Round Lab
Round Lab Birch Juice Moisturizing Sun Serum
Ingredient analysis and how the ad lines read
Read on 2026-09-11
What is this product?
Reach for this Round Lab birch sun serum if the goal is a watery, silicone led sunscreen finish with birch sap declared at 9.3 percent, the second entry after water, and skip it if organic UV filters sting your eyes, because there is no mineral filter in it at all. Five organic filters carry the UV protection, with niacinamide at position 8 and adenosine at 45 behind a functional cosmetic filing. One thing to know: the SPF 50+ and PA++++ designation appears in the platform listing name, and no brand surface or statutory notice in the collected material prints an SPF figure.
What makes it different?
Birch sap at 93,000ppm in second position is an unusually high and unusually specific disclosure for a sunscreen, where the vehicle is normally just water. The filter system is entirely organic with silica and three silicones doing the texture work, which is a different build from the tone up sibling in the same line that uses titanium dioxide and an iron oxide. The formula also stacks eight hyaluronic acid derivatives across the list.
What is in it?
The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know about that ingredient.
This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary.
Key ingredient
- Water
- Betula Platyphylla Japonica Juice
- Glycerin
- Dibutyl Adipate
- Butylene Glycol
- Ethylhexyl Triazone
- Terephthalylidene Dicamphor Sulfonic Acid
- Niacinamide
- Silica
- Dimethicone
- Tromethamine
- Polyglyceryl-6 Stearate
- Sodium Hyaluronate
- Artemisia Annua Extract
- Anthemis Nobilis Flower Oil
- Pinus Sylvestris Leaf Oil
- Aloe Barbadensis Leaf Extract
- Dioscorea Japonica Root Extract
- Laminaria Japonica Extract
- Ulmus Davidiana Root Extract
- Viola Mandshurica Flower Extract
- Water
- Hydrolyzed Hyaluronic Acid
- Hyaluronic Acid
- Diethylamino Hydroxybenzoyl Hexyl Benzoate
- Methyl Trimethicone
- Polysilicone-15
- Pentylene Glycol
- Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
- Hydroxyethyl Urea
- 1,2-Hexanediol
- Poly C10-30 Alkyl Acrylate
- Dimethicone/Vinyl Dimethicone Crosspolymer
- Hydroxyacetophenone
- Sodium Polyacryloyldimethyl Taurate
- Polyglyceryl-6 Behenate
- Glyceryl Stearate
- Hydroxypropyl Methylcellulose Stearoxy Ether
- Sodium Stearoyl Glutamate
- Methylpropanediol
- Polyether-1
- Glyceryl Glucoside
- Dehydroxanthan Gum
- Polyacrylate Crosspolymer-6
- Adenosine
- Arginine
- Caprylic Acid
- Dipropylene Glycol
- Cetearyl Olivate
- Sorbitan Olivate
- Hydrogenated Lecithin
- Betulin
- Hydroxypropyltrimonium Hyaluronate
- Sodium Acetylated Hyaluronate
- Sodium DNA
- Glycine
- Glutamic Acid
- Hydrolyzed Sodium Hyaluronate
- Sodium Hyaluronate Crosspolymer
- Potassium Hyaluronate
- Behenyl Alcohol
- Carbomer
- Cetearyl Alcohol
Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.
We could not place these in the list above: 캐모마일꽃오일, 구주소나무잎오일, 폴리글리세릴-6스테아레이트, 글리세릴스테아레이트, 폴리글리세릴-6베헤네이트, 세테아릴올리베이트, 솔비탄올리베이트, 세테아릴알코올, 베헤닐알코올
Did the ad claims hold up?
We checked the one line this product advertises against the ingredient list and public documents. One of them looks likely, though none are proven outright.
Claims translated from Korean, originals preserved.
likely, not proven1
- Ultra-light
Korean original
초경량
Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.