ROUND LAB Birch Moisturizing Sunscreen UVLock SPF 45+ Broad Spectrum
68/100 overall score
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About this sunscreen
ROUND LAB Birch Moisturizing Sunscreen UVLock SPF 45+ Broad Spectrum is a chemical sunscreen on an older filter base of Butyl Methoxydibenzoylmethane, Homosalate, and Ethylhexyl Salicylate. It wears lightweight with a balanced finish and low white cast, and is generally low on pore-clogging potential. It does not commonly sting and works acceptably under makeup. With moderate protection and a score of 68.3/100, it is a comfortable everyday sunscreen with a dated filter set.
Ingredient & SPF scores
βοΈ
UV protection
Moderate
37
- +24 Butyl Methoxydibenzoylmethane at #8, UV filter (UVA1 +12.8)
- +9.6 Homosalate at #9, UV filter
- +6.4 Ethylhexyl Salicylate at #12, UV filter
- Γ0.9 Limited long-UVA1 coverage
- +1 Label claims (SPF 45)
β’οΈ
Health safety
Medium
57
- +100 Starting score
- β40 Homosalate at #9 (regulatory/evidence concern)
- β3.5 Avobenzone at #8, stacked (regulatory/evidence concern)
π€§
Allergens
Low
98
- +100 Starting score
- β2 Essential oils (Anthemis Nobilis Flower Oil)
π₯
Eye sting
Low
86
- +100 Starting score
- β8 Avobenzone at #8, migrates into eyes with sweat
- β3 Homosalate at #9, migrates into eyes with sweat
- β3 Octisalate at #12, migrates into eyes with sweat
π
Fungal acne
Medium
58
- +100 Starting score
- β42 3 long-chain (C12+) esters that feed Malassezia (Polyglyceryl-3 Distearate, Glyceryl Stearate Citrate, Sodium Stearoyl Glutamate)
π
Fabric stains
Low
62
- +100 Starting score
- β38 Avobenzone at #8, reacts with iron in wash water into rust-yellow stains
π§
Moisture
Balanced
LightNourishing
- β 1.5 1 sebum-absorbing powders (Polymethylsilsesquioxane)
- β 1 Glycerin at #22, the anchor humectant
- β 2 Sodium Hyaluronate at #24, hyaluronic family
- β 1 1 strong humectants (Glyceryl Glucoside)
β¨
Finish
Balanced
MatteDewy
- β 1 1 sebum-absorbing powders (Polymethylsilsesquioxane)
- β 3 1 dry-touch emollients reduce greasy shine (Caprylyl Methicone)
π
Makeup base
Okay
PillsPrimer
- β 3 Dry-touch esters, smooth fast-absorbing base
- β 1.5 Gel polymers prone to pilling under friction (Carbomer, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Poly C10-30 Alkyl Acrylate)
π
Water resistance
Resistant
Non-water-resistantWater-resistant
- +20 1 film-forming polymers that lock the formula on for water resistance
Skincare extras
Beneficial actives this formula contains. Informational only, not part of the rating: their effect depends on a concentration the label does not disclose.
- β¨ Vitamin E
- β¨ Niacinamide
Full ingredient list (41)
What each ingredient does and how it moves each rating: green helps, red hurts, β / β give the direction, and β / β shift a slider toward its ends (finish, moisture, makeup base). Auto-derived from our scoring rules and the ingredient's position.
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1 Water
Solvent base, the water phase
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Thickener and texture, structures the gel or cream
- β 20 film former
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Emollient, softens and smooths skin
- matte β 3 dry-touch emollient, anti-shine
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Botanical extract
-
Antioxidant, protects the formula and skin
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Soothing, skin-conditioning active
-
Emulsifier, keeps oil and water blended
- β 24 feeds malassezia
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Legacy UV filter (Avobenzone), low in the list, likely a minor contributor
- β 24 UV protection, incl. long-UVA (UVA1)
- β 3.5 stacked (regulatory/evidence concern)
- β 8 migrates into eyes with sweat
- β 38 reacts with iron in wash water into rust-yellow stains
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Legacy UV filter (Homosalate), low in the list, likely a minor contributor
- β 9.6 UV protection
- β 3 migrates into eyes with sweat
-
Colorant or pigment
-
Humectant, pulls water into the skin
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Legacy UV filter (Octisalate), low in the list, likely a minor contributor
- β 6.4 UV protection
- β 3 migrates into eyes with sweat
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Emollient, softens and smooths skin
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Thickener and texture, structures the gel or cream
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Fatty alcohol, an emollient and thickener, not the drying kind
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16 Tromethamine
pH adjuster
-
Emulsifier, keeps oil and water blended
- β 9 feeds malassezia
-
Botanical extract
-
Botanical extract
-
Botanical extract
-
Thickener and texture, structures the gel or cream
-
22 Glycerin
Humectant, pulls water into the skin
- 1 β nourishing the anchor humectant
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Humectant, pulls water into the skin
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Humectant, pulls water into the skin
- 2 β nourishing hyaluronic family
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25 Carbomer
Thickener and texture, structures the gel or cream
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Humectant, pulls water into the skin
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Humectant, pulls water into the skin
-
Emulsifier, keeps oil and water blended
- 1 β nourishing humectant
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29 Propanediol
Humectant, pulls water into the skin
-
Botanical extract
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31 Allantoin
Soothing, skin-conditioning active
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Botanical extract
-
Emulsifier, keeps oil and water blended
- β 9 feeds malassezia
-
Supporting ingredient
-
Supporting ingredient
-
Humectant, pulls water into the skin
-
Humectant, pulls water into the skin
-
Thickener and texture, structures the gel or cream
-
Filter booster, photostabilizes the UV filters or lifts their SPF
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Filter booster, photostabilizes the UV filters or lifts their SPF
-
Mattifying powder, absorbs oil and blurs the finish
- light β 1.5 sebum-absorbing powder
- matte β 1 sebum-absorbing powder
Does ROUND LAB Birch Moisturizing Sunscreen leave a white cast?
No, it is rated low for white cast and is lightweight with a balanced finish. It also works acceptably under makeup, so it suits daily wear.
Is the ROUND LAB Birch Moisturizing Sunscreen UVLock SPF 45+ Broad Spectrum good for oily or acne-prone skin?
It can suit oily and acne-prone skin. It is generally low on pore-clogging potential and has a non-greasy balanced finish, so it is commonly comfortable for everyday use.
Is it mineral or chemical?
It is a chemical sunscreen on an older filter base of Butyl Methoxydibenzoylmethane, Homosalate, and Ethylhexyl Salicylate.