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ROUND LAB Birch Juice Moisturizing UVLOCK SPF 45
ROUND LAB

Birch Juice Moisturizing UVLOCK SPF 45

SPF 45 Invisible No white cast — chemical/hybrid filters that straight-up disappear on skin. United States us-fda Formulation variant: us-fda. Region-specific reformulations are tracked as separate products.

Hybrid with avobenzone/homosalate/octisalate plus niacinamide; smooth chemical filter texture, modest EDC concern from homosalate.

◐ CHEM Chemical filters Chemical filters — Organic filters absorb UV. Cosmetically elegant, but filter choice matters. ((· BS Broad spectrum Broad spectrum — Blocks UVA + UVB — covers the whole sun-damage spectrum. F F-FREE Fragrance-free Fragrance-free — No added fragrance — lower irritation risk if your skin's reactive. A A-FREE Alcohol-free Alcohol-free — No drying short-chain alcohols (denatured / SD alcohol).
Where to buy it
Ulta US In stock
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68.3
Composite
Composite score · independent
Ranks #951 of 1558 in the current catalogue. Hybrid with avobenzone/homosalate/octisalate plus niacinamide; smooth chemical filter texture, modest EDC concern from homosalate.
Composite is a weighted blend: UV 25% · Modernity 10% · Sensitivity 15% · Environment 10% · Elegance 15% · Health 25%. That's the recipe.
01 The score breakdown
UV protection How hard it blocks UVA + UVB across the spectrum at the stated SPF/PA. 77
Filter modernity Dings legacy filters (octinoxate, oxybenzone); rewards photostable next-gen ones. 50
Sensitivity safety Risk for reactive skin — fragrance, alcohol, and known sensitisers. 62
Reef / env. safety Reef toxicity plus how biodegradable the UV filters and surfactants are. 85
Cosmetic elegance Spread, finish, white-cast, and how it actually feels on skin. 72
Health safety Endocrine concerns and systemic absorption signals across the whole formula. 62
02 Composition · key UV filters 3 filters resolved
UVA-I 340–400nm UVA-I (340–400nm) — covered UVA-II 320–340nm UVA-II (320–340nm) — covered UVB 290–320nm UVB (290–320nm) — covered
Avobenzone Legacy Older organic filter. Photostable in combination; some literature concerns.
Homosalate Legacy Older organic filter. Photostable in combination; some literature concerns.
Octisalate Legacy Older organic filter. Photostable in combination; some literature concerns.
03 The facts, at a glance
Protection
Filter type Mineral filters (zinc oxide, titanium dioxide) sit on skin and reflect UV. Chemical filters absorb UV. Hybrid runs both.
Chemical
Broad spectrum Covers both UVA and UVB. UVA drives aging and deeper damage; UVB gives you burns.
Yes
Formulation & feel
Texture How it feels going on — milk, gel, cream, spray, stick, essence, lotion, powder, or cushion.
Cream
Finish How it looks once dry: matte, natural, dewy, or glowy.
Natural
Tinted Adds sheer pigment (iron oxides) that masks the white cast common to mineral filters and gives a skin-tone finish.
No
Fragrance-free No synthetic perfume added. Not FDA-defined in the US; the EU requires 'Parfum' + the 26 named allergens on the label. 'Unscented' is different — it can hide masking fragrance. Botanical oils still scent.
Yes
Alcohol-free No drying short-chain alcohols (alcohol denat., SD alcohol, ethanol). Doesn't mean fatty alcohols like cetyl or stearyl — those are emollients.
Yes
Verdict Is it worth it?

US-formula SPF 45 using avobenzone with homosalate and octisalate, stabilized by diethylhexyl 2,6-naphthalate. Niacinamide and birch juice keep the base familiar, but the FDA-allowed filter set is dated relative to the global Round Lab versions and carries homosalate-related concerns.

Pros
  • Niacinamide and birch juice in a lightweight, alcohol-free cream
  • Photostabilized avobenzone via diethylhexyl 2,6-naphthalate
  • Fragrance-free and alcohol-free per INCI
  • Calming birch juice, allantoin, and glycyrrhizate
Cons
  • Older US filter list with no modern UVA options like DHHB or BEMT
  • Homosalate is flagged for endocrine-disrupting potential
  • No PA rating to gauge UVA protection directly
  • Trace pine and chamomile oils may flag for reactive skin

Who it's for: US buyers who specifically need an FDA-compliant chemical SPF from Round Lab; global versions offer stronger filter chemistry where available.

