Round Lab
Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++
face sunscreen
Round Lab
face sunscreen
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Fit by skin type
General, ingredient-based — not your personalized match.
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Take the skin testA refreshing, hydrating sun stick that makes daily SPF easy. This clear, non-greasy formula glides on smoothly for lightweight UV protection with a soft, dewy finish. Infused with birch sap from Korea’s Inje region, it helps calm, hydrate, and strengthen the skin barrier while shielding against UV damage with SPF 50+ PA++++ protection.
Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++ is a cushioning sunscreen from Round Lab, a brand based in Korea. It is rated SPF 50+ PA++++, meaning it is tested to the top of both the UVB and the UVA scales used in Asia. Its job is UV protection, with the rest of the formula working on hydration. The ingredient list runs to 47 ingredients, each broken down in full below.
By its ingredient list the formula reads as moderately cushioned — emollient enough to feel like a cream, without the heaviest occlusives near the top. It contains both silicones and oils, a combination that usually finishes smooth and slightly satin and sits well under makeup. Hydration is handled by Butylene Glycol, Glycerin and Sodium Hyaluronate, humectants that pull water into the upper layers of skin rather than sealing it there.
It is a chemical (organic-filter) sunscreen, using Homosalate, Octocrylene and Avobenzone. Between them those filters cover UVB, UVA II and UVA I, so the formula is broad-spectrum in the meaningful sense: it reaches past 340 nm, where the ageing wavelengths sit. The formula contains a photounstable filter alongside a stabiliser, which is the standard and effective way to keep it from degrading in sunlight.
Hydration: High. Ingredients that pull and hold water in the upper layers of skin, and here that comes from Butylene Glycol, Glycerin, Sodium Hyaluronate and Hyaluronic Acid.
Soothing: Moderate. Ingredients aimed at visible redness and reactivity, and here that comes from Phenethyl Benzoate, Ethylhexyl Isononanoate, Allantoin and Artemisia Annua Extract.
On richness alone it suits Balanced skin best, and is the least natural fit for Combination (oily) and Oily skin. Nothing in the list is flagged as a common irritant, which is a reasonable starting point for reactive skin — though a patch test is still the only way to know.
The formula contributes little or nothing on barrier support, antioxidant protection, oil control and cell renewal. That is not a fault — most products are not meant to do everything — but if one of those is your priority, this is not the product that will address it.
Reading the full list, the formula is fragrance-free, no drying alcohol, paraben-free, sulfate-free, dye-free and no animal-derived ingredients. Those claims come from the ingredient list itself, not from the packaging. It does contain essential oils, worth knowing if your skin reacts to any of them.
Use it in the morning. In a routine it goes final morning step, before makeup. Apply about two finger-lengths for the face and neck — under-application is the single most common reason sunscreen underperforms. Reapply every two hours of sun exposure, and after swimming or towelling off. Let it set for a couple of minutes before makeup so it does not pill.
This summary is generated from the product's ingredient list. It is not a review, it is not the brand's own marketing claims, and it does not replace advice from a dermatologist.
Drawn purely from the ingredient list
Scored on how rich or light the formula reads from its INCI order.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
Based on the curated benefits documented for this product's ingredients.
Attracts and locks in moisture to keep skin plump and dewy
Boosts collagen and cell turnover to reduce fine lines and wrinkles
Calms redness, irritation, and inflammation for sensitive skin
Fades hyperpigmentation and evens out dark spots over time
Brightens and balances complexion for a more uniform appearance
None of the ingredients in this formula are associated with these benefits. This is not unusual, as most products are designed to target a limited number of concerns.
Chemical (organic) filter system · broad-spectrum through UVA I
Another solvent-filter: modest UVB coverage, mostly there to carry other filters.
Mostly present to stabilise avobenzone rather than for its own modest UVB coverage. Degrades slowly into benzophenone over a product's shelf life.
The workhorse UVA filter, and the fragile one: it loses a large share of its protection within an hour of sun unless the formula pairs it with a stabiliser such as octocrylene or Tinosorb S.
The actives, UV filters and benefit-carrying ingredients in this formula, in the order they are listed.
