Round Lab
Birch Juice Moisturizing Serum
Round Lab Birch Juice Moisturizing Serum (50 ml) is a serum for anyone who wants a concentrated middle step in their routine, used after your toner or essence and before your moisturizer.
No reviews yet50 ml
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Normal skinDry skinCombination skinSkin that runs sensitive
- Helps with
- A concentrated middle step between watery prep and a sealing moisturizerA specific concern that a moisturizer alone is spread too thin to addressLayering room between a toner and cream
In stock. Ships from California or direct from Korea
You’re $100.00 away from free US shipping.
Next step in this routine
- Cleanse
- Prep
- Treat
- Sealnext
- Morning finish
Medicube PDRN Pink Collagen Capsule CreamSeal the routine in as the last step
$19.99
Also standing in Seal: Dr. Althea 345 Relief Cream, $23.52.
- Ships from California or direct from Korea
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
Key benefits
- Birch sap is declared at 10,000 ppm, one percent, at position seven
- Three hyaluronate forms, sodium hyaluronate, glyceryl glucoside and hydrolyzed hyaluronic acid, run consecutively at eight through ten
- Ascorbic acid, plain vitamin C, sits at thirteen for a brightening lift alongside the hydration work
- Thirteen distinct botanical extracts run from position eighteen through thirty, a genuinely wide base rather than one hero plant
- Beta-glucan and dipotassium glycyrrhizate support comfort mid list
- No fragrance, no parfum, no essential oil anywhere on it
Key actives
8Sodium Hyaluronate
A smaller-molecule form of hyaluronic acid that spreads easily and helps the finish feel dewy rather than heavy.
10Hydrolyzed Hyaluronic Acid
A low-molecular-weight form of hyaluronic acid, included for a lighter, faster-absorbing hydration layer than the standard-weight form alone would give this particular formula.
12Hyaluronic Acid
A water-binding humectant that helps the surface feel plumper and less tight through the day, sitting on skin rather than sinking below it.
13Ascorbic Acid (Vitamin C)
Direct vitamin C, included in this formula's brightening blend and best paired with sunscreen since it can lose potency with light exposure.
Birch Sap (Betula Juice)
Birch sap carried at a named concentration in this formula, the ingredient Round Lab's Birch Juice line is named for and used here as its central hydrating ingredient.
Inside the formula
Inside the formula
- 8Sodium Hyaluronate
- 12Hyaluronic Acid
Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.
Is this the same formula sold in Korea, or a version made for the US market?
This is the Korean-market formula, the same one sold on shelves in Korea, not a separate version reformulated for US retail. The pack you open matches what a shopper in Seoul buys.
Where does this step go in a routine?
It belongs after your toner or essence and before your moisturizer, the concentrated middle step of a routine. Placing it earlier or later than that changes how it feels going on and how well the steps after it absorb, so keeping it in that order is worth doing even on a simplified routine.
Can I use this if my skin runs sensitive?
This serum is formulated with skin types like normal skin, dry skin in mind, but any new product is worth a patch test first if your skin reacts easily. A short patch test on the inside of your arm or behind an ear is worth doing with any new product before it goes on your face, and that goes for sensitive skin most of all.
How long before I will know if this is right for my skin?
Give it a full week or two of consistent use before judging, since a single use rarely tells you much either way. Watch for how skin feels rather than for any specific number, and stop use if you notice ongoing irritation.
Not on the ingredient list below: fragrance or parfum, denatured or SD alcohol, essential oils, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (40): Water, Methylpropanediol, Glycerin, 1,2-Hexanediol, Polyglycerin-3, Caprylic/Capric Triglyceride, Betula Platyphylla Japonica Juice (10,000ppm), Sodium Hyaluronate, Glyceryl Glucoside, Hydrolyzed Hyaluronic Acid, Butylene Glycol, Hyaluronic Acid, Ascorbic Acid, Beta-Glucan, Dipotassium Glycyrrhizate, Hydrogenated Lecithin, Ethylhexylglycerin, Eclipta Prostrata Leaf Extract, Laminaria Japonica Extract, Avena Sativa (Oat) Kernel Extract, Cynara Scolymus (Artichoke) Leaf Extract, Pteris Multifida Extract, Melia Azadirachta Leaf Extract, Melia Azadirachta Flower Extract, Coccinia Indica Fruit Extract, Aloe Barbadensis Flower Extract, Solanum Melongena (Eggplant) Fruit Extract, Ocimum Sanctum Leaf Extract, Corallina Officinalis Extract, Curcuma Longa (Turmeric) Root Extract, Cyclohexasiloxane, Dipropylene Glycol, Ammonium Acryloyldimethyltaurate/VP Copolymer, Xanthan Gum, Fructooligosaccharides, Carbomer, Disodium EDTA, Polyquaternium-51, Tromethamine, Tocopherol
Ingredient list read from incidecoder.com on 30 August 2026.
