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Shop ROUND LAB Birch Juice Moisturizing Sun Stick SPF50+ Broad Spectrum 0.67oz
SPF
SPF
ROUND LAB

Birch Juice Moisturizing Sun Stick SPF50+ Broad Spectrum 0.67oz

~$20· 0.67ozSPF 50
Dark spotsRednessDrynessFine lines & firmness

What it's good for

Key actives from our research database. Click any to read the full evidence dossier.

  • NiacinamideStrong evidenceFull dossier ↗

    A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.

    Good for: Brightening, Barrier repair, Anti-inflammatory

  • Vitamin CStrong evidenceFull dossier ↗

    Brightens dull skin and helps fade dark spots. Also defends against everyday UV and pollution damage when worn under sunscreen.

    Good for: Brightening, Antioxidant

  • Hyaluronic AcidStrong evidenceFull dossier ↗

    A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.

    Good for: Hydrating

  • Matrixyl PeptidesModerate evidenceFull dossier ↗

    Signals your skin to make more collagen. Quiet but real support for firmness and fine lines with consistent daily use.

    Good for: Anti-aging

  • AdenosineModerate evidenceFull dossier ↗

    A Korean-approved anti-wrinkle ingredient that encourages collagen production for a smoother, firmer look.

    Good for: Anti-aging

  • AllantoinAnecdotal evidenceFull dossier ↗

    A gentle smoother and skin-soother. Reduces flakiness and helps the surface look more even.

    Good for: Anti-inflammatory, Hydrating

  • DHHBModerate evidenceFull dossier ↗

    A modern UVA filter common in Korean and European sunscreens. It fills the long-wave UVA gap that UVB-focused filters cannot cover and is valued for remaining stable during sun exposure.

    Good for: Sun protection

  • Ethylhexyl TriazoneModerate evidenceFull dossier ↗

    A high-efficiency UVB filter behind many elegant high-SPF Korean and European formulas. It contributes strong burn protection without requiring the heavier filter load of less efficient UVB absorbers.

    Good for: Sun protection

  • Polysilicone-15Moderate evidenceFull dossier ↗

    A polymeric UVB filter used to build lightweight, silky sunscreen textures. It supports SPF while its silicone backbone helps the formula spread into an even protective film.

    Good for: Sun protection

New to this? Patch test on your inner arm for 24 to 48 hours before applying to your face. If you have sensitive skin or rosacea, start 2 to 3 times per week and build up slowly.

Evidence behind the ingredients

Real citations from our research database, one per tracked active in this product. Click any ingredient name to read its full evidence dossier.

NiacinamideStrong evidence10 citations

A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.

Moro F et al., Skin Cancer Prevention and Antiaging: Role of Nicotinamide, International Journal of Molecular Sciences 2026

2026Mechanism onlyPMID:42278444View source ↗

Passeron T et al., An Investigator-Blinded, Randomized Trial of a Broad-Spectrum Sunscreen Containing Sclareolide and Niacinamide, Dermatology and Therapy (Heidelberg) 2026

2026Positive (efficacy)PMID:41240206View source ↗

Vergilio MM et al., Topical Formulation with Niacinamide Combined with 5 MHz Ultrasound for Improving Skin Ageing, Current Medicinal Chemistry 2025

2025Positive (efficacy)PMID:39171587View source ↗
Vitamin CStrong evidence15 citations

Brightens dull skin and helps fade dark spots. Also defends against everyday UV and pollution damage when worn under sunscreen.

Krutmann J et al. PINGing Sunshine: A Review of the Evidence for Adding Non-Filtering Photoprotective Ingredients to Sunscreens. Photodermatol Photoimmunol Photomed. 2025;41(6). — Review of Photoprotective INGredients (PINGs); L-ascorbic acid (vitamin C) identified as a top-ranked PING demonstrating efficacy across multiple photodamage endpoints.

