Round Lab
Birch Juice Moisturizing UVLOCK SPF 45+ PA++++
face sunscreen
Round Lab
face sunscreen
Added Last edited
Fit by skin type
General, ingredient-based — not your personalized match.
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Take the skin testConcentrations
| BUTYL METHOXYDIBENZOYLMETHANE | 2.7% |
| ETHYLHEXYL SALICYLATE | 4.5% |
| HOMOSALATE | 13.5% |
Experience the perfect blend of hydration and sun protection with ROUND LAB's Birch Moisturizing UV Sunscreen. Infused with birch sap and hyaluronic acid, this lightweight formula delivers deep moisture while shielding your skin from harmful UVA and UVB rays with SPF 45 Broad Spectrum. The sunscreen's gentle, non-greasy texture absorbs quickly without leaving a white cast, making it ideal for daily use under makeup or on its own. Enriched with niacinamide and allantoin, it not only protects but also soothes and brightens the skin, promoting a healthy, radiant complexion.
Birch Juice Moisturizing UVLOCK SPF 45+ PA++++ is a lightweight sunscreen from Round Lab, a brand based in Korea. It is rated SPF 45+ 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 44 ingredients, each broken down in full below.
By its ingredient list the formula reads as light: water and humectants lead, with emollients kept lower in the order. Silicones in the formula tend to give a smooth, blurred finish and help it grip under makeup. Hydration is handled by Propanediol, Butylene Glycol and Glycerin, humectants that pull water into the upper layers of skin rather than sealing it there.
It is a chemical (organic-filter) sunscreen, using Avobenzone, Octisalate and Homosalate. 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. One of the filters is photounstable and no recognised stabiliser sits beside it, so protection may drop measurably within the first hour of direct sun. Reapply more often than the label suggests.
Hydration: High. Ingredients that pull and hold water in the upper layers of skin, and here that comes from Propanediol, Butylene Glycol, Glycerin and Methylpropanediol.
Soothing: Moderate. Ingredients aimed at visible redness and reactivity, and here that comes from Allantoin, Niacinamide, Artemisia Annua Extract and Glyceryl Glucoside.
On richness alone it suits Balanced, Combination (oily) and Oily skin best, and is the least natural fit for Dry and Combination (dry) 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, cell renewal and firmness signalling. 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 oil-free. 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
Brightens and balances complexion for a more uniform appearance
Fades hyperpigmentation and evens out dark spots over time
Tightens and refines the look of enlarged pores
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
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.
A weak filter used mainly as a solvent — it dissolves the crystalline filters (avobenzone, oxybenzone) so they can be formulated at all.
Another solvent-filter: modest UVB coverage, mostly there to carry other filters.
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 5%, so it is present at roughly 2.5–5%.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
2nd on the list. Regulation caps it at 5%, so it is present at roughly 2.5–5%.
2-Ethylhexyl salicylate
3rd 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
4th on the list, which puts it at an estimated 2–10% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
5th on the list, which puts it at an estimated 2–10% of the formula.
Benzoic acid, 2-hydroxy-, 2-butyloctyl ester
6th on the list, which puts it at an estimated 2–10% of the formula.
1,3-dihydroxypropane
7th on the list, which puts it at an estimated 1–5% of the formula.
2-propenoic acid, 2-methyl-, polymer with ethyl 2-propenoate and methyl 2-methyl-2-propenoate
8th on the list, which puts it at an estimated 1–5% 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)
9th on the list, which puts it at an estimated 1–5% of the formula.
1,1,1,3,5,5,5-Heptamethyl-3-octyl-trisiloxane
12th on the list, which puts it at an estimated 1–3% of the formula.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
15th 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
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Dihydroxypentane
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 stands without 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.
Anthemis Nobilis Flower Oil, Pinus Sylvestris Leaf Oil
Caprylyl Methicone, Polymethylsilsesquioxane
Polymethylsilsesquioxane, Poly C10-30 Alkyl Acrylate
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 44 ingredients on the label.