1st on the list. Regulation caps it at 7.34%, so it is present at roughly 3.67–7.34%.
Benzoic acid, 2-hydroxy-, 3,3,5-trimethylcyclohexyl ester
2nd on the list. Regulation caps it at 10%, so it is present at roughly 5–10%.
2-Cyano-3,3-Diphenyl Acrylic Acid 2-Ethylhexyl Ester
4th on the list. Regulation caps it at 5%, so it is present at roughly 2–5%.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
6th on the list, which puts it at an estimated 2–10% of the formula.
Dimethicone
10th on the list, which puts it at an estimated 1–5% of the formula.
Benzoic acid, 2-hydroxy-, 2-butyloctyl ester
11th on the list, which puts it at an estimated 1–3% of the formula.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
12th on the list, which puts it at an estimated 1–3% of the formula.
Isopropyl palmitate
14th on the list, which puts it at an estimated 1–3% of the formula.
Bis(16-methylheptadecyl) malate
15th on the list, which puts it at an estimated 1–3% of the formula.
2-Ethylhexyl isononanoate
27th on the list, which puts it at an estimated 1–3% of the formula.
Artemisia Annua Extract is an extract of the whole herb, Artemisia annua L., Compositae
31st on the list, which puts it at an estimated 1–3% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
32nd on the list, which puts it at an estimated 1–3% of the formula.
.alpha.-d-Glucopyranosiduronic acid, (3.beta.,20.beta.)-20-carboxy-11-oxo-30-norolean-12-en-3-yl 2-O-.beta.-d-glucopyranuronosyl-, dipotassium salt
Each axis is scored from the ingredients present and how high up the list they sit.
Ingredients that pull and hold water in the upper layers of skin
Lipids and repair signals that support skin barrier integrity
Ingredients that mop up free radicals from UV and pollution
Ingredients that moderate sebum or absorb shine
Ingredients that act on uneven tone and post-inflammatory marks
Ingredients aimed at visible redness and reactivity
Retinoids, acids and enzymes that speed surface turnover
Peptides and growth factors that signal for collagen support
A photounstable filter is present, paired with a stabiliser
"Active" here means an ingredient carrying a recorded active type or a recognised UV filter.
Solvents, emollients, texture agents and preservatives — the formula that carries the actives.
Read from the full ingredient list. A brand's own claim may differ.
Pinus Sylvestris Leaf Oil, Anthemis Nobilis Flower Oil
Dimethicone, Diphenylsiloxy Phenyl Trimethicone, Caprylyl Trimethicone, Polymethylsilsesquioxane, Dimethicone/vinyl Dimethicone Crosspolymer
Methyl Methacrylate Crosspolymer, Polymethylsilsesquioxane, Ethylene/propylene Copolymer
Camellia Japonica Seed Oil
Judged by the same curated rules our routine checker uses. It reads the ingredients, not the label.
Best kept to separate routines — one in the morning, one at night, or on alternate days.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
This product is the "Protect" step.
Flags to check, not verdicts. None of this is medical advice — if you are pregnant, breastfeeding or treating a skin condition, ask a doctor.
Most ingredients do more than one job, so these counts add up to more than the 47 ingredients on the label.
Sets the thickness, spread and stability of the formula
Softens and smooths by filling gaps between skin cells
Forms a film that slows water loss
Draws water into the upper layers of skin
Botanical material, usually for antioxidants or scent
Dissolves and carries everything else
Absorbs or scatters ultraviolet light
Changes how skin behaves rather than how it feels
Loosens or dissolves dead surface cells
Neutralises free radicals from UV and pollution
Lifts oil and dirt, or holds oil and water together
Calms visible redness and irritation
Sets the acidity the formula needs to work
Every ingredient on the label, in order, with what it does and roughly how much of it is likely to be there.
1st on the list. Regulation caps it at 7.34%, so it is present at roughly 3.67–7.34%.
Benzoic acid, 2-hydroxy-, 3,3,5-trimethylcyclohexyl ester
2nd on the list. Regulation caps it at 10%, so it is present at roughly 5–10%.
2-Cyano-3,3-Diphenyl Acrylic Acid 2-Ethylhexyl Ester
3rd on the list, which puts it at an estimated 5–20% of the formula.
