Image: roundlab.com
ROUND LAB
Birch Moisturizing Sun Stick SPF 50
A sunscreen built around Chemical sunscreen, for barrier repair and smoothing.
Brand price
USD 25.00 · 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
- Sensitive skin
- Dryness & dehydration
How to use
As the last step of a skincare routine, gently apply a sufficient amount on skin, spread it out as if creating a barrier. Before use, gently raise the content slightly(about 5mm). Due to the stick-type formulation, excessive twisting may lead to product breakage or separation.
Caution
For external use only. Do not use on damaged or broken skin. Stop use and ask a doctor if rash occurs. When using this product, keep out of eyes. Rinse with water to remove. Keep out of reach of children. If swallowed, get medical help or contact a Poison Control Center right away.
What's inside
Ingredients List
16 trigger at least one check · 31 trigger none
Key Ingredients
Chemical sunscreen4
Organic UV filters that absorb UV and release it as heat.
Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Homosalate, Octocrylene
Sunscreen4
Any ingredient acting as a UV filter.
Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Homosalate, Octocrylene
Hyaluronic acid2
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Benefits
Hydrating8
Boosts hydration and relieves dry, tight skin.
Aloe Barbadensis Leaf Extract, Butylene Glycol, Dimethicone, Dipotassium Glycyrrhizate, Glycerin, Glyceryl Glucoside, Hyaluronic Acid, Sodium Hyaluronate
Barrier Repair16
Strengthens and restores the skin's natural barrier.
Allantoin, Aloe Barbadensis Leaf Extract, Bis-Behenyl/Isostearyl/Phytosteryl Dimer Dilinoleyl Dimer Dilinoleate, Camellia Japonica Seed Oil, Copernicia Cerifera Wax, Diethylhexyl Carbonate, Diisostearyl Malate, Dimethicone, Ethylhexyl Isononanoate, Glycerin, Glyceryl Caprylate, Isopropyl Palmitate, Laminaria Japonica Extract, Phenethyl Benzoate, Silica Dimethyl Silylate, Synthetic Wax
Reduces Irritation2
Eases discomfort and supports skin resilience.
Smoothing13
Refines rough or uneven texture.
Allantoin, Aloe Barbadensis Leaf Extract, Bis-Behenyl/Isostearyl/Phytosteryl Dimer Dilinoleyl Dimer Dilinoleate, Camellia Japonica Seed Oil, Copernicia Cerifera Wax, Diethylhexyl Carbonate, Diisostearyl Malate, Dimethicone, Ethylhexyl Isononanoate, Glyceryl Caprylate, Isopropyl Palmitate, Phenethyl Benzoate, Silica Dimethyl Silylate
Sun Protection4
Filters UV to help prevent sun damage.
Butyl Methoxydibenzoylmethane, Ethylhexyl Salicylate, Homosalate, Octocrylene
Anti-Pollution6
Helps defend against airborne pollutants.
Allantoin, Ascorbic Acid, Dimethicone, Glycerin, Laminaria Japonica Extract, Viola Mandshurica Flower Extract
Concerns
May Worsen Seborrheic Dermatitis7
May feed the yeast involved in seborrheic dermatitis.
Bis-Behenyl/Isostearyl/Phytosteryl Dimer Dilinoleyl Dimer Dilinoleate, Butyloctyl Salicylate, Camellia Japonica Seed Oil, Candelilla Wax Esters, Copernicia Cerifera Wax, Diisostearyl Malate, Isopropyl Palmitate
May Worsen Keratosis Pilaris1
May clog follicles or strip skin prone to keratosis pilaris.
May Worsen Irritation2
May cause stinging, redness or sensitivity.
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 →Homosalate
Fragrance, UV Absorber, UV Filter
Homosalate is a chemical UV filter.
Learn more about Homosalate →Octocrylene
Light Stabilizer, UV Absorber, UV Filter
Octocrylene is a UV filter banned by Palau over coral-reef concerns.
Learn more about Octocrylene →Ethylhexyl Salicylate
Light Stabilizer, UV Absorber, UV Filter
Ethylhexyl Salicylate is a chemical UV filter.
Learn more about Ethylhexyl Salicylate →Butyl Methoxydibenzoylmethane
Light Stabilizer, UV Absorber, UV Filter
Butyl Methoxydibenzoylmethane is a chemical UV filter.
Learn more about Butyl Methoxydibenzoylmethane →Diethylhexyl Carbonate
Skin Conditioning, Emollient
Carbonic Acid, Bis(2- Ethylhexyl) Ester
Learn more about Diethylhexyl Carbonate →Dimethicone
Antifoaming, Skin Conditioning, Emollient, Skin Protecting
Dimethicone is a silicone.
Learn more about Dimethicone →Methyl Methacrylate Crosspolymer
Film Forming
2-Propenoic acid, 2-methyl-, 1,2-ethanediyl ester, polymer with methyl 2-methyl-2-propenoate
Learn more about Methyl Methacrylate Crosspolymer →Synthetic Wax
Abrasive, Binding, Emulsion Stabilising, Fragrance, Viscosity Controlling
Synthetic Wax is a hydrocarbon wax derived generally through Fischer-Tropsch or ethylene polymerization processes.
Learn more about Synthetic Wax →Diphenylsiloxy Phenyl Trimethicone
Antifoaming, Hair Conditioning, Skin Conditioning
Diphenylsiloxy Phenyl Trimethicone is a silicone.
Learn more about Diphenylsiloxy Phenyl Trimethicone →
Dupes
- COSRX AIRY-LIGHT OIL CONTROL CLEAR SUNSCREEN STICK SPF 5082% match
- ROUND LAB Birch Moisturizing Sunscreen UVLock SPF 45 Broad Spectrum61% match
- Anua Zero-cast Moisturizing Finish Sunscreen60% match