Niacinamide
Why it stands out in this product: Niacinamide is listed on the linked official full ingredient page.
What it does: A form of vitamin B3 listed in serums, toners, and moisturizers.
ROUND LAB
Birch Moisturizing Sunscreen UVLOCK SPF45+ PA++++
A lightweight cream sunscreen in a 50 mL tube. The linked official US page lists SPF45+ PA++++, while the pictured tube reads SPF45 Broad Spectrum. Check the rating and directions on the exact package you buy.
50 mLBrand information
BUYING SNAPSHOT
Where to buy · ROUND LAB · Ulta Beauty
Price snapshot · Ulta Beauty · US$24.99 checked 2026-10-13
Check current purchase options ↓Product information at a glance
| Product type | Sunscreens |
|---|---|
| Size | 50 mL |
| Selected ingredients | NIACINAMIDE · GLYCERIN · SODIUM HYALURONATE · HYALURONIC ACID |
| Product information | Round Lab English storefront (online listing) |
Consider it for: You want to compare a cream-texture daily sunscreen.
Based on brand information and published sources, not a hands-on review.
01 / TEXTURE
Product texture and finish
Brand description
ROUND LAB describes a lightweight cream texture.
02 / INGREDIENTS
Highlighted ingredients and formula notes
SPF45+ PA++++Birch juiceHyaluronic acid
These are selected ingredients to look at first when getting to know this product. They are not the complete ingredient list, and an ingredient name alone cannot predict how a finished formula will work for you.
| Ingredient | Common role or formula detail |
|---|---|
| NIACINAMIDE | Vitamin B3, used as a skin-conditioning ingredient. |
| GLYCERIN | A humectant that attracts water to the outer skin layers. |
| SODIUM HYALURONATE | A hyaluronic-acid salt used as a humectant. |
| HYALURONIC ACID | A humectant that binds water. |
Hyaluronic acid
Why it stands out in this product: The official list includes hyaluronic acid and sodium hyaluronate.
What it does: A water-binding ingredient used in moisturizers; sodium hyaluronate is a related salt form.
Glycerin
Why it stands out in this product: Glycerin appears in the linked official full ingredient list.
What it does: A humectant that helps hold water in the outer skin layer.
What these ingredients do
Read the ingredient guide ↗Ingredient research provides context. The studies below did not test this product.
Hyaluronic Acid / Sodium Hyaluronate
Hyaluronic acid
A water-binding ingredient used in moisturizers; sodium hyaluronate is a related salt form.
More about Hyaluronic acid ↗Research and source notes for these ingredients
Research notes for these ingredients
Hyaluronic acid
A four-week trial on the legs of 36 older adults found higher hydration with a low-molecular-weight HA lotion than a high-molecular-weight lotion or the base. Water loss and symptom scores did not differ significantly.
Muhammad et al., 2024 · randomized trial ↗A leg study in older adults cannot establish facial results for products with different formulas or use sites. Molecular weight, concentration and the whole formula matter.
03 / YOUR ROUTINE
Official directions and routine order
Official directions
Apply liberally and evenly 15 minutes before sun exposure. Reapply at least every 2 hours. Use a water-resistant sunscreen if swimming or sweating. The US label also says to keep the product out of the eyes and rinse with water if contact occurs.
Official directions checked 2026-10-23 ↗Check the exact package and official directions before use.
Why the online ingredient list needs a package check
The linked storefront joins two apparent ingredient names without a separator and presents inconsistent active-ingredient information. We have not corrected the text by guessing or used it as a verified complete formula. Check the exact package ingredient list and Drug Facts.
Official product reference ↗04 / THE NEXT STEP
Where to buy and which product details to check
Check the size, full ingredient list, price, stock and delivery to your address on the seller’s page.
SIDE BY SIDE
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A serum-like sunscreen with SPF50 broad-spectrum protection.
Explore the product
SunscreensSources & product information
Sources checked: 2026-10-10 · Product-page details checked 2026-10-23
Product details follow the linked global / US sources. Check the label sold in your country for ingredients and directions.
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ROUND LAB · Birch Moisturizing Sunscreen UVLOCK SPF45+ PA++++ · 50 mL
US / global product information
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Products with overlapping ingredient lists
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Overlapping-list comparisons need a complete, readable ingredient list for this product version.