Sets the thickness, spread and stability of the formula
Dissolves and carries everything else
Draws water into the upper layers of skin
Absorbs or scatters ultraviolet light
Changes how skin behaves rather than how it feels
Forms a film that slows water loss
Botanical material, usually for antioxidants or scent
Lifts oil and dirt, or holds oil and water together
Softens and smooths by filling gaps between skin cells
Neutralises free radicals from UV and pollution
Sets the acidity the formula needs to work
Calms visible redness and irritation
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 5%, so it is present at roughly 2.5–5%.
1-[4-(1,1-Dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
2nd on the list. Regulation caps it at 5%, so it is present at roughly 2.5–5%.
2-Ethylhexyl salicylate
3rd 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
4th on the list, which puts it at an estimated 2–10% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
5th on the list, which puts it at an estimated 2–10% of the formula.
Benzoic acid, 2-hydroxy-, 2-butyloctyl ester
6th on the list, which puts it at an estimated 2–10% of the formula.
1,3-dihydroxypropane
7th on the list, which puts it at an estimated 1–5% of the formula.
2-propenoic acid, 2-methyl-, polymer with ethyl 2-propenoate and methyl 2-methyl-2-propenoate
8th on the list, which puts it at an estimated 1–5% 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)
9th on the list, which puts it at an estimated 1–5% of the formula.
1,1,1,3,5,5,5-Heptamethyl-3-octyl-trisiloxane
10th on the list, which puts it at an estimated 1–5% of the formula.
1,2,3-Propanetriol, homopolymer, octadecanoates (1:2) (2 mol glycerol average molar ratio)
11th on the list, which puts it at an estimated 1–3% of the formula.
Dioctyl 2,6-Naphthalate
12th on the list, which puts it at an estimated 1–3% of the formula.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
13th on the list, which puts it at an estimated 1–3% of the formula.
Phenol, 2-(2H-Benzotriazol-2-yl)-6-Dodecyl-4-Methyl-, Branched and Linear
14th on the list, which puts it at an estimated 1–3% of the formula.
Polymer formed by hydrolysis and condensation of methyltrimethoxysilane
15th 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
16th on the list, which puts it at an estimated 1–3% of the formula.
Calcium Aluminium Borosilicate is a glass consisting essentially of calcium and aluminium borosilicates
17th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
18th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Polymer of acrylic acid ester and C10-30 alcohol
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Dihydroxypentane
20th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Alcohols, C16-18
21st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,3-Propanediol, 2-amino-2-(hydroxymethyl)-
22nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Methyl-1,3-propanediol
23rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2,3-Propanetricarboxylic acid, 2-hydroxy-, ester with 1,2,3-propanetriol monooctadecanoate
24th 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
25th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
C10-30 alkyl propenoate, polymer with propenoic acid, butenoic acidand/or alkyl propenoates, product with propenyl sucrose ether or propenyl 2,2-dihydroxymethyl-1,3-propanediol
26th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Propenoic acid, polymer with 2,2-bis(hydroxymethyl)propane-1,3-diol 2-propenyl ether
27th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Propanediol, 3-(2-ethylhexyloxy)
28th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Artemisia Annua Extract is an extract of the whole herb, Artemisia annua L., Compositae
29th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
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
30th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium hydrogen N-(1-oxooctadecyl)-L-glutamate
31st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Propenoic acid, 2-methyl-, homopolymer, ester with 1,2,3-propanetriol
32nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Silane, triethoxyoctyl-
33rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sparassis Crispa Extract is an extract of the Mushroom, Sparassis Crispa
34th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Pinus Sylvestris Leaf Oil is the volatile oil obtained from the needles of the Scotch Pine, Pinus sylvestris L., Pinaceae
35th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Copolymer of PEG-180, dodoxynol-5, PEG-25 tristyrylphenol and tetramethoxymethylglycouril monomers
36th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,1'-Oxydipropan-2-ol; Oxydipropan-2-ol; Hydroxypropyloxypropanol
37th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Urea, (2,5-dioxo-4-imidazolidinyl)-
38th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
alpha-D-Glucopyranoside, 2-Hydroxy-1-(Hydroxymethyl)ethyl
39th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Biosaccharide Gum-1 is a fermentation gum derived from sorbitol. It is described as a polymer of α-L-fucose-1|->|3-α- D-galactose-1|->|3-α-D-galacturonic acid trisaccharides
40th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
3,4-Dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-benzopyran-6-ol; .alpha.-tocopherol; Vitamin E
41st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Portulaca Oleracea Extract is an extract of the whole plant of the Purselane, Portulaca oleracea L., Portulacaceae
42nd 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
43rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Hyaluronic acid
44th 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.
