Home / Sunscreens / Round Lab Birch Juice Moisturizing Mild-Up (UVLock) Sunscreen SPF50+ PA++++ (mineral)
Round Lab Birch Juice Moisturizing Mild-Up (UVLock) Sunscreen SPF50+ PA++++ (mineral)
By Nur → Last verified 10/5/2026
Price checked 10/5/2026
Verified 2026-10-05 on YesStyle: $19.60 (list $28.00; 30% OFF (FLASH SALE)). Prices change often, so confirm on the retailer's page.
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What we found
Based on how this product compares to others in the sunscreens category, cross-referenced against retailer listings and market data.
Strengths
- + Mineral sunscreen with zinc oxide (SPF50+ PA++++)
- + Also contains birch sap, sodium hyaluronate and glyceryl glucoside
Worth knowing
- - Not fragrance-free: the ingredient list includes essential oils (Anthemis Nobilis Flower Oil, Pinus Sylvestris Leaf Oil)
- - This is the US Drug Facts formula; reviewers often mention white cast with this zinc oxide formula
Key ingredients
These are the ingredients Round Lab highlights for this product, cross-checked against general dermatological and cosmetic-chemistry sources, not a full INCI list.
Fragrance: The ingredient list includes essential oils, so it is not fragrance-free.
| Ingredient | What it is | What it does for skin |
|---|---|---|
| Zinc oxide | A mineral (physical) UV filter, one of two ingredients classified as mineral sunscreen actives. | Provides broad-spectrum UVA/UVB protection and has skin-soothing properties, often used in sunscreens for sensitive skin. |
| Birch sap | Sap tapped from birch trees, used in Korean skincare as a lightweight hydrating base. | Commonly included for its hydrating, soothing properties, though it has less independent clinical research than more established actives. |
| Sodium hyaluronate | The salt form of hyaluronic acid, commonly used for its water solubility and stability in formulas; molecular weight varies by product rather than being uniformly smaller. | Draws and holds moisture the same way hyaluronic acid does; how easily it absorbs depends on the specific molecular weight used, which formulas don't always disclose. |
| Glyceryl glucoside | A moisturizing ingredient made by combining glycerin with glucose. | Acts as a humectant, helping skin attract and hold water. |
What the brand says
Round Lab's own marketing claims, not our own findings.
- Moisturizing sunscreen with SPF50+ broad-spectrum protection
- Reflects ultraviolet rays rather than being absorbed by skin
- 17% zinc oxide as the active sunscreen ingredient
- Refreshing finish
Research-Based
Our assessment comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. This product hasn't been hands-on tested yet. See our Methodology for what that distinction means.
Price history
Current price is the lowest we've recorded so far.
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Frequently asked
How much does Round Lab Birch Juice Moisturizing Mild-Up (UVLock) Sunscreen SPF50+ PA++++ (mineral) cost per mL?
$0.39 per mL (currently $19.60 for 50 mL).
Has Round Lab Birch Juice Moisturizing Mild-Up (UVLock) Sunscreen SPF50+ PA++++ (mineral) been hands-on tested?
Not yet. Our assessment for this product comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. See our Methodology for what that distinction means.
What are the key ingredients in Round Lab Birch Juice Moisturizing Mild-Up (UVLock) Sunscreen SPF50+ PA++++ (mineral)?
The ingredients Round Lab highlights for this product include Zinc oxide, Birch sap, Sodium hyaluronate, Glyceryl glucoside.
Sources
Pricing and availability for this product were verified against the following retailer listings.