styrene/Acrylates Copolymer, Butylene Glycol, Diethylhexyl Syringylidenemalonate, Vp/Eicosene Copolymer, Sodium Hyaluronate, Glycyrrhiza Inflata Root Extract, Glycyrrhetinic Acid, Tocopherol, Aloe Barbadensis Leaf Juice, 1,2-Hexanediol, Hydroxyacetophenone, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Potassium Hydroxide, Disodium EDTA, Sodium Ascorbyl Phosphate
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Acrylates/C10-30 Alkyl Acrylate Crosspolymer is a synthetic polymer. It is used to thicken, emulsify, and improve the texture of products.
As an emulsifier, it helps stabilize oil-in-water emulsions to give products an elegant feel when applied.
It can also form a thin protective film on skin. One study found that a formula using this polymer helped slow down how quickly other ingredients (like DEET) were absorbed through skin.
A 2024 study of over 1,300 patients confirmed that sensitization to this ingredient is rare. It is also non-mutagenic and has a clean track record.
Learn more about Acrylates/C10-30 Alkyl Acrylate CrosspolymerAlso known as Avobenzone, this ingredient is an oil-soluble used to absorb the full spectrum of UVA rays (peak 357 nm).
It's one of the most effective UVA filters available but has a major caveat of photostability: avobenzone is susceptible to photodegradation.
This means it can lose efficacy when exposed to sunlight without the help of a stabilizing agent.
Studies show antioxidants (like vitamin E or vitamin C) and some UV filters (like octocrylene and Tinosorb S) can meaningfully improve its stability in a formulation.
The maximum allowable concentration according to regulation is 3% in the US + Canada, and 5% in the EU, Australia, China, Korea, and ASEAN countries.
It has a well-support safety profile: a comprehensive 2025 review found minimal toxicity with no evidence of carcinogenicity.
Overall, avobenzone is a safe and regulated ingredient used in sunscreen for over 40 years.
Learn more about Butyl MethoxydibenzoylmethaneC12-15 Alkyl Benzoate is a lightweight emollient made by combinig benzoic acid with fatty alcohols that are 12-15 carbons long.
In cosmetics, it plays several roles:
The Cosmetic Review Expert Panel has concluded the alkyl benzoate group to be safe as used in cosmetics; it wasn't found to be a skin irritant and unlikely to be absorbed due to its low water solubility.
This report recorded almost 1000 reported uses with concentrations up to 59% in leave-on products but your cosmetics will typically use 0.5-15% depending on the product.
It's often called a "SPF booster": this is because it keeps UV filters properly dissolved and evenly distributed to support a sunscreen's performance. It doesn't actually raise SPF on its own.
Overall, this ingredient is well tolerated.
This ingredient is fungal acne safe because it is an ester of benzoic acid.
Think of this ingredient as two parts stuck together: an oily part and an acid part. Malassezia only gets a meal when it can snip off a fatty acid to eat. With C12-15 Alkyl Benzoate, the acid part is benzoic acid, which isn't a fatty acid and which the yeast can't use as food.
Benzoic acid is actually used as a preservative to stop yeast from growing.
The oily part is a blend of C12-15 fatty alcohols but fatty alcohols in this size range can support only a little Malassezia growth (mostly for one species of Malassezia as well).
In the ingredient, those alcohols stay locked inside the molecule. The yeast can only reach them by snipping the benzoate bond, and that type of bond is harder for it to cut than a normal fatty bond.
So not much gets released. And whatever does get snipped comes packaged with benzoic acid, which discourages yeast growth.
Learn more about C12-15 Alkyl BenzoateEthylhexyl Salicylate (also called Octisalate or Octyl Salicylate) is an oil-soluble organic UV filter that's been used in sunscreen since the 1950's.
It absorbs UVB light in the 280-320 nm range with a peak absorbance around 306 nm.
You'll often see it paired with other UV filters to boost overall SPF because octisalate is a fairly week filter on its own.
The reason you'll see it so often is because it can help solubilize and stabilize the trickier filters like oxybenzone and avobenzone.
Unlike these filters, octisalate has pretty good photostability and doesn't create skin-damaging free radicals when exposed to sunlight.
The fatty-alcohol part of the molecule also gives it a light, emollient feel so it doubles as a nice texture enhancer.
Usage levels vary around the world:
Safety-wise, this ingredient has a pretty reassuring track record. The EU's Scientific Committee on Consumer Products (SCCP) found very low skin penetration in human skin tests and negative results for irritation, phototoxicity, and photoallergy.
The real-world allergy risk is pretty low too; a 2012 European study of 1,031 people recorded only 2 reactions to it (a rate of 0.19%).
You might have seen scary headlines about sunscreen getting into your blood.
In 2019, the FDA found that several chemical filters can absorb through the skin and show up in the bloodstream at small but measurable levels.
Here's the important part: these tiny levels are just a cutoff the FDA uses to decide which ingredients need more testing and doesn't mean anything harmful was found.
The researchers were clear that the results are no reason to stop wearing sunscreen.
Learn more about Ethylhexyl SalicylateOctocrylene is an oil-soluble organic UV filter that mainly absorbs UVB and short wave UVA II light.
Its real superpower is teamwork: octocrylene is remarkably photostable and is most famous for stabilizing avobenzone (the workhorse UVA filter).
This ingredient is commonly used to enhance both UVB and UVA protection due to its unique property in stabilizing avobenzone. It also pulls double duty by boosting water resistance and giving formulas a smooth, spreadable feel.
The EU's Scientific Committee on Consumer Safety (SCCS) has deemed octocrylene to be safe as a UV-filter at concentrations up to 10% (capped at 9% in propellant sprays). The US also permits it up to 10%.
Two things worth knowing:
You'll usually see this ingredient used in concentrations between 2-10% (higher amounts when used as a stabilizer for avobenzone).
Learn more about OctocryleneWater. 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