1H-Pyrazole-4,5-Diamine, 1-(1-Methylethyl)-, Sulfate
4th on the list. Regulation caps it at 5%, so it is present at roughly 2–5%.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
5th on the list, which puts it at an estimated 2–10% of the formula.
Carbonic Acid, Bis(2- Ethylhexyl) Ester
6th on the list, which puts it at an estimated 2–10% of the formula.
Dimethicone
7th on the list, which puts it at an estimated 1–5% of the formula.
2-Propenoic acid, 2-methyl-, 1,2-ethanediyl ester, polymer with methyl 2-methyl-2-propenoate
8th on the list, which puts it at an estimated 1–5% of the formula.
Synthetic Wax is a hydrocarbon wax derived generally through Fischer-Tropsch or ethylene polymerization processes.
9th on the list, which puts it at an estimated 1–5% of the formula.
Silicones and siloxanes, diphenyl, trimethylsilyloxy phenyl, trimethylsilyl terminated
10th on the list, which puts it at an estimated 1–5% of the formula.
Benzoic acid, 2-hydroxy-, 2-butyloctyl ester
11th on the list, which puts it at an estimated 1–3% of the formula.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
12th on the list, which puts it at an estimated 1–3% of the formula.
Isopropyl palmitate
13th on the list, which puts it at an estimated 1–3% of the formula.
Benzoic acid, 2-phenylethyl ester
14th on the list, which puts it at an estimated 1–3% of the formula.
Bis(16-methylheptadecyl) malate
15th on the list, which puts it at an estimated 1–3% of the formula.
2-Ethylhexyl isononanoate
16th on the list, which puts it at an estimated 1–3% of the formula.
Pentasiloxane, 1,1,1,9,9,9-hexamethyl-3,5,7-trioctyl-3,5,7-tris[(trimethylsilyl)oxy)]-
17th on the list, which puts it at an estimated 1–3% of the formula.
Fluorphlogopite, Mg3K[AlF2O(SiO3)3] (synthetic)
18th on the list, which puts it at an estimated 1–3% of the formula.
Bis-Behenyl/Isostearyl/Phytosteryl Dimer Dilinoleyl Dimer Dilinoleate is Dimer Dilinoleyl Dimer Dilinoleate end-capped with a mixture of Phytosterol, Behenyl Alcohol and Isostearyl Alcohol
19th on the list, which puts it at an estimated 1–3% of the formula.
Polymer formed by hydrolysis and condensation of methyltrimethoxysilane
20th on the list, which puts it at an estimated 1–3% of the formula.
Homopolymer of ethylene monomers
21st on the list, which puts it at an estimated 1–3% of the formula.
Dimethicone/Vinyl Dimethicone Crosspolymer is a crosslinked dimethyl siloxane polymer (silicone elastomer) that is formed by the reaction between Hydrogen Dimethicone or Bis-Hydrogen Dimethicone, and Vinyl Dimethicone or Bis-Vinyldimethicone.
22nd on the list, which puts it at an estimated 1–3% of the formula.
Camellia Japonica Seed Oil is the fixed oil expressed from the seeds of the Camellia, Camellia japonica L., Theaceae
23rd on the list, which puts it at an estimated 1–3% of the formula.
Ethene, polymer with propene
24th on the list, which puts it at an estimated 1–3% of the formula.
Silane, dichlorodimethyl-, reaction products with silica
25th on the list, which puts it at an estimated 1–3% of the formula.
Siloxanes and silicones, di-Me, crosspolymers with C3-20 alkyl groups
26th on the list, which puts it at an estimated 1–3% of the formula.
Candelilla Wax Esters is the ester fraction derived from Euphorbia Cerifera (Candelilla) Wax;
27th on the list, which puts it at an estimated 1–3% of the formula.
Artemisia Annua Extract is an extract of the whole herb, Artemisia annua L., Compositae
28th on the list, which puts it at an estimated 1–3% of the formula.
Copernicia Cerifera (Carnauba) Wax is a wax obtained from the leaves and leaf buds of Copernicia cerifera, Palmaceae.
29th on the list, which puts it at an estimated 1–3% of the formula.
