Image: roundlab.com
ROUND LAB
Birch Mild-Up Sunscreen UVLock SPF 50 Broad Spectrum
A sunscreen built around Mineral sunscreen and Hyaluronic acid, 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
- Sensitive skin
How to use
Apply liberally and evenly 15 minutes before sun exposure. - Reapply at least every 2 hours. - Use a water-resistant sunscreen if swimming or sweating - As the last step of a skincare routine, gently apply a sufficient amount on skin, spread it out as if creating a barrier.
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
11 trigger at least one check · 21 trigger none
- Fatty alcohols (Malassezia)
- May Worsen Seborrheic Dermatitis
Key Ingredients
Hyaluronic acid2
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Benefits
Hydrating9
Boosts hydration and relieves dry, tight skin.
Butylene Glycol, Cryptomeria Japonica Leaf Extract, Glycerin, Glyceryl Glucoside, Hyaluronic Acid, Propanediol, Saccharomyces Ferment Filtrate, Sodium Hyaluronate, Tocopherol
Barrier Repair7
Strengthens and restores the skin's natural barrier.
Caprylyl Glycol, Cyclohexasiloxane, Glycerin, Glyceryl Caprylate, Isododecane, Tocopherol, Zinc Oxide
Smoothing4
Refines rough or uneven texture.
Caprylyl Glycol, Cyclohexasiloxane, Glyceryl Caprylate, Isododecane
Anti-Pollution4
Helps defend against airborne pollutants.
Concerns
May Worsen Seborrheic Dermatitis3
May feed the yeast involved in seborrheic dermatitis.
Butyloctyl Salicylate, Disteardimonium Hectorite, Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone
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 →Zinc Oxide
Antimicrobial, Bulking, Colorant, Light Stabilizer, Oral Care, Skin Protecting, UV Absorber, UV Filter
Zinc Oxide is a mineral UV filter.
Learn more about Zinc Oxide →Isododecane
Perfuming, Emollient, Solvent
2,2,4,6,6-Pentamethylheptane; Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated
Learn more about Isododecane →Caprylyl Methicone
Skin Conditioning
Caprylyl Methicone is a silicone.
Learn more about Caprylyl Methicone →Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone
Hair Conditioning, Skin Conditioning
Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone is a silicone.
Learn more about Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone →Methyl Trimethicone
Hair Conditioning, Skin Conditioning, Solvent
Methyl Trimethicone is a silicone.
Learn more about Methyl Trimethicone →Disteardimonium Hectorite
Light Stabilizer, Viscosity Controlling
Disteardimonium Hectorite isn't fungal acne safe.
Learn more about Disteardimonium Hectorite →Sodium Hyaluronate
Humectant, Skin Conditioning
Sodium Hyaluronate is a hyaluronic acid.
Learn more about Sodium Hyaluronate →Hyaluronic Acid
Antistatic, Humectant, Moisturising, Skin Conditioning
Hyaluronic Acid is a hyaluronic acid.
Learn more about Hyaluronic Acid →Betula Platyphylla Japonica Juice
Skin Conditioning
Betula Platyphylla Japonica Juice is the sap from the tree, Betula platyphylla japonica, Betulaceae
Learn more about Betula Platyphylla Japonica Juice →
Dupes
- Isntree Hyaluronic Acid Natural Sun Cream77% match
- Axis-Y Complete No-Stress Physical Sunscreen V.376% match
- ROUND LAB Birch Moisturizing Sun Cushion SPF 5075% match
- Goodal Heartleaf Soothing Mineral Filter Sun Cream72% match
- innisfree Daily UV Defense Mineral Sunscreen Broad Spectrum SPF 45 with Color Correcting71% match
- d'Alba White Truffle Waterfull Mild Sunscreen SPF 50+68% match