39 of 40 explained
- Water solvent
- Water is the base almost every serum, toner and cream is built on. It dissolves the water-loving ingredients and sets how light the finished texture feels. On an INCI list it is usually first, which only means it is the largest single ingredient by weight.
- Methylpropanediol humectant
- Methylpropanediol is a small glycol used to hydrate and to help water-soluble actives penetrate the outer layer of skin more evenly. It leaves almost no tack, which suits watery textures.
- Glycerin humectant
- Glycerin is the most used humectant in skincare. It draws water into the outer layer of skin and holds it there, and it is one of the very few ingredients whose hydrating effect is settled science rather than marketing. Higher amounts feel tacky, which is why it is usually blended.
- 1,2-Hexanediol humectant
- 1,2-Hexanediol is a glycol used for two reasons: it holds water like glycerin, and it makes a formula harder for microbes to live in, so less traditional preservative is needed. Korean formulas use it heavily for that second reason.
- Polyglycerin-3 humectant
- Polyglycerin-3 is a short chain of glycerin units used as a gentler, less sticky humectant. It also helps oils and water stay blended.
- Caprylic/Capric Triglyceride emollient
- Caprylic/Capric Triglyceride is the light fraction of coconut oil, with the heavy parts removed. It is the workhorse emollient of modern formulas: it softens skin, dissolves oil-soluble actives and absorbs without the greasy weight of a whole plant oil.
- Betula Platyphylla Japonica Juice (10,000ppm) plant extract
- Betula Platyphylla Japonica Juice is Asian white birch sap, tapped in spring. It is over 98 percent water with trace minerals and sugars, and Korean formulas use it in place of plain water as a hydrating base.
- Sodium Hyaluronate humectant
- Sodium Hyaluronate is the salt of hyaluronic acid, and it is what most products labelled hyaluronic actually contain. The salt dissolves more readily and the molecule is smaller, so it sits in the outer layer of skin rather than only on top of it.
- Glyceryl Glucoside humectant
- Glyceryl Glucoside is glycerin bound to glucose, from the resurrection plant. It is a humectant that holds water in the outer layer of skin.
- Hydrolyzed Hyaluronic Acid humectant
- Hydrolyzed Hyaluronic Acid is hyaluronic acid cut into much shorter fragments. The smaller the fragment, the further into the outer layer it can settle, which is why serums stack several sizes together instead of using one.
- Butylene Glycol humectant
- Butylene Glycol is a small glycol that does two jobs at once: it holds water in the top layer of skin and it dissolves plant extracts and actives that plain water cannot. It also thins a formula, which is why watery Korean essences lean on it.
- Hyaluronic Acid humectant
- Hyaluronic Acid is a sugar chain the body already makes, and one gram of it can hold several litres of water. In a formula it is a humectant that pulls water to the surface of skin and holds it in a film, which is what makes skin look plumper while it is there.
27 more explained
- Ascorbic Acid antioxidant
- Ascorbic Acid is pure vitamin C, the most researched form and also the least stable: it needs a low pH and airtight packaging to stay active. It is an antioxidant used for the look of dullness and uneven tone.
- Beta-Glucan polysaccharide
- Beta-Glucan is a polysaccharide from oats or yeast. It holds a large amount of water, forms a soothing film, and is one of the ingredients formulators reach for in products aimed at reactive skin.
- Dipotassium Glycyrrhizate active
- Dipotassium Glycyrrhizate is a water-soluble salt derived from licorice root. It is the licorice fraction Korean formulas use for the look of redness, and it is far more stable in water than the whole extract.