Pinus Sylvestris Leaf Oil is the volatile oil obtained from the needles of the Scotch Pine, Pinus sylvestris L., Pinaceae
30th on the list, which puts it at an estimated 1–3% of the formula.
Chamomile Oil-Roman. Anthemis Nobilis Flower Oil is the volatile oil distilled from the dried flower heads of the Roman Chamomile, Anthemis nobilis L., Asteraceae
31st on the list, which puts it at an estimated 1–3% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
32nd on the list, which puts it at an estimated 1–3% of the formula.
.alpha.-d-Glucopyranosiduronic acid, (3.beta.,20.beta.)-20-carboxy-11-oxo-30-norolean-12-en-3-yl 2-O-.beta.-d-glucopyranuronosyl-, dipotassium salt
33rd on the list, which puts it at an estimated 1–3% of the formula.
Urea, (2,5-dioxo-4-imidazolidinyl)-
34th on the list, which puts it at an estimated 1–3% of the formula.
alpha-D-Glucopyranoside, 2-Hydroxy-1-(Hydroxymethyl)ethyl
35th on the list, which puts it at an estimated 1–3% of the formula.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
36th on the list, which puts it at an estimated 1–3% of the formula.
Glycerine ;Glycerol (INN); Glycerol (RIFM); Glycerolum (EP); Glycyl Alcohol; 1,2,3-Propanetriol; 1,2,3-Trihydroxypropane
37th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
38th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Betula Platyphylla Japonica Juice is the sap from the tree, Betula platyphylla japonica, Betulaceae
39th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Ulmus Davidiana Root Extract is an extract of the root bark of the Elm, Ulmus davidiana, Ulmaceae
40th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Aloe Barbadensis Leaf Extract is an extract of the leaves of the aloe, Aloe barbadensis, Liliaceae
41st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Dioscorea Japonica Root Extract is an extract of the roots of Dioscorea japonica, Dioscoreaceae
42nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Viola Mandshurica Flower Extract is the extract obtained from the flowers of the plant Manchuria Violet, Viola mandshurica, Violaceae
43rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Laminaria Japonica Extract is an extract of the Japan Kelp/Seaweed, Laminaria japonica, Laminariaceae
44th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Octanoic acid, monoester with glycerol
45th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Hyaluronic acid, sodium, salt
46th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Hyaluronic acid
47th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Ascorbic acid
Products in the same category that share this formula's distinguishing ingredients.
Round Lab
Shares 8 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Butyl Methoxydibenzoylmethane, Homosalate, Water, Butyloctyl Salicylate, Artemisia Annua Extract
SOME BY MI
Shares 8 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Water, Homosalate, Octocrylene, Avobenzone, Butyloctyl Salicylate
Abib
Shares 7 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Dimethicone, Homosalate, Octocrylene, Isopropyl Palmitate, Diisostearyl Malate
Abib
Shares 7 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Diisostearyl Malate, Butyloctyl Salicylate, Water, Sodium Hyaluronate, Homosalate
COSRX
Shares 7 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Water, Octocrylene, Homosalate, Butyloctyl Salicylate, Butyl Methoxydibenzoylmethane
COSRX
Shares 7 key ingredients with Birch Juice Moisturizing UVLock Sun Stick SPF 50+ PA++++: Water, Octocrylene, Homosalate, Butyloctyl Salicylate, Butyl Methoxydibenzoylmethane
