The definitive version of COSRX's birch sap moisturizer — everything the original did well, minus the essential oils that never should have been there. This fragrance-free, oil-free reformulation is one of the lightest and most pleasant daily moisturizers for oily and combination skin, with a 70% birch sap base that actively soothes rather than just sitting there. Not for dry skin, but for its audience, it's nearly ideal.
Oil-Free Ultra-Moisturizing Lotion with Birch Sap
The definitive version of COSRX's birch sap moisturizer — everything the original did well, minus the essential oils that never should have been there. This fragrance-free, oil-free reformulation is one of the lightest and most pleasant daily moisturizers for oily and combination skin, with a 70% birch sap base that actively soothes rather than just sitting there. Not for dry skin, but for its audience, it's nearly ideal.
Score Breakdown
Where this product gains points and where it loses them — broken down across the four scoring pillars.
A clean, well-reformulated lightweight moisturizer with a functional birch sap base and proven supporting ingredients. The removal of essential oils significantly improves suitability for sensitive skin. Held back slightly by the dimethicone inclusion and the inherent limitation of being too lightweight for dry skin.
Pros & Cons
- ✓70% birch sap base provides clinically demonstrated anti-inflammatory benefits from the vehicle itself
- ✓Reformulation removes all fragrance, essential oils, and fragrance allergens — truly irritant-free
- ✓Ultra-lightweight texture absorbs in seconds with zero greasy residue
- ✓4-terpineol retains tea tree's antimicrobial benefit without the sensitization risk
- ✓Pump dispenser provides hygienic, precise dispensing with clear bottle for product visibility
- ✓Vegan, cruelty-free, fragrance-free, and paraben-free with a clean 19-ingredient list
- ✓Excellent base for sunscreen and makeup without pilling
- ✗Not moisturizing enough for dry skin or cold/arid climates as a standalone product
- ✗Dimethicone (4th ingredient) may aggravate closed comedones in susceptible users
- ✗100ml size depletes in 2-3 months with twice-daily use — a larger size would improve value
- ✗So lightweight that some users feel they haven't applied anything at all
- ✗Not silicone-free, which limits appeal for the clean-beauty-conscious consumer
Full Review
Sometimes the best thing a brand can do is admit it got something wrong. The original COSRX Oil-Free Ultra-Moisturizing Lotion was a genuinely innovative product — 70% birch sap replacing water, oil-free hydration that actually worked, a texture so light it practically evaporated on contact. It earned a devoted following. But it also contained lemon peel oil, tea tree oil, and their associated fragrance allergens, creating an irritation liability that contradicted the product's gentle positioning. Sensitive-skin users who loved the concept kept getting burned by the execution.
The 'with Birch Sap' reformulation is COSRX doing what good brands do: keeping what works and cutting what doesn't. Out went the lemon peel oil, the tea tree oil, the Parfum, the limonene, the citral. In came 4-terpineol — the isolated antimicrobial compound that gives tea tree oil its functional value, extracted from the botanical noise that causes sensitization. It's a surgical fix. And it results in a product that's finally as gentle as it always wanted to be.
The 70% birch sap base remains the formula's defining feature. Betula platyphylla japonica juice isn't water with a fancy name — it's a nutrient-rich sap containing minerals, amino acids, and polyphenolic compounds that standard purified water simply doesn't possess. Research has begun catching up to what traditional Korean medicine has long claimed: a 2023 clinical study demonstrated birch juice's ability to reduce skin nerve sensitivity with regular topical use, and a 2025 study confirmed its capacity to attenuate inflammatory cytokine production through both the MAPK and NF-κB pathways. When your moisturizer's base is anti-inflammatory before the actives enter the picture, that's not marketing — that's smart formulation.
The supporting cast is lean and effective. Glycerin and betaine provide humectant hydration. Panthenol reduces transepidermal water loss and supports barrier repair. Sodium hyaluronate binds moisture at the skin's surface. Allantoin soothes and promotes cell renewal. Dimethicone creates a lightweight silicone film that prevents all this moisture from evaporating — the occlusive layer that oil-free formulas need to actually retain the hydration they deliver.
