Round Lab Birch Juice Moisturizing UVLOCK Sun 50ml
$19.00
Sale price
$19.00
Regular price
$28.00
Skip to product information
Round Lab Birch Juice Moisturizing UVLOCK Sun 50ml
$19.00
Sale price
$19.00
Regular price
$28.00
Broad Spectrum SPF 45+ · Korea's #1 Sunscreen · Chemical Filters Only
The Moisturizer-Weight Sunscreen
Sensitive Skin Won't Fight You On.
Sensitive Skin Won't Fight You On.
A watery, hydrating chemical sunscreen built with birch tree sap, niacinamide, glycerin, hyaluronic acid, and allantoin — for customers who hate the heavy feel of most SPF. Broad-spectrum UVA + UVB protection that layers invisibly under makeup, without a mineral cast.
Broad Spectrum SPF 45+ FDA OTC Registered Zero White Cast Chemical Filters — No Zinc, No Titanium Birch Juice + Niacinamide Makeup-Ready Base
What It Is
ROUND LAB Birch Juice Moisturizing UVLock Sunscreen SPF45 Broad Spectrum is a lightweight, everyday sunscreen formulated to meet U.S. FDA OTC standards. It uses three chemical (organic) UV filters — no zinc oxide or titanium dioxide — to deliver full broad-spectrum UVA + UVB protection with zero white cast on any skin tone. Birch juice, niacinamide, glycerin, hyaluronic acid, and allantoin keep skin hydrated and comfortable through the day, and the moisturizer-like texture layers cleanly under makeup. 50ml / 1.69 fl oz. Korea's #1 sunscreen, with over 20M sold worldwide and coverage in Elle, Vogue, Allure & NBC Select.
Active Ingredients (U.S. Drug Facts)
Drug Facts — Active Ingredients
| Avobenzone 2.7% | Sunscreen — UVA Protection |
| Homosalate 13.5% | Sunscreen — UVB Protection |
| Octisalate 4.5% | Sunscreen — UVB Protection |
Use: Helps prevent sunburn. If used as directed with other sun protection measures, decreases the risk of skin cancer and early skin aging caused by the sun.
Why Chemical Sunscreen? What That Means For Your Skin
This is a chemical (organic filter) sunscreen — not a mineral one
- Zero white cast on every skin tone. Chemical filters absorb UV radiation and convert it into harmless heat. Unlike mineral sunscreens (zinc oxide, titanium dioxide), which sit on top of skin as visible reflective particles, chemical filters dissolve into the formula and dry completely clear — no chalky residue, no gray cast, no flashback in photos.
- Moisturizer-weight texture. Without mineral particles bulking up the formula, the texture stays fluid and spreads effortlessly, feeling more like a hydrating serum than sunscreen.
- Broad-spectrum coverage: UVA and UVB both blocked. Avobenzone covers UVA — the rays linked to premature aging and hyperpigmentation. Homosalate and Octisalate cover UVB — the rays that cause sunburn and DNA damage.
- Not the best fit for reactive or highly sensitive skin. Because chemical filters are absorbed into the skin to work, they can cause stinging or irritation in some sensitive, reactive, or post-procedure skin types. Mineral filters, which stay on the surface, are gentler for that group.
- Makeup-friendly from the first swipe. No white film means no interference with foundation or tinted moisturizer — it sets to a smooth base without pilling or sliding.
Have sensitive or reactive skin? We recommend the mineral version instead.
Chemical filters work by absorbing into skin, which can trigger stinging or irritation on reactive, post-procedure, or highly sensitive skin. For those customers, we recommend the Round Lab Birch Juice Mild-Up UVLOCK Sun 50ml — a 100% mineral (zinc oxide) sunscreen that sits on top of the skin and physically reflects UV rays rather than absorbing them, making it a gentler choice for reactive skin types.
The 3-Filter Broad-Spectrum System
UVA Filter
Avobenzone
2.7% (US maximum: 3%)
The most widely used UVA filter in the US market. Covers the full UVA spectrum (320–400nm) — the wavelengths responsible for photoaging, dark spots, and hyperpigmentation. Used here at near-maximum concentration.
UVB Filter
Homosalate
13.5%
A photostable UVB filter that also acts as a liquid solvent for other UV filters, helping them dissolve uniformly into the formula for a smoother, more consistent finish.
UVB Filter
Octisalate (Ethylhexyl Salicylate)
4.5%
A lightweight UVB filter that also helps improve water resistance and stabilizes other UV filters in the formula, contributing to the lightweight, non-greasy texture.
All three active ingredients are FDA-approved for use in OTC sunscreen products and have been used safely in sunscreens for decades. This product is FDA-registered as an OTC drug.
Perfect For
- All skin tones — zero white cast guaranteed
- Normal, dry, or slightly dehydrated skin
- Customers who hate heavy SPF textures
- Daily wear under makeup
- Anti-aging SPF routines
- Minimalist AM skincare routines
- Travel — compact 50ml, carry-on compliant
- Everyday moisturizer-plus-SPF combo step
Texture, Finish & Feel
Moisturizer-Weight
Watery, hydrating consistency — spreads across skin in seconds without tugging or dragging.