HOMOSALATE, OCTOCRYLENE, N-ISOPROPYL 4,5-DIAMINO PYRAZOLE SULFATE, Avobenzone, DIETHYLHEXYL CARBONATE, DIMETHICONE, METHYL METHACRYLATE CROSSPOLYMER, SYNTHETIC WAX, DIPHENYLSILOXY PHENYL TRIMETHICONE, BUTYLOCTYL SALICYLATE, BUTYL METHOXYDIBENZOYLMETHANE, ISOPROPYL PALMITATE, PHENETHYL BENZOATE, DIISOSTEARYL MALATE, ETHYLHEXYL ISONONANOATE, CAPRYLYL TRIMETHICONE, SYNTHETIC FLUORPHLOGOPITE, BIS-BEHENYL/ISOSTEARYL/PHYTOSTERYL DIMER DILINOLEYL DIMER DILINOLEATE, POLYMETHYLSILSESQUIOXANE, POLYETHYLENE, DIMETHICONE/VINYL DIMETHICONE CROSSPOLYMER, CAMELLIA JAPONICA SEED OIL, ETHYLENE/PROPYLENE COPOLYMER, SILICA DIMETHYL SILYLATE, DIMETHICONE CROSSPOLYMER, CANDELILLA WAX ESTERS, ARTEMISIA ANNUA EXTRACT, COPERNICIA CERIFERA WAX, PINUS SYLVESTRIS LEAF OIL, ANTHEMIS NOBILIS FLOWER OIL, WATER, DIPOTASSIUM GLYCYRRHIZATE, ALLANTOIN, GLYCERYL GLUCOSIDE, BUTYLENE GLYCOL, GLYCERIN, 1,2-HEXANEDIOL, BETULA PLATYPHYLLA JAPONICA JUICE, ULMUS DAVIDIANA ROOT EXTRACT, ALOE BARBADENSIS LEAF EXTRACT, DIOSCOREA JAPONICA ROOT EXTRACT, VIOLA MANDSHURICA FLOWER EXTRACT, LAMINARIA JAPONICA EXTRACT, GLYCERYL CAPRYLATE, SODIUM HYALURONATE, HYALURONIC ACID, ASCORBIC ACID.
SODIUM HYALURONATE, HYALURONIC ACID, ASCORBIC ACID.
Turn the dial at the bottom. Apply evenly on areas prone to UV exposure
Judged on how rich the formula reads from its ingredient list, it suits Balanced skin best. It is the least natural fit for Combination (oily), Oily skin.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
6 ingredients could feed malassezia: Isopropyl Palmitate, Bis-behenyl/isostearyl/phytosteryl Dimer Dilinoleyl Dimer Dilinoleate, Camellia Japonica Seed Oil, Pinus Sylvestris Leaf Oil, Anthemis Nobilis Flower Oil, Glyceryl Caprylate. That describes the yeast's food supply, not a prediction that they will cause a breakout.
Nothing in this formula is on the standard pregnancy-caution list. That is not medical clearance — check anything you use daily with your doctor or midwife.
Yes. Reading the full ingredient list, this formula is fragrance-free.
No. Reading the full ingredient list, this formula is no drying alcohol.
No — it contains Dimethicone, Diphenylsiloxy Phenyl Trimethicone, Caprylyl Trimethicone, Polymethylsilsesquioxane, Dimethicone/vinyl Dimethicone Crosspolymer.
Yes — it contains Pinus Sylvestris Leaf Oil, Anthemis Nobilis Flower Oil.
Yes. Reading the full ingredient list, this formula is paraben-free.
It layers well with Vitamin C (L-ascorbic acid), PHAs (gluconolactone), Azelaic acid, Copper peptides, Bakuchiol, Niacinamide. Take more care combining it with Benzoyl peroxide, Retinoids (retinol, retinal), AHAs (glycolic, lactic), BHA (salicylic acid) — use them in separate routines or on alternate days.
Use it in the morning, final morning step, before makeup.
It lists 47 ingredients, of which 6 are recorded as actives.
Round Lab, a brand based in Korea.
It filters UV with Homosalate (homosalate), Octocrylene (octocrylene), Avobenzone (butyl methoxydibenzoylmethane).
Yes. Its filters cover UVB, UVA II and UVA I, so protection reaches past 340 nm into the deep-UVA range associated with ageing and pigmentation.
Unlikely. It filters with organic (chemical) filters only, which dissolve into the formula rather than sitting on the surface, so they do not leave a white cast.
It contains none of the filters named in the Hawaii and Key West reef legislation (oxybenzone and octinoxate). "Reef safe" is not a regulated term, so treat that as a fact about the filter list rather than a certification.
Yes. Let it set for a couple of minutes before foundation so it does not pill, and reapply over makeup with a stick or powder rather than rubbing more in.
Every two hours of sun exposure, and immediately after swimming, sweating heavily or towelling off.
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