The dimethicone deserves honest discussion. Listed fourth on the INCI, it's present at a meaningful concentration. For the vast majority of users, dimethicone is perfectly safe and beneficial — it creates a breathable, protective barrier that feels silky rather than heavy. But for a subset of users prone to closed comedones, silicones can trap sebum and dead cells beneath the film, potentially worsening congestion. If you know silicones break you out, this product isn't going to change that. The oil-free claim is about the absence of traditional oils, not the absence of occlusive ingredients.
The texture remains this lotion's greatest asset. It's hard to overstate how light this product feels. You pump out a small amount, spread it across your face, and within seconds it has vanished. No greasy film. No tacky residue. No visible layer. Just soft, hydrated skin that looks the same as it did before application — except it's not tight, not dry, and not shiny. For oily skin types who've internalized the belief that moisturizer means heaviness, this is deprogramming in a bottle.
The fragrance-free profile is a significant upgrade. Where the original announced its presence with a medicinal tea tree aroma, this version smells like nothing. For sensitive-skin users, for people who layer multiple products, for anyone who doesn't want their moisturizer's scent competing with their sunscreen or makeup — the silence is welcome.
Performance is consistent with the original's strengths: balanced hydration for oily and combination skin without contributing to midday shine. The birch sap's soothing properties are noticeable over time — regular users report calmer, less reactive skin after several weeks. The 4-terpineol replacement maintains the original's antimicrobial character without the essential oil's volatility.
At $25 for 100ml retail — with frequent discounts to the $16-20 range on K-beauty retailers — the value is solid. The pump dispenses precisely, the clear bottle shows remaining product levels, and two pumps per application means the bottle lasts two to three months. A 20ml mini exists for those who want to trial before committing.
The limitation is unchanged from the original: this is a lightweight moisturizer for oily and combination skin. Dry skin will not be satisfied. Cold, arid climates will outstrip its hydrating capacity. It's a specialist, not a generalist, and it excels within its lane.
The COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap is the product the original should have been from the start. Same innovative birch sap base. Same vanishing texture. Same effective humectant system. Just cleaned up, stripped down, and finally safe for the sensitive skin types that need it most. It's not a revolutionary change — it's a correct one. And sometimes, that's more valuable.
Formula
Key Ingredients
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| Betula Platyphylla Japonica Juice (Birch Sap) (70%) | The formula's bioactive base at 70% concentration, replacing standard water with a nutrient-rich sap containing minerals, amino acids, and antioxidants. Research has demonstrated birch sap's ability to reduce inflammatory cytokines and decrease skin nerve sensitivity. In this clean reformulation, the birch sap has more room to shine without competing against potentially irritating essential oils. | promising |
| Panthenol (Vitamin B5) | Provides barrier-supporting moisture retention, converting to pantothenic acid on skin. Works synergistically with the birch sap's anti-inflammatory action to soothe and hydrate simultaneously. Decades of clinical research confirm panthenol's ability to reduce transepidermal water loss — critical in an oil-free formula that relies on humectant hydration. | well-established |
| Sodium Hyaluronate | Draws and binds water molecules to the skin's surface, compensating for the absence of occlusive oils. In this lightweight lotion, sodium hyaluronate provides the surface-level hydration that makes skin feel plump and smooth while the dimethicone prevents it from evaporating. | well-established |