Isntree
Shares 13 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Water, Homosalate, Butyloctyl Salicylate, Ethylhexyl Salicylate, Butylene Glycol
Torriden
Shares 11 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Water, Butyloctyl Salicylate, Propanediol, Niacinamide, Acrylates Copolymer
Abib
Shares 11 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Butyl Methoxydibenzoylmethane, Homosalate, Ethylhexyl Salicylate, Water, Butylene Glycol
Isntree
Shares 10 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Water, Butylene Glycol, Ethylhexyl Salicylate, Homosalate, Niacinamide
Missha
Shares 10 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Water, Butyloctyl Salicylate, Butylene Glycol, Niacinamide, Pentylene Glycol
SOME BY MI
Shares 10 key ingredients with Birch Juice Moisturizing UVLOCK SPF 45+ PA++++: Water, Homosalate, Butyloctyl Salicylate, Niacinamide, Butylene Glycol
BUTYL METHOXYDIBENZOYLMETHANE, ETHYLHEXYL SALICYLATE, HOMOSALATE, WATER, BUTYLOCTYL SALICYLATE, PROPANEDIOL, ACRYLATES COPOLYMER, BUTYLENE GLYCOL, CAPRYLYL METHICONE, POLYGLYCERYL-3 DISTEARATE, DIETHYLHEXYL 2,6-NAPHTHALATE, NIACINAMIDE, BENZOTRIAZOLYL DODECYL P-CRESOL, POLYMETHYLSILSESQUIOXANE, GLYCERIN, CALCIUM ALUMINUM BOROSILICATE, 1,2-HEXANEDIOL, POLY C10-30 ALKYL ACRYLATE, PENTYLENE GLYCOL, CETEARYL ALCOHOL, TROMETHAMINE, METHYLPROPANEDIOL, GLYCERYL STEARATE CITRATE, BETULA PLATYPHYLLA JAPONICA JUICE, ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER, CARBOMER, ETHYLHEXYLGLYCERIN, ARTEMISIA ANNUA EXTRACT, ANTHEMIS NOBILIS FLOWER OIL, SODIUM STEAROYL GLUTAMATE, GLYCERYL POLYMETHACRYLATE, TRIETHOXYCAPRYLYLSILANE, SPARASSIS CRISPA EXTRACT, PINUS SYLVESTRIS LEAF OIL, POLYETHER-1, DIPROPYLENE GLYCOL, ALLANTOIN, GLYCERYL GLUCOSIDE, BIOSACCHARIDE GUM-1, TOCOPHEROL, PORTULACA OLERACEA EXTRACT, SODIUM HYALURONATE, HYALURONIC ACID, ASCORBIC ACID.
NIACINAMIDE, SODIUM HYALURONATE, HYALURONIC ACID, ASCORBIC ACID.
Apply evenly on areas prone to UV exposure.
Judged on how rich the formula reads from its ingredient list, it suits Balanced, Combination (oily), Oily skin best. It is the least natural fit for Dry, Combination (dry) 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.
4 ingredients could feed malassezia: Polyglyceryl-3 Distearate, Glyceryl Stearate Citrate, Anthemis Nobilis Flower Oil, Pinus Sylvestris Leaf Oil. 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 Caprylyl Methicone, Polymethylsilsesquioxane.
Yes — it contains Anthemis Nobilis Flower Oil, Pinus Sylvestris Leaf 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 44 ingredients, of which 7 are recorded as actives.
Round Lab, a brand based in Korea.
It filters UV with Avobenzone (butyl methoxydibenzoylmethane), Octisalate (ethylhexyl salicylate), Homosalate (homosalate).
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.
More often than the usual advice. It carries a photounstable filter with no stabiliser beside it, so protection can drop within the first hour of direct sun — reapply at least every two hours, and sooner in strong sun.
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