MaryenB is a Korean skincare brand operated by ThirtyTree Inc. and led by Sung Il Park, a co-founder of Cos De BAHA (launched in 2019). MaryenB makes a focused line of six single-active facial serums built around niacinamide, azelaic acid, vitamin C (ascorbic acid), retinol and tranexamic acid, each listed at a clear percentage. The brand site is maryenb.com. MaryenB serums are not yet for sale on cosdebaha.com; US availability is being prepared through Amazon.

The six MaryenB serums

RNT: Retinol 5000 IU/g Serum with Niacinamide & Tranexamic Acid

Retinol 5000 IU/g, Niacinamide 1%, Tranexamic Acid 1%. An evening serum made for the appearance of fine lines and uneven-looking texture. Use at night and wear sunscreen during the day. RNT on maryenb.com

TNA5: Tranexamic Acid 5% Serum with Niacinamide & Arbutin

Tranexamic Acid 5%, Niacinamide 3%, Arbutin 2%. A light, water-based serum made for the appearance of dark spots, uneven-looking tone and dull-looking skin. TNA5 on maryenb.com

NTZ20: Niacinamide 20% Serum with Zinc PCA & Tranexamic Acid

Niacinamide 20%, Zinc PCA 2%, Tranexamic Acid 2%. Made for the look of excess oil, visible pores and uneven-looking tone. NTZ20 on maryenb.com

ANC10: Azelaic Acid 10% Serum with Niacinamide & Cica

Azelaic Acid 10%, Niacinamide 1%, Centella Asiatica (Cica) 1%. Made for the appearance of uneven-looking tone, visible redness and uneven texture. ANC10 on maryenb.com

ANC5: Azelaic Acid 5% Serum with Niacinamide & Cica

Azelaic Acid 5%, Niacinamide 1%, Centella Asiatica (Cica) 1%. A lower-percentage option if you are new to azelaic acid. ANC5 on maryenb.com

VNC15: Vitamin C 15% Serum with Arbutin & Niacinamide

Ascorbic Acid 15%, Arbutin 1%, Niacinamide 1%. A morning serum made for the appearance of dull-looking, uneven-looking skin. A pure vitamin C formula can change color over time, which is expected. VNC15 on maryenb.com

How to use

Apply a few drops to clean skin, then follow with moisturizer. Use vitamin C (VNC15) in the morning and retinol (RNT) in the evening, and use sunscreen during the day. Introduce one new active at a time. If your skin is new to an active, start with a lower percentage (for example, ANC5 before ANC10).

Frequently asked questions

Who makes MaryenB?

MaryenB is operated by ThirtyTree Inc. and led by Sung Il Park, a co-founder of Cos De BAHA.

What kind of products does MaryenB make?

MaryenB makes facial serums: six single-active Korean skincare serums.

Where can I buy MaryenB?

MaryenB is not yet for sale on cosdebaha.com. US availability is being prepared through Amazon. Sign up on our homepage to be notified at launch.

Is MaryenB the same as Cos De BAHA?

No. They are two separate brands from the same team. Cos De BAHA is operated by TwentyTwo Inc., and MaryenB is operated by ThirtyTree Inc.

What actives does MaryenB use?

Niacinamide, azelaic acid, vitamin C (ascorbic acid), retinol, tranexamic acid, arbutin, zinc PCA and centella asiatica (cica), each listed at a clear percentage.

Which MaryenB serum should I start with?

It depends on what you want to work on: the look of dark spots and uneven tone (TNA5, VNC15), oil and visible pores (NTZ20), visible redness (ANC5, then ANC10), or the look of fine lines at night (RNT). Results vary from person to person.

What are MaryenB serums?

MaryenB products are cosmetics for caring for the appearance of your skin. Feel and results vary from person to person.

Is there a MaryenB website?

Yes. maryenb.com is the MaryenB brand site.

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