| 4-Terpineol | An isolated component of tea tree oil that provides the antimicrobial and soothing benefits without the full essential oil's irritation risk. COSRX specifically chose this ingredient to replace the original formula's tea tree leaf oil, retaining the functional benefit while dramatically reducing the sensitization potential. | promising |
| Allantoin | An FDA-recognized skin protectant providing soothing and cell-renewal support. In this gentle, fragrance-free reformulation, allantoin reinforces the overall calming profile rather than compensating for irritating ingredients — it's free to do its job without having to buffer essential oils. | well-established |
Full INCI List
Betula Platyphylla Japonica Juice, Butylene Glycol, Glycerin, Dimethicone, Betaine, Cetearyl Alcohol, 1,2-Hexanediol, Cetearyl Olivate, Sorbitan Olivate, Ethylhexylglycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Ethyl Hexanediol, Xanthan Gum, Allantoin, Panthenol, Sodium Hyaluronate, Sodium Lactate, 4-Terpineol, Water
Product Flags
✓ Fragrance Free✓ Alcohol Free✓ Oil Free✗ Silicone Free✓ Paraben Free✓ Sulfate Free✓ Cruelty Free✓ Vegan✗ Fungal Acne Safe
Compatibility
Skin Match
Best For
Works For
Not Ideal For
Addresses These Conditions
oiliness dehydration acne sensitivity
Use With Caution
Routine Step
moisturizer
Time of Day
AM & PM
Pregnancy Safe
Yes ✓
Layering Tips
Apply 1-2 pumps after toner and serum. The fast-absorbing texture makes it an ideal base for sunscreen in the AM. For dry skin or cold climates, layer a richer cream or sleeping mask on top. For oily skin in humid weather, this may be all you need.
Results Timeline
Immediate lightweight hydration and balanced, non-greasy feel from first use. Within 1-2 weeks, skin should feel consistently more hydrated and less reactive. The birch sap's calming benefits become most apparent after 3-4 weeks of daily use, with reduced redness and improved skin comfort.
Pairs Well With
hyaluronic acid serumsniacinamide serumsBHA treatmentslightweight sunscreensretinol treatments
Sample AM Routine
- Low pH cleanser
- Hydrating toner
- Niacinamide serum
- COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap
- Lightweight sunscreen
Sample PM Routine
- Oil cleanser
- Gentle cleanser
- Exfoliant or treatment
- Hydrating toner
- COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap
Evidence
Science & Expert Perspective
The Science
The formula's foundation is 70% Betula platyphylla japonica juice (birch sap), positioning the vehicle itself as a bioactive ingredient. Birch sap contains a complex matrix of minerals, amino acids, organic acids, and polyphenolic compounds. A 2023 clinical study published in PMC demonstrated that topical birch juice application reduced sensitivity of skin sensory nerves after 2-4 weeks, providing evidence for the sap's calming properties beyond simple hydration. A 2025 study in MDPI's Cosmetics journal revealed that birch sap significantly reduced inflammatory cytokines IL-1β, IL-6, and IL-8, and attenuated both MAPK and NF-κB phosphorylation pathways — key inflammatory signaling cascades — in cellular and animal models.
The reformulation's key ingredient addition is 4-terpineol, an isolated monoterpene alcohol found naturally in tea tree oil. Unlike the full essential oil, which contains over 100 compounds including potential sensitizers, 4-terpineol delivers targeted antimicrobial and anti-inflammatory activity with significantly reduced sensitization risk. This approach reflects a growing trend in cosmetic chemistry toward using isolated bioactive compounds rather than complex essential oils.
Panthenol's contribution is supported by Proksch et al.'s comprehensive 2017 review in The Journal of Dermatological Treatment, which documented 70 years of evidence for dexpanthenol's moisturizing, barrier-enhancing, and anti-inflammatory properties. In an oil-free formula that relies on humectant hydration, panthenol's documented ability to reduce transepidermal water loss is particularly critical. Sodium hyaluronate provides complementary surface-level moisture binding, while dimethicone serves as the formula's occlusive — creating a breathable silicone film that prevents humectant-delivered moisture from evaporating.
