New from the makers of Cos De BAHA

Meet MaryenB: six focused Korean serums

Each MaryenB serum is built around one well-known active at a clear percentage: retinol, tranexamic acid, niacinamide, azelaic acid or vitamin C. Pick the one that matches what you want to work on.

Explore MaryenBGet notified at launch
MaryenB RNT Retinol 5000 IU/g serum, 30 mlRNTRetinol 5000 IU/gNiacinamide 1% · Tranexamic Acid 1%Evening · fine-line appearance MaryenB TNA5 Tranexamic Acid 5% serum, 30 mlTNA5Tranexamic Acid 5%Niacinamide 3% · Arbutin 2%Dark-spot appearance · uneven tone MaryenB NTZ20 Niacinamide 20% serum, 30 mlNTZ20Niacinamide 20%Zinc PCA 2% · Tranexamic Acid 2%Excess oil · visible pores MaryenB ANC10 Azelaic Acid 10% serum, 30 mlANC10Azelaic Acid 10%Niacinamide 1% · Cica 1%Visible redness · uneven texture MaryenB ANC5 Azelaic Acid 5% serum, 30 mlANC5Azelaic Acid 5%Niacinamide 1% · Cica 1%A gentler start with azelaic acid MaryenB VNC15 Vitamin C 15% serum, 30 mlVNC15Vitamin C 15%Arbutin 1% · Niacinamide 1%Morning · dull-looking skin

Find your MaryenB serum by concern

  • Uneven tone and dark-spot appearance

    TNA5: Tranexamic Acid 5% with Niacinamide 3% and Arbutin 2%. VNC15: Vitamin C 15% with Arbutin 1% and Niacinamide 1%, for the morning.

    TNA5 and VNC15 

  • Excess oil and visible pores

    NTZ20: Niacinamide 20% with Zinc PCA 2% and Tranexamic Acid 2%, for the look of oil and pores.

    NTZ20 

  • Visible redness and uneven texture

    ANC10 and ANC5: Azelaic Acid 10% or 5% with Niacinamide 1% and Cica 1%. New to azelaic acid? Start with ANC5.

    ANC10 and ANC5 

  • Fine-line appearance, at night

    RNT: Retinol 5000 IU/g with Niacinamide 1% and Tranexamic Acid 1%. Use in the evening and wear sunscreen during the day.

    RNT 
See the full MaryenB line

A quick guide to the actives

Niacinamide (vitamin B3) is a multi-tasking ingredient used in oil, pore and tone-focused formulas. Azelaic acid is used in tone and texture-focused skincare and is often paired with cica. Tranexamic acid and arbutin are common in serums for the look of dark spots. Vitamin C (ascorbic acid) is a classic antioxidant for a brighter-looking complexion. Retinol is an evening active that most people introduce slowly. MaryenB lists each active at a clear percentage, so you know what you are using.

One team, two brands

Cos De BAHA launched in 2019 as a Korean skincare brand and was introduced to US customers on Amazon. MaryenB is the newer brand from the same team, led by Sung Il Park, a co-founder of Cos De BAHA. Both brands share one idea: clear actives at clear percentages, in simple formulas.

Read more about MaryenBVisit maryenb.com

Frequently asked questions

What is MaryenB?

MaryenB is a Korean skincare brand of single-active facial serums. It is operated by ThirtyTree Inc. and comes from the team behind Cos De BAHA.

Can I buy MaryenB on this site?

Not yet. MaryenB is not for sale on cosdebaha.com right now. You can explore the line here and sign up to be notified when it launches.

How are MaryenB and Cos De BAHA related?

They are two separate Korean skincare brands led by the same founder, Sung Il Park. Cos De BAHA is operated by TwentyTwo Inc., and MaryenB is operated by ThirtyTree Inc.

Are Cos De BAHA products still available?

The Cos De BAHA catalog is currently sold out. The product pages and articles stay online as an archive and reference.

Which serums does MaryenB make?

Six serums: RNT (retinol 5000 IU/g), TNA5 (tranexamic acid 5%), NTZ20 (niacinamide 20%), ANC10 and ANC5 (azelaic acid 10% and 5%), and VNC15 (vitamin C 15%).

What kind of products are MaryenB serums?

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

The Cos De BAHA archive

Cos De BAHA is our original Korean skincare line of simple single-ingredient serums and creams. The catalog is currently sold out. We keep every product page and article online as a reference.

Browse the Cos De BAHA catalogRead the skincare journal