2025Meta-analysis (positive)PMID:41152208View source ↗

Pullar JM et al., The roles of vitamin C in skin health, Nutrients 2017;9(8):866 — concluded topical efficacy "poorly understood"; supports dietary vitamin C

2017Mechanism onlyPMID:28805671View source ↗

Lee JH et al., Effects of VitabridC12 on Skin Inflammation, Annals of Dermatology 2017

2017Mechanism onlyPMID:28966510View source ↗
Hyaluronic AcidStrong evidence7 citations

A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.

Karabat MU, Tuncer MC. Effects of hyaluronic acid on skin at the cellular level: a systematic review. Rev Assoc Med Bras. 2025;71(8):e20250208. — Systematic review of 45 studies found low-molecular-weight HA stimulates keratinocyte proliferation and migration while high-molecular-weight HA drives skin hydration, supporting topical HA as an effective skin-hydrating and barrier-supporting ingredient.

2025Meta-analysis (positive)PMID:40990743View source ↗

Bravo B et al., Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence, Dermatology and Therapy 2022;12(12):2657-2680 — HA-based cosmeceuticals reliably improve hydration and signs of skin aging

2022Meta-analysis (positive)PMID:36200921View source ↗

Lee SG et al., Hyaluronan Oligosaccharides Improve Rosacea-Like Phenotype through Anti-Inflammatory and Epidermal Barrier-Improving Effects, Annals of Dermatology 2020

2020Mechanism onlyPMID:33911737View source ↗
+6 more ingredients
Matrixyl PeptidesModerate evidence6 citations

Signals your skin to make more collagen. Quiet but real support for firmness and fine lines with consistent daily use.

Yang Y et al., Comprehensive evaluation of the efficacy and safety of a new multi-component anti-aging topical eye cream, Skin Research and Technology 2024;30(7):e13790 — 12-week study of active complex containing Matrixyl 3000 peptides showed significant improvement in hydration, elasticity, periorbital wrinkles

2024Positive (efficacy)PMID:38932444View source ↗

Aruan RR et al., Double-blind, Randomized Trial on the Effectiveness of Acetylhexapeptide-3 Cream and Palmitoyl Pentapeptide-4 Cream for Crow's Feet, Journal of Clinical and Aesthetic Dermatology 2023;16(2):37-43 — RCT of topical palmitoyl pentapeptide-4 (Matrixyl) for periorbital wrinkles

2023Positive (efficacy)PMID:36909866View source ↗

Imhof L, Leuthard D, Topical Over-the-Counter Antiaging Agents: An Update and Systematic Review, Dermatology 2021;237(2):217-229 — SR covering topical antiaging peptides

2021Meta-analysis (positive)PMID:32882685View source ↗
AdenosineModerate evidence6 citations

A Korean-approved anti-wrinkle ingredient that encourages collagen production for a smoother, firmer look.

Yang HJ et al., Two-phase delivery using a horse oil and adenosine-loaded dissolving microneedle patch for skin barrier restoration, moisturization, and wrinkle improvement, Journal of Cosmetic Dermatology 2019;18(3):936-943 — Korean clinical study (n=20): adenosine microneedle patches improved elasticity, hydration, dermal density, wrinkles

2019Positive (efficacy)PMID:30160014View source ↗

Kang G et al., Adenosine-loaded dissolving microneedle patches to improve skin wrinkles, dermal density, elasticity and hydration, International Journal of Cosmetic Science 2018;40(2):199-206 — Korean-authored; adenosine microneedle patches matched or exceeded adenosine cream for multiple endpoints

2018Positive (efficacy)PMID:29574973View source ↗

Kim MY et al., Effect of adenosine on melanogenesis in B16 cells and zebrafish, Annals of Dermatology 2014;26(2):209-13 — adenosine suppresses pigmentation via negative regulation of tyrosinase in cellular and zebrafish models

2014Mechanism onlyPMID:24882976View source ↗
AllantoinAnecdotal evidence6 citations

A gentle smoother and skin-soother. Reduces flakiness and helps the surface look more even.