References
- Clinical study on birch juice spray reducing skin sensory nerve sensitivity — PMC (2023)
- Betula platyphylla var. japonica bark extract inhibits atopic dermatitis-like skin lesions — PubMed (2008)
- Topical use of dexpanthenol: a 70th anniversary article — The Journal of Dermatological Treatment (2017)
Dermatologist Perspective
Dermatologists appreciate the reformulation's removal of essential oils and fragrance allergens, making this product significantly more recommendable for sensitive and reactive skin types. Board-certified dermatologists note that oil-free moisturizers with humectant-based hydration systems are appropriate for patients with acne-prone or oily skin, and the 70% birch sap base adds anti-inflammatory value beyond simple hydration. The inclusion of isolated 4-terpineol rather than full tea tree essential oil reflects current best practices in cosmetic formulation — delivering targeted activity while minimizing sensitization risk. Dermatologists would advise patients prone to closed comedones to monitor for any reaction to the dimethicone component.
Guidance
Usage Guide
How to Use
After cleansing, toning, and applying serums, dispense 1-2 pumps and spread across face and neck. The gel-lotion texture needs no rubbing — it absorbs on contact. In the AM, wait 1-2 minutes before applying sunscreen. In the PM, this can be the final step for oily skin, or layer a sleeping mask or richer cream on top for dry skin. Use morning and evening for balanced, oil-free hydration.
Value Assessment
At $25 retail for 100ml, this lotion offers reasonable value for a birch-sap-based moisturizer with a clean, reformulated ingredient profile. The true value emerges at K-beauty retailer pricing ($16-20), where it becomes one of the most affordable well-formulated oil-free moisturizers available. A 20ml travel size reduces purchase risk for newcomers. With 1-2 pumps per application twice daily, the standard bottle lasts 2-3 months at a daily cost of approximately $0.30-0.40. COSRX's established decade-long track record and the product's strong review history support the pricing.
Who Should Buy
Oily and combination skin types seeking a fragrance-free, oil-free daily moisturizer that provides real hydration without heaviness. Especially ideal for those who found the original version's essential oils irritating, sensitive skin types building gentle routines, anyone who needs a lightweight moisturizer that layers invisibly under sunscreen and makeup, and retinol users seeking a non-irritating post-treatment moisturizer.
Who Should Skip
Dry skin types who need substantial moisture — this will not be enough on its own. Anyone who avoids silicones due to closed comedone sensitivity should consider silicone-free alternatives. Users who specifically loved the original's tea tree scent and feel may find this reformulation's neutrality disappointing.
Ready to try COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap?
Details
Details
Texture
Light, silky gel-lotion that turns almost watery upon spreading. Absorbs rapidly and leaves skin feeling like nothing is there — just soft, hydrated skin.
Scent
Fragrance-free with no discernible scent. A dramatic improvement over the original's medicinal tea tree aroma.
Packaging
Tall, clear/translucent plastic pump bottle with minimalist COSRX labeling. The pump mechanism provides precise, hygienic dispensing and the clear body lets you see remaining product levels. Also available in a 20ml travel size.
Finish
satinnon-greasylightweight
What to Expect on First Use
Expect a moisturizer that essentially disappears on contact. The gel-lotion turns watery as you spread it and absorbs within seconds, leaving zero greasy residue. If you're accustomed to richer creams, this will feel like you didn't apply anything — but your skin is genuinely hydrated beneath the surface. No tingling, no scent, no adjustment period.
How Long It Lasts
2-3 months with twice-daily facial use
Period After Opening
12 months
Best Season
spring summer
Certifications
cruelty-freevegandermatologist-testedhypoallergenic
Background
The Why
The original COSRX Oil-Free Ultra-Moisturizing Lotion launched in 2016 and became a cult favorite for oily skin, but its essential oils were a persistent point of criticism. When COSRX committed to removing unnecessary irritants from their line, this was one of the key products to receive the clean-up treatment. The 'with Birch Sap' reformulation arrived around 2021, stripping out fragrance, lemon oil, tea tree oil, and their associated allergens while adding 4-terpineol as a targeted replacement.