Smooth, Dewy Finish
No white cast, no chalky residue. Leaves a soft, hydrated glow rather than a matte or heavy finish.
Makeup-Ready Fast
Absorbs quickly and sets before foundation, without pilling, sliding, or breaking down mid-day.
Skincare Actives — Beyond the SPF
Birch Tree Sap (Betula Platyphylla Japonica Juice) Soothing
The signature ingredient of this line. Rich in minerals, enzymes, proteins, and antioxidants, it decreases inflammation, purifies, and hydrates skin.
Niacinamide Brightening
Supports an even skin tone and strengthens the skin barrier, working alongside the sunscreen's UV protection to reduce future discoloration.
Hyaluronic Acid + Glycerin Hydrating
Humectants that draw and bind water into skin, keeping it soft and comfortable even on days when sunscreen is your only hydration step.
Allantoin Calming
A gentle, well-tolerated ingredient that soothes skin and supports barrier repair, complementing the formula's overall calm, non-irritating profile.
How To Use
1
Apply as the Final AM Skincare StepAfter cleansing, toner, and serum — sunscreen goes on last, before makeup.
2
Apply 15 Minutes Before Sun ExposureChemical sunscreens need brief absorption time to activate fully. Apply at least 15 minutes before heading outdoors.
3
Use a Generous AmountApply approximately ¼ teaspoon (a nickel-sized amount) to the full face. SPF 45 is only achieved at the tested volume.
4
Spread and Pat GentlySmooth across face and neck with fingertips. Pat in gently until fully absorbed — roughly 20–30 seconds.
5
Reapply Every 2 Hours OutdoorsAll sunscreens degrade with UV exposure. Reapply at least every 2 hours during direct sun exposure.
Pro Tips
- Dry skin: This formula's moisturizer-like texture makes it a strong standalone hydrator plus SPF step.
- Sensitive or reactive skin: Chemical filters can sting on reactive or post-procedure skin — switch to the Mild-Up mineral version above if you fall in this group.
- Double cleanse at night: Chemical sunscreen actives are oil-soluble — use an oil cleanser or cleansing balm first, then follow with a water-based cleanser.
- Eye area: Keep away from eyes — chemical filters can sting on contact.
- AHA/BHA users: If you exfoliate with acids, this SPF is essential the next morning since freshly exfoliated skin is more vulnerable to UV damage.
Full Ingredient List (INCI — Inactive Ingredients)
Water, Butyloctyl Salicylate, Propanediol, Acrylates Copolymer, Butylene Glycol, Caprylyl Methicone, Polyglyceryl-3 Distearate, Benzotriazolyl Dodecyl P-Cresol, Niacinamide, Diethylhexyl 2,6-Naphthalate, Polymethylsilsesquioxane, Glycerin, Calcium Aluminum Borosilicate, 1,2-Hexanediol, Poly C10-30 Alkyl Acrylate, Pentylene Glycol, Cetearyl Alcohol, Tromethamine, Methylpropanediol, Glyceryl Stearate Citrate, Betula Platyphylla Japonica Juice, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Carbomer, Ethylhexylglycerin, Artemisia Annua Extract, Anthemis Nobilis Flower Oil, Sodium Stearoyl Glutamate, Glyceryl Polymethacrylate, Triethoxycaprylylsilane, Pinus Sylvestris Leaf Oil, Sparassis Crispa Extract, Polyether-1, Allantoin, Dipropylene Glycol, Glyceryl Glucoside, Biosaccharide Gum-1, Tocopherol, Portulaca Oleracea Extract, Sodium Hyaluronate, Hyaluronic Acid, Ascorbic Acid.
Active ingredients are listed separately in Drug Facts above.
Product Details
| Brand | ROUND LAB (South Korea) |
| Product Name | Birch Juice Moisturizing UVLock Sunscreen |
| Net Weight | 50ml / 1.69 fl oz |
| SPF / Coverage | SPF 45+ · Broad Spectrum (UVA + UVB) |
| Sunscreen Type | Chemical (Organic UV Filters) — No Zinc Oxide, No Titanium Dioxide |
| Active Ingredients | Avobenzone 2.7%, Homosalate 13.5%, Octisalate 4.5% |
| Key Skincare Actives | Birch Tree Sap, Niacinamide, Hyaluronic Acid, Glycerin, Allantoin |
| Skin Type | All Skin Types · Especially Normal, Dry, Dehydrated |
| Sensitive Skin? | Recommend Mild-Up (mineral) version instead — see callout above |
| Finish | Dewy, moisturizer-like, no white cast |
| Regulatory Status | FDA-Registered OTC Drug · Broad Spectrum labeling confirmed |
| Country of Origin | Republic of Korea |
| Usage | Morning (AM) · Final skincare step · Apply 15 min before sun exposure · Reapply every 2 hours |
100% Authentic — Buyer Protection Notice All products sold through MIMOMART are 100% authentic and sourced directly from authorized distributors. Please be cautious of products priced suspiciously low or shipped from unauthorized third-party sellers — these may be counterfeit, tampered with, or expired. The ROUND LAB Birch Juice sunscreen sold here is the U.S. FDA-registered OTC formula. Your skin deserves the real thing.