JUMISO Niacinamide 20% Serum

What is this product?

The 20 percent is real: niacinamide is the second of 35 ingredients and the label prints the figure inside the ingredient list itself. Whether 20 percent is worth seeking out is the harder question, because the published work behind niacinamide for marks and barrier was done at roughly 2 to 5 percent, and the thing that reliably scales above about 10 percent is stinging and flushing rather than benefit. It is the strongest version on the shelf, with tranexamic acid fifth and hexylresorcinol and glutathione further down, so it suits skin that already tolerates niacinamide; skin new to it, or with a compromised barrier, is better served starting lower. The retail record calls it suitable for all skin types, but offers no tolerance testing behind that, and no pH is published.

What makes it different?

Four pigment pathway actives stack here instead of one: niacinamide at 20 percent, tranexamic acid fifth, glutathione at 18 and hexylresorcinol at 33, and they act on different steps of melanin production rather than repeating each other. Three centella actives sit at 24, 26 and 27, with three hyaluronic forms at 19, 21 and 22. No fragrance entry, no drying alcohol and no exfoliating acid appears anywhere in the 35 ingredients, which matters more than usual here, since layering an acid on top of niacinamide at this strength is what tips most people into irritation. It comes in 40ml.

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.

Key ingredient

• Water
• Niacinamide
• Propanediol
• Butylene Glycol
• Tranexamic Acid
• 1,2-Hexanediol
• Hydroxyacetophenone
• Acrylates/C10-30 Alkyl Acrylate Crosspolymer
• Glycereth-25 PCA Isostearate
• Arginine
• Ethylhexylglycerin
• Gardenia Florida Fruit Extract
• Dextrin
• Trisodium Ethylenediamine Disuccinate
• Glycerin
• Zea Mays (Corn) Kernel Extract
• Dipropylene Glycol
• Glutathione
• Hyaluronic Acid
• Hydrogenated Lecithin
• Hydrolyzed Hyaluronic Acid
• Sodium Hyaluronate
• Polyglyceryl-10 Oleate
• Asiaticoside
• Hedera Helix (Ivy) Extract
• Madecassic Acid
• Asiatic Acid
• Fructan
• Glucose
• Paeonia Suffruticosa Root Extract
• Portulaca Oleracea Extract
• Allantoin
• Hexylresorcinol
• Artemisia Princeps Leaf Extract
• Rhodiola Rosea Root Extract

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

We could not place these in the list above: Glycereth-25 PCA Isostearate, Hydrogenated Lecithin, Polyglyceryl-10 Oleate

Did the ad claims hold up?

We checked 3 lines this product advertises against the ingredient list and public documents. None of them hold up on their own. They are partly right at best.

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