Xu Z et al., Efficacy and Safety of Topical Compound Heparin Sodium Allantoin Gel for the Treatment of Rosacea, Journal of Cosmetic Dermatology 2025;24(4):e70129 — RCT (n=82, 12 weeks): allantoin gel improved erythema and alleviated itching/burning vs traditional therapy

2025Positive (efficacy)PMID:40177799View source ↗

Tan C et al., The combination of allantoin, bisabolol, D-panthenol and dipotassium glycyrrhizinate mitigates UVB-induced PGE2 synthesis by keratinocytes, International Journal of Cosmetic Science 2024;46(5):691-701 — in vitro: allantoin combination reduced UVB-induced PGE2, IL-1α, IL-6, IL-8, TNFα

2024Mechanism onlyPMID:38433250View source ↗

Saucedo-Acuna RA et al. (Mexico), Characterization and In Vivo Assay of Allantoin-Enriched Pectin Hydrogel for the Treatment of Skin Wounds, International Journal of Molecular Sciences 2023;24(8):7377 — allantoin-pectin hydrogel reduced wound healing time by ~71% with complete closure at day 15 in rat model

2023Mechanism onlyPMID:37108540View source ↗
DHHBModerate evidence2 citations

A modern UVA filter common in Korean and European sunscreens. It fills the long-wave UVA gap that UVB-focused filters cannot cover and is valued for remaining stable during sun exposure.

Ye F et al. Ultrafast excited-state energy dissipation pathway of diethylamino hydroxybenzoyl hexyl benzoate (DHHB) via the nanoparticles. Photochemical & Photobiological Sciences. 2023;22(9):2133-2142.

2023Mechanism onlyPMID:37195390View source ↗

Serpone N. Sunscreens and their usefulness: have we made any progress in the last two decades? Photochemical & Photobiological Sciences. 2021;20(2):189-244 — review of sunscreen-filter photochemistry, spectral coverage, stability, and formulation.

2021Mechanism onlyPMID:33721254View source ↗
Ethylhexyl TriazoneModerate evidence2 citations

A high-efficiency UVB filter behind many elegant high-SPF Korean and European formulas. It contributes strong burn protection without requiring the heavier filter load of less efficient UVB absorbers.

Serpone N. Sunscreens and their usefulness: have we made any progress in the last two decades? Photochemical & Photobiological Sciences. 2021;20(2):189-244 — review of sunscreen-filter photochemistry, spectral coverage, stability, and formulation.

2021Mechanism onlyPMID:33721254View source ↗

Sobanska AW, Pyzowski J. Quantification of sunscreen ethylhexyl triazone in topical skin-care products by normal-phase TLC/densitometry. ScientificWorldJournal. 2012;2012:807516.

2012Mechanism onlyPMID:22629203View source ↗
Polysilicone-15Moderate evidence2 citations

A polymeric UVB filter used to build lightweight, silky sunscreen textures. It supports SPF while its silicone backbone helps the formula spread into an even protective film.

Serpone N. Sunscreens and their usefulness: have we made any progress in the last two decades? Photochemical & Photobiological Sciences. 2021;20(2):189-244 — review of sunscreen-filter photochemistry, spectral coverage, stability, and formulation.

2021Mechanism onlyPMID:33721254View source ↗

Bens G. Sunscreens. Advances in Experimental Medicine and Biology. 2014;810:429-463 — review of organic and inorganic sunscreen filters, their spectral roles, formulation, and safety considerations.

2014Mechanism onlyPMID:25207381View source ↗

Sources: 10 clinical journals and regulatory databases across the US, EU, Korea, Japan, and China. Every entry points to a specific document. See methodology for the full list and what each outcome label means.

Layering conflicts

Ingredients in this product that can react with common actives. Avoid stacking unless noted.

  • Benzoyl peroxide breaks down vitamin C, making both less effective. Use one in the morning and the other at night.

  • Vitamin C and retinol work best at different pH levels. Use vitamin C in the morning and retinol at night.

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