04 Full ingredient list (INCI) 46 ingredients
MODERN FILTER 0 LEGACY FILTER 3 MINERAL FILTER 0 ADDED FRAGRANCE 0 NATURAL FRAGRANCE 0 ALCOHOL 0 WATCH 0 ACTIVE 7
Water·Butylocty (pending review)·Salicylate (pending review)·Propanediol·Acrylates Copolymer·Butylene Glycol·Caprylyl Methicone·Polyglyceryl-3 Distearate·Benzotriazolyl Dodecyl P-cresol· Niacinamide Vitamin B3 — barrier + brightening. ·Diethylhexyl 2 (pending review)·6-Naphthalate (pending review)·Polymethylsilsesquioxane· Glycerin Humectant — the workhorse hydrator. ·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 Humectant — the workhorse hydrator. ·Artemisia Annua Extract·Anthemis Nobilis Flower Oil·Sodium Stearoyl Glutamate·Glyceryl Polymethacrylate·Triethoxycaprylylsilane·Pinus Sylvestris Leaf Oil·Sparassis Crispa Extract·Polyether-1· Allantoin Soothing; barrier-supportive. ·Dipropylene Glycol·Glyceryl Glucoside·Biosaccharide Gum-1· Tocopherol Vitamin E — antioxidant. ·Portulaca Oleracea Extract· Sodium Hyaluronate Hyaluronic acid — humectant. · Hyaluronic Acid Hyaluronic acid — humectant. ·Ascorbic Acid· Butyl Methoxydibenzoylmethane Avobenzone — UVA filter, needs stabilisation. · Homosalate Homosalate — legacy UVB filter; endocrine literature. · Ethylhexyl Salicylate Octisalate — older filter; well-tolerated.
Source: brand-published INCI. Last verified 2026. Show in detail
01 Water Water
02 Butylocty Pending review
03 Salicylate Pending review
04 Propanediol Propanediol
05 Acrylates Copolymer Acrylates Copolymer
06 Butylene Glycol Butylene Glycol
07 Caprylyl Methicone Caprylyl Methicone
08 Polyglyceryl-3 Distearate Polyglyceryl-3 Distearate
09 Benzotriazolyl Dodecyl P-cresol Benzotriazolyl Dodecyl p-Cresol
10 Niacinamide ACTIVE Vitamin B3 — barrier + brightening.
11 Diethylhexyl 2 Pending review
12 6-Naphthalate Pending review
13 Polymethylsilsesquioxane Polymethylsilsesquioxane
14 Glycerin ACTIVE Humectant — the workhorse hydrator.
15 Calcium Aluminum Borosilicate Calcium Aluminum Borosilicate
16 1‚2-Hexanediol 1,2-Hexanediol
17 Poly C10-30 Alkyl Acrylate Poly C10-30 Alkyl Acrylate
18 Pentylene Glycol Pentylene Glycol
19 Cetearyl Alcohol Cetearyl Alcohol
20 Tromethamine Tromethamine
21 Methylpropanediol Methylpropanediol
22 Glyceryl Stearate Citrate Glyceryl Stearate Citrate
23 Betula Platyphylla Japonica Juice Japanese White Birch Juice
24 Acrylates/C10-30 Alkyl Acrylate Crosspolymer Acrylates/C10-30 Alkyl Acrylate Crosspolymer
25 Carbomer Carbomer
26 Ethylhexylglycerin ACTIVE Humectant — the workhorse hydrator.
27 Artemisia Annua Extract Sweet Wormwood Extract
28 Anthemis Nobilis Flower Oil Roman Chamomile Oil
29 Sodium Stearoyl Glutamate Sodium Stearoyl Glutamate
30 Glyceryl Polymethacrylate Glyceryl Polymethacrylate
31 Triethoxycaprylylsilane Triethoxycaprylylsilane
32 Pinus Sylvestris Leaf Oil Scotch Pine Leaf Oil
33 Sparassis Crispa Extract
34 Polyether-1
35 Allantoin ACTIVE Soothing; barrier-supportive.
36 Dipropylene Glycol Dipropylene Glycol
37 Glyceryl Glucoside Glyceryl Glucoside
38 Biosaccharide Gum-1 Biosaccharide Gum-1
39 Tocopherol ACTIVE Vitamin E — antioxidant.
40 Portulaca Oleracea Extract
41 Sodium Hyaluronate ACTIVE Hyaluronic acid — humectant.
42 Hyaluronic Acid ACTIVE Hyaluronic acid — humectant.
43 Ascorbic Acid Ascorbic Acid (Vitamin C)
44 Butyl Methoxydibenzoylmethane LEGACY FILTER Avobenzone — UVA filter, needs stabilisation.
45 Homosalate LEGACY FILTER Homosalate — legacy UVB filter; endocrine literature.
46 Ethylhexyl Salicylate LEGACY FILTER Octisalate — older filter; well-tolerated.