Image: roundlab.com
ROUND LAB
Birch Moisturizing Sunscreen UVLock SPF 45 Broad Spectrum
A sunscreen built around Vitamin E and Niacinamide, for hydration and barrier repair.
Brand price
USD 24.99 · checked 25 Sept 2026 · on the brand's site
From the brand
What the brand says about this product. Our ingredient analysis follows below.
The brand recommends it for
- Normal skin
- Sensitive skin
How to use
Apply liberally and evenly 15 minutes before sun exposure. - Sun Protection Measures 0Spending time in the sun increases your risk of skin cancer and early aging. To decrease this risk, regularly use a sunscreen with a Broad Spectrum SPF value of 15 or higher and other sun protection measures including: limit time in the sun, especially from 10 a.m. - 2 p.m., wear long-sleeved shirts, pants, hats, and sunglasses - Children under 6 months of age: Ask a doctor - Reapply at least every 2 hours. - Use a water-resistant sunscreen if swimming or sweating
Caution
For external use only. Do not use on damaged or broken skin. When using this product keep out of eyes. Rinse with water to remove. Stop use and ask a doctor if rash occurs. Keep out of reach of children. If swallowed, get medical help or contact a Poison Control Center right away.
What's inside
Ingredients List
12 trigger at least one check · 29 trigger none
- Vitamin E
- Anti-Pollution
- Antioxidant
- May Trigger Acne
- May Worsen Irritation
- May Worsen Keratosis Pilaris
- Niacinamide
- Acne Fighting
- Barrier Repair
- Brightening
- Dark Spots
- Even Tone
- Oil Control
- Pore Refining
- Redness Reducing
- Fatty esters (glyceryl stearate, PEG-100 stearate)
- May Worsen Seborrheic Dermatitis
Key Ingredients
Chemical sunscreen3
Organic UV filters that absorb UV and release it as heat.
Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Homosalate
Fatty alcohol1
Waxy fatty alcohols used as emollients and thickeners; unrelated to drying alcohol.
Sunscreen3
Any ingredient acting as a UV filter.
Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Homosalate
Hyaluronic acid2
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Benefits
Hydrating8
Boosts hydration and relieves dry, tight skin.
Butylene Glycol, Glycerin, Glyceryl Glucoside, Hyaluronic Acid, Propanediol, Sodium Hyaluronate, Sparassis Crispa Extract, Tocopherol
Barrier Repair7
Strengthens and restores the skin's natural barrier.
Allantoin, Cetearyl Alcohol, Diethylhexyl 2,6-Naphthalate, Glycerin, Glyceryl Stearate Citrate, Niacinamide, Tocopherol
Smoothing5
Refines rough or uneven texture.
Allantoin, Cetearyl Alcohol, Diethylhexyl 2,6-Naphthalate, Glyceryl Stearate Citrate, Niacinamide
Sun Protection5
Filters UV to help prevent sun damage.
Benzotriazolyl Dodecyl P-Cresol, Butyl Methoxydibenzoylmethane, Diethylhexyl 2,6-Naphthalate, Ethylhexyl Salicylate, Homosalate
Concerns
May Worsen Seborrheic Dermatitis7
May feed the yeast involved in seborrheic dermatitis.
Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Butyloctyl Salicylate, Cetearyl Alcohol, Glyceryl Stearate Citrate, Poly C10-30 Alkyl Acrylate, Polyglyceryl-3 Distearate, Sodium Stearoyl Glutamate
May Worsen Keratosis Pilaris2
May clog follicles or strip skin prone to keratosis pilaris.
May Worsen Irritation3
May cause stinging, redness or sensitivity.
Anthemis Nobilis Flower Oil, Pinus Sylvestris Leaf Oil, Tocopherol
May Worsen Eczema2
May worsen itching or irritation for eczema-prone skin.
May Worsen Rosacea2
Can trigger flare-ups in rosacea-prone skin.
Ingredients Explained
Click on any ingredient to learn more about it
Water
Antiplaque, Skin Conditioning, Solvent
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
Learn more about Water →Acrylates Copolymer
Antistatic, Binding, Film Forming
2-propenoic acid, 2-methyl-, polymer with ethyl 2-propenoate and methyl 2-methyl-2-propenoate
Learn more about Acrylates Copolymer →Caprylyl Methicone
Skin Conditioning
Caprylyl Methicone is a silicone.
Learn more about Caprylyl Methicone →Sparassis Crispa Extract
Emulsion Stabilising, Hair Conditioning, Humectant, Skin Conditioning
Sparassis Crispa Extract is an extract of the Mushroom, Sparassis Crispa
Learn more about Sparassis Crispa Extract →Tocopherol
Antioxidant, Fragrance, Skin Conditioning, Occlusive
Tocopherol is vitamin E.
Learn more about Tocopherol →Niacinamide
Smoothing
Niacinamide is niacinamide.
Learn more about Niacinamide →Polyglyceryl-3 Distearate
Emulsifying
Polyglyceryl-3 Distearate isn't fungal acne safe.
Learn more about Polyglyceryl-3 Distearate →Butyl Methoxydibenzoylmethane
Light Stabilizer, UV Absorber, UV Filter
Butyl Methoxydibenzoylmethane is a chemical UV filter.
Learn more about Butyl Methoxydibenzoylmethane →Homosalate
Fragrance, UV Absorber, UV Filter
Homosalate is a chemical UV filter.
Learn more about Homosalate →Calcium Aluminum Borosilicate
Bulking
Calcium Aluminium Borosilicate is a glass consisting essentially of calcium and aluminium borosilicates
Learn more about Calcium Aluminum Borosilicate →
Dupes
- Medicube No Cast Just Glow Collagen Sunscreen77% match
- Medicube PDRN Hydrating UV Sun Serum73% match
- Isntree Hyaluronic Acid Daily Sun Gel73% match
- Goodal Green Tangerine Vita C Dark Spot UV Defense Sunscreen72% match
- innisfree Daily UV Invisible Barrier Sunscreen Serum Broad Spectrum SPF 47 with Green Tea70% match
- Isntree Hyaluronic Acid Fresh Sun Serum69% match