ROUND LAB Birch Juice Moisturizing Sunscreen — Crème Solaire Hydratante SPF50+

Hard to find a sunscreen that protects as much as it hydrates — this one meets the challenge with next-generation filters and calibrated moisturizing actives.

Inje Birch Sap (Betula Platyphylla Japonica Juice) : dosed at 1425 ppm, this sap harvested in spring from the Inje forests contains 17 amino acids, minerals, and antioxidants. It quenches the epidermis, soothes redness, and supports the natural NMF.

Trio of highly stable chemical UV filters : Diethylamino Hydroxybenzoyl Hexyl Benzoate (Uvinul A Plus) covers long UVA with remarkable photostability, while Ethylhexyl Triazone offers the most stable UVB protection on the marketNo formula that turns yellow or requires reapplication every hour.

Niacinamide (vitamin B3) : used at 4-5%, it boosts ceramide synthesis for a stronger hydrolipidic film, reduces brown spots, and controls shine — a true Swiss army knife against UV.

Hyaluronic Acid in two molecular weights (Sodium Hyaluronate + Hyaluronic Acid): the short form penetrates deeply, the long form maintains surface hydration. This duo can hold up to 1000 times its weight in water.

Ascorbic Acid (pure vitamin C) : stimulates collagen, fades pigmentation, and neutralizes free radicals triggered by UV raysAn antioxidant shield that boosts the action of the filters.

Adenosine : an anti-aging molecule validated in Korea, it smooths emerging wrinkles and accelerates cell regeneration. Present in all Round Lab premium skincare.

☀️ Morning routine

1. After your serum or essence, apply the equivalent of two fingers' worth of product to your face and neck.
2. Spread evenly as if creating a protective shield — focus on the forehead, nose, and cheekbones.
3. Wait 2 to 3 minutes for the texture to absorb before applying your makeup (the formula works as an excellent base).
4. Reapply every two hours in case of prolonged exposure, swimming, or sweating.

🌙 Evening routine

1. Thoroughly cleanse with cleansing oil, then with cleansing gel to remove chemical filters — double cleansing is essential.

💡 Texture tip : The cream has a watery texture that thickens slightly when layered, but it absorbs quickly and leaves a naturally rosy finish. Combination skin: it can replace your day cream in summer.

Winning profiles

• Dry to combination skin seeking a nourishing sunscreen : The formula is truly hydrating and especially suitable for thirsty skin. If you have very dry skin, first layer a classic moisturizer.
• Light to dark complexions sensitive to white marks : Ultra-light texture, fast absorption, zero chalky residueChemical filters blend into all skin tones.
• Makeup fans : The natural matte finish creates a smooth canvas that extends foundation wear.
• People with sensitive skin no sensitivity to chemical filters : no artificial fragrance, but contains natural essential oils (chamomile, Scots pine) — be cautious if you react to fragrances.
• Fans of Korean layering looking for a multifunctional SPF : Two-in-one cream + sunscreen, it replaces your last moisturizing step.

To avoid if…

• You have very oily skin prone to shine: Some users with combination-oily skin report excess sebum. Opt for a mattifying mineral SPF.
• You plan a beach day or hiking in the sun: choose a water-resistant sunscreen. This one is designed for everyday urban use.

Immediate : instant hydration sensation, serum-cream texture that glides like a dream and leaves a delicate luminous veil. Non-occlusive comfort.

After 2 weeks : the complexion appears less dull, post-exposure redness fades. Ascorbic acid and niacinamide begin to even out skin texture.

After 4 weeks : the epidermis is better equipped against UV damage. Existing pigmentation spots do not worsen, the hydrolipidic film strengthens (thanks to birch sap rich in NMF).

Long-term use : cumulative protection against photoaging, sunspots, and UV damage. Consistency makes all the difference — this product has been the best-seller in Korea for years, a sign that its formulation encourages regular use.

⚠️ Real limit : no SPF eliminates the need for reapplication nor corrects deep scars or established melasma. It is a preventive shield, not a miraculous repair treatment.

Can you really skip moisturizer with this sunscreen?

Yes, for normal to combination skin: the lotion-like formula provides a real dose of hydration and helps shorten your morning routine.. However, if you have very dry skin, layer a classic moisturizer first..