- Hydrogenated Lecithin emulsifier
- Hydrogenated Lecithin is lecithin with its unsaturated bonds filled in, which makes it far more stable. It emulsifies and is the standard shell for the liposomes that carry actives into the outer layer of skin.
- Ethylhexylglycerin preservative booster
- Ethylhexylglycerin softens skin and boosts a preservative system, which is why it is nearly always sitting beside phenoxyethanol or 1,2-hexanediol. It also cuts down the odour bacteria produce, so it turns up in deodorising products.
- Eclipta Prostrata Leaf Extract plant extract
- Eclipta Prostrata is false daisy, long used in Ayurvedic and East Asian practice. Its extract is used as a conditioning plant extract, most often in scalp and hair formulas.
- Laminaria Japonica Extract plant extract
- Laminaria Japonica is kombu kelp. Its extract carries alginates, minerals and iodine, and it is used as a hydrating, mineral-rich ingredient.
- Avena Sativa (Oat) Kernel Extract plant extract
- Oat Kernel Extract carries beta-glucan and avenanthramides, and it is one of the most reliably tolerated ingredients in skincare. It is used for the look of reddened, itchy-feeling skin.
- Cynara Scolymus (Artichoke) Leaf Extract plant extract
- Artichoke Leaf Extract carries cynaropicrin and other plant antioxidants. It is used in formulas aimed at the look of visible pores and dullness.
- Pteris Multifida Extract plant extract
- Spider brake fern extract, a traditional East Asian herbal plant. It is used as a conditioning extract.
- Melia Azadirachta Leaf Extract plant extract
- Melia Azadirachta is neem. Its leaf and flower extracts are long-standing Ayurvedic ingredients, and Korean formulas use them in products aimed at the look of congested, blemish-prone skin.
- Coccinia Indica Fruit Extract plant extract
- Coccinia Indica is ivy gourd. Its fruit extract is used as a conditioning, hydrating plant extract in Korean formulas.
- Aloe Barbadensis Flower Extract plant extract
- Aloe Flower Extract comes from the flower rather than the leaf gel. It is used as a conditioning plant extract.
- Solanum Melongena (Eggplant) Fruit Extract plant extract
- Eggplant Fruit Extract carries nasunin, the antioxidant pigment in aubergine skin. It is used as an antioxidant plant extract.
- Ocimum Sanctum Leaf Extract plant extract
- Ocimum Sanctum is holy basil, or tulsi. Its leaf extract carries plant antioxidants and is used in formulas built for the look of stressed, reactive skin.
- Corallina Officinalis Extract plant extract
- Corallina Officinalis is coral seaweed, which holds calcium and magnesium in its structure. Its extract is used as a mineral-rich conditioning ingredient.
- Curcuma Longa (Turmeric) Root Extract plant extract
- Turmeric Root Extract carries curcuminoids, well studied plant antioxidants. It is used for the look of dullness and uneven tone, and it tints a formula faintly yellow.
- Cyclohexasiloxane silicone
- Cyclohexasiloxane is a volatile silicone used for a light, fast-spreading feel that leaves nothing behind.
- Dipropylene Glycol humectant
- Dipropylene Glycol is a glycol used as a solvent and a light humectant. Its main job is keeping the rest of the formula dissolved and the texture fluid rather than adding hydration of its own.
- Ammonium Acryloyldimethyltaurate/VP Copolymer thickener
- This is a synthetic thickener that gels quickly and holds an emulsion stable across a wide pH range. It gives a light, non-tacky body.
- Xanthan Gum thickener
- Xanthan Gum is a polysaccharide made by fermenting sugar. It thickens a watery formula into a gel and holds the whole thing in suspension so nothing separates. Too much of it and a serum turns stringy, which is why it appears in fractions of a percent.
- Fructooligosaccharides humectant
- Fructooligosaccharides are short fructose chains used as humectants and as food for the skin's own resident microbes.
- Carbomer thickener
- Carbomer is a synthetic polymer that only gels once a base neutralises it, which is why arginine or tromethamine sits nearby on the list. It gives the clear, non-stringy gel texture a xanthan formula cannot reach.