About COSRX Established Brand (5–20 years)
COSRX was founded in 2013 in South Korea and is one of K-beauty's most trusted brands. This reformulated version replaced the original Oil-Free Ultra-Moisturizing Lotion by removing essential oils and fragrance allergens, reflecting the brand's commitment to reducing irritation risk.
Brand founded: 2013 · Product launched: 2021
Myth vs. Reality
Myths & Misconceptions
Myth
The reformulated version is weaker because they removed the tea tree oil.
Reality
COSRX replaced the full tea tree essential oil with 4-terpineol — the specific active compound responsible for tea tree's antimicrobial and soothing properties. By isolating this component, the reformulation retains the functional benefit while eliminating the ~40+ other compounds in tea tree oil that can cause skin sensitization. It's a precision upgrade, not a downgrade.
Myth
Oil-free means this won't clog pores.
Reality
While the absence of oils reduces comedogenic risk, this formula contains dimethicone (a silicone) which can trap debris in pores for some users prone to closed comedones. Oil-free doesn't automatically mean non-comedogenic — individual ingredient sensitivity matters more than broad 'oil-free' claims.
FAQ
Frequently Asked Questions
What's different about the 'with Birch Sap' version compared to the original?
The reformulation removed lemon peel oil, tea tree leaf oil, fragrance (Parfum), and fragrance allergens (limonene, citral). In their place, COSRX added 4-terpineol — the isolated antimicrobial compound from tea tree oil — which provides the same functional benefit without the sensitization risk. The core formula (70% birch sap, panthenol, allantoin, sodium hyaluronate) remains the same.
Is this moisturizer enough for dry skin?
This lotion is designed for oily and combination skin. For dry skin, it will likely feel insufficient as a standalone moisturizer, especially in cold or dry climates. You can use it as a lightweight hydrating layer under a richer cream, but if your skin is genuinely dry, look for a ceramide-based moisturizer with more occlusive ingredients.
Does this lotion contain silicone?
Yes — dimethicone is the fourth ingredient. It creates a smooth, breathable protective film that helps lock in moisture without oils. Most users tolerate dimethicone well, but those prone to closed comedones or who prefer silicone-free products should consider alternatives.
Is this product fragrance-free?
Yes — the reformulated version removed all fragrance ingredients including Parfum, lemon peel oil, and tea tree leaf oil. It has no detectable scent, making it suitable for sensitive and fragrance-reactive skin types.
Can I use this with retinol?
Yes — the gentle, soothing formula with panthenol, allantoin, and birch sap makes it a good companion for retinol treatments. Apply your retinol first, wait a few minutes for absorption, then follow with this lotion to provide lightweight hydration without adding oils that could interfere with retinoid absorption.
Is this product vegan and cruelty-free?
Yes — the reformulated version contains no animal-derived ingredients and COSRX does not test on animals. However, COSRX is not certified by Leaping Bunny or PETA, and the brand is partially owned by Amorepacific, which some consumers consider when evaluating cruelty-free status.
Community
Community Voices
Common Praise
"Ultra-lightweight and non-greasy — absorbs in seconds with no residue"
"Fragrance-free reformulation is much gentler on sensitive skin than the original"
"Keeps oily and combination skin hydrated without contributing to shine"
"Silky, smooth application that works perfectly as a sunscreen and makeup base"
"Clean, short ingredient list inspires confidence in the formulation"
"Pump bottle is hygienic and dispenses the right amount easily"
Common Complaints
"Not moisturizing enough for dry skin as a standalone product — needs layering"
"Contains dimethicone, which some users with closed comedones find aggravating"
"100ml bottle runs out relatively quickly with twice-daily use"
"Some users who loved the original's tea tree scent find this version too neutral"
Appears In
best moisturizer for oiliness best oil free moisturizer k beauty best lightweight moisturizer for acne best fragrance free moisturizer for oily skin
Related Conditions
oiliness dehydration acne sensitivity
Related Ingredients
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