numbuzin Glutathione Vitamin Concentrated Mask

What is this product?

numbuzin No.5 Glutathione Vitamin Concentrated Mask is a box of five 27 ml sheet masks for dull, uneven tone and dark spots, with a functional filing noted but no type named. The essence leads with water, methylpropanediol and niacinamide, which the brand prints at 5 percent, and carries two vitamin C forms, glutathione, arbutin, adenosine, a cooling agent and humectants. It has no fragrance, no alcohol and no exfoliating acid; its three acid-named entries are ascorbic, polyglutamic and hyaluronic acid. The brand's four week study on 20 women prints 12 to 17 percent tone and spot changes, and its 8.14 times synergy chart does not draw to scale.

What makes it different?

A brightening sheet whose essence pairs 5 percent niacinamide with two vitamin C forms, arbutin and a cooling agent, where the same line's ampoule shares 15 of its names and lacks the coptis root extract, cooling agent and arbutin. The trade off is headline figures, 8.14 times and 98 percent purity, that describe a chart and a raw material rather than this sheet.

What is in it?

The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know about that ingredient.

This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary, except 1 with no dictionary entry, left in Korean.

Key ingredientWorth a closer look

• Water
• Methylpropanediol
• Niacinamide
• 피이지/피피지-17/6코폴리머
• Coptis Japonica Root Extract
• 1,2-Hexanediol
• Hydroxyacetophenone
• Hydroxyethyl Urea
• Isopentyldiol
• Methyl Gluceth-20
• Carbomer
• Arginine
• Allantoin
• Sodium Ascorbyl Phosphate
• Glutathione
• Hydrogenated Lecithin
• PEG-60 Hydrogenated Castor Oil
• Xanthan Gum
• Adenosine
• Ethylhexylglycerin
• Sodium Polyacrylate
• Butylene Glycol
• Centella Asiatica Extract
• Disodium EDTA
• Hydroxyethylcellulose
• Methyl Diisopropyl Propionamide
• Polyglutamic Acid
• Protease
• Ceramide NP
• Ascorbic Acid
• Arbutin
• Bisabolol
• Hyaluronic Acid

Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.

Did the ad claims hold up?

We checked 22 lines this product advertises against the ingredient list and public documents. Here is how they read: backed by evidence: 4 · likely, not proven: 1 · partly backed: 7 · overstated ad line: 5 · no source confirms it: 4 · says nothing: 1.

Claims translated from Korean, originals preserved.

Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.

How we read these lines

What else is worth seeing?

Products we read alongside this one.

• numbuzin No.5 Glutathione C Mark AmpouleAnother product in the same category
• 넘버즈인 No.2 Rose PDRN Collagen Plumping Sheet MaskAnother product in the same category