- Disodium EDTA chelator
- EDTA is a chelator: it locks up trace metal ions from water and packaging that would otherwise turn a formula cloudy, off-colour or rancid. It does nothing to skin and appears at a fraction of a percent.
- Polyquaternium-51 film former
- Polyquaternium-51 is a polymer, sometimes sold as Lipidure, built on the same phosphorylcholine structure as a cell membrane. It holds water in a film on the surface and gives a distinctive soft, dry finish.
- Tromethamine pH adjuster
- Tromethamine neutralises acidic thickeners such as carbomer so they gel, and holds a formula near skin-friendly pH. It is used at a fraction of a percent.
- Tocopherol antioxidant
- Tocopherol is vitamin E. It is an oil-soluble antioxidant that protects the oils in a formula from going rancid and works on skin as an emollient, and it is regularly paired with vitamin C because each keeps the other going for longer.
- EAN (barcode)
- 8809782553009
- Made in
- Republic of Korea
- Volume
- 50 ml
- Category
- Serum & Ampoule / Hydrating Serum
- Actives
- Aloe Vera, Beta-Glucan, Birch Sap, Hyaluronic Acid, Licorice Root, Sodium Hyaluronate, Vitamin C
- Ships from
- California or Korea
Orders ship from California or direct from Korea with tracked delivery to your door, and both routes carry the same Korean-market release. Shipping is free on orders of $100 or more. Returns are accepted for 30 days, by mail.
We split shipments free, so one out-of-stock item never holds up the rest of your order.
Where this unit came from
- 1Seoul
Bought as Korean-market stock - 2Barcode
Listed against the Korean barcode on its box - 3California or Korea
Ships to you from either, as the same Korean-market release
We stock the version of a formula that is sold in Korea, not the release a brand prepares for another market under the same name. The barcode in the specification above is the Korean-market one and it is printed on the box you receive.
Every unit keeps its original barcode and batch code intact, so the unit in your hands can be checked against the brand’s own records.
Every order ships from California or direct from Korea, and returns run for 30 days.
Every claim on this page traces to the unit in the box, the barcode, the batch code and the price you can read for yourself.
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How it works
Round Lab Birch Juice Moisturizing Serum is built as a serum, so its texture and finish are designed around one specific place in a routine rather than several. The formula's own ingredient list carries Hyaluronic Acid, Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid among its named ingredients, placed at a level consistent with a serum rather than a spot treatment. The texture is built for use after your toner or essence and before your moisturizer, the concentrated middle step of a routine, which is why it behaves differently on skin than a product meant for a different point in a routine. This is the Korean-market formula of the birch juice moisturizing serum, the version sold on shelves in Korea rather than a formula reworked for a different market.
How to use
- AM and PM, after toner and before a heavier cream. Apply to damp skin so the hyaluronates have water to hold onto.
- Two to three drops, pressed evenly over the face and neck rather than rubbed in.
- If using a vitamin C serum for the first time, patch test on the inner arm first and introduce it every other day.
- Follow with a moisturizer, and with sunscreen every morning since vitamin C works best alongside daily sun protection.
Worth knowing
- Introduce a new serum gradually rather than every day at first, so it is easier to tell if skin is reacting to it specifically.
- Seal it with a moisturizer rather than leaving it to sit alone, since a serum is a middle step and not built to finish a routine.
Reviews
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Round Lab Birch Juice Moisturizing Serum
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
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Round Lab, Korean-market original
Birch juice serum, 50 ml, birch sap at 10,000 ppm, three hyaluronate forms.
Verify your unit when it arrives
Verify your unit when it arrives
Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.
On the unit itself
- The Korean-market barcode, unaltered from the retail package.
- The manufacturer’s batch code, exactly as the maker printed it.
정품Genuine article, Korean-market stock
What professionals say
What professionals say
What skin-care professionals say about the key actives in this formula, quoted from the medical sources linked beside each.
Hyaluronic acid helps bind water to collagen, which traps water in the skin. That helps make the skin more plump and full-looking.
Samantha Stein, PA-CDermatology physician assistant, Cleveland Clinic It helps to reduce inflammation of the skin and retain moisture to maintain the barrier function of skin.
Dr. Jaishree SharadDermatologist, Femina
1 more professional perspective
Using topical vitamin C can result in less cell damage and better-looking skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic
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