What’s the difference with Beauty of Joseon Relief Sun?

Both sunscreens are made by the same Korean lab Kolmar and share the same UV filters, but Round Lab focuses on birch sap while BOJ favors rice + probiotics.. The BOJ texture is said to be slightly lighter according to comparisons.

Does the formula contain fragrance?

No artificial fragrance added, but you may notice a subtle natural scent from essential oils of chamomile, pine, and mugwort.. Most users don’t detect any fragrance..

Is this SPF water- and sweat-resistant?

No, it’s not certified water-resistant — reserve it for daily commutes and office use.For an active day outdoors or at the pool, choose a mineral or waterproof sport SPF.

How long does a 50 ml tube last with daily use?

Applied in the morning and reapplied once during the day, the cream lasts about 6 to 8 weeks. If you only wear it in the morning on your face, expect 2 to 3 months — generous compared to standard 30 ml sizes.

Should you wait 30 minutes before going outside, like with American chemical filters?

Apply about 30 minutes before sun exposure to let the protective film form properly.Next-generation filters (Uvinul A Plus, Uvinul T 150) work immediately, but this time optimizes adhesion and even coverage.

Founded in 2017, Round Lab has established itself as one of Korea's most trusted skincare brands by sourcing natural ingredients from various regions of the peninsula: deep sea water from Ulleungdo Island, birch sap from the forests of Inje. The brand captures the essence of territories where pure water, mountain peaks, and powerful winds meet — a land endowed with natural resources of exceptional vitality.

Inje, perched in the mountains and untouched by human impact, is home to Korea's first birch forest. In spring, before the leaves emerge, the sap is harvested through a small hole in the trunk: this slightly sweet liquid is naturally rich in NMF — amino acids, lactic acid, pyrrolidone carboxylic acid, and hyaluronic acid.

Since its launch in 2020, the Birch Juice Sunscreen has won six beauty awards voted by Korean consumers: three-time winner of the Hwahae Beauty Awards in the Sunscreen category, first place at the Olive Young Beauty Awards, Unpa, and Glowpick. Over 10 million units sold worldwide, praised by Vogue, Allure, and NBC Select.

Round Lab’s philosophy? Simple, clean, and gentle formulas rooted in honesty and transparency — free from harsh chemicals and artificial fragrances. Discover the entire ROUND LAB range

Complete INCI list

Water, Dibutyl Adipate, Propanediol, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Polymethylsilsesquioxane, Ethylhexyl Triazone, Niacinamide, Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, Coco-Caprylate/Caprate, Caprylyl Methicone, Diethylhexyl Butamido Triazone, Glycerin, 1,2-Hexanediol, Butylene Glycol, Betula Platyphylla Japonica Juice (1425 ppm), Sodium Hyaluronate, Hyaluronic Acid, Glyceryl Glucoside, Dipotassium Glycyrrhizate, Allantoin, Portulaca Oleracea Extract, Artemisia Annua Extract, Pinus Sylvestris Leaf Oil, Anthemis Nobilis Flower Oil, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Sodium Stearoyl Glutamate, Polyacrylate Crosspolymer-6, Ethylhexylglycerin, Ascorbic Acid, Adenosine, Pentylene Glycol, Behenyl Alcohol, Poly C10-30 Alkyl Acrylate, Polyglyceryl-3 Methylglucose Distearate, Decyl Glucoside, Tromethamine, Xanthan Gum, T-Butyl Alcohol, Tocopherol, Carbomer

Key active ingredients in bold : the three highly stable chemical UV filters (Uvinul A Plus, Uvinul T 150, Tinosorb M) provide broad-spectrum SPF50+ PA++++ protection. Inje birch sap delivers hydration and soothing, supported by double molecular weight hyaluronic acid. Niacinamide and vitamin C (ascorbic acid) even out skin tone and enhance antioxidant effects. Adenosine smooths fine lines. Dipotassium Glycyrrhizate, Allantoin, and Portulaca Oleracea extracts calm irritations.

Free from : parabens, sulfates, drying alcohol, synthetic fragrance. Reef-safe formula according to the brand, with filters considered safer for marine ecosystems than oxybenzone and octinoxate.