medicube - AGE-R Glutathione Glow Serum 30g

medicube AGE-R Glutathione Glow Serum carries 50,000ppm glutathione — one of the highest concentrations in K-beauty — alongside niacinamide, adenosine and bifida ferment.

50,000ppm — what that means

Ppm is parts per million, so 50,000ppm works out to 5% glutathione. For an ingredient usually dosed in fractions of a percent, that’s a genuinely high concentration, and the headline reason this serum anchors the AGE-R line.

Glutathione and niacinamide together

The defining brightening pair of the moment: glutathione for radiance and antioxidant protection, niacinamide as one of the best-studied ingredients for the look of uneven tone. Together they target dullness and dark spots from two directions.

Bifida ferment for the barrier

A fermented ingredient long used in Korean and Japanese formulas to support a resilient-feeling skin barrier — useful in a serum built around actives.

Adenosine and collagen

Adenosine is among the most established Korean ingredients for the look of fine lines. On collagen, an honest note: topically it works as a surface humectant — the molecule is too large to rebuild anything deeper.

Booster-H technology

medicube’s patented delivery system, which the brand reports enhances serum efficacy up to 3X. medicube built its name on at-home devices, and this serum is designed to pair with their AGE-R tools — though it works fine without one.

Realistic timelines

Even at 5%, brightening is gradual work: expect eight to twelve weeks of daily use, with sunscreen every morning. New pigment forms as fast as old pigment fades without SPF.

How to use

After toner, apply an appropriate amount and pat gently into skin until absorbed. Follow with moisturizer, and sunscreen in the morning. Use morning and evening. If using an AGE-R device, apply the serum first as a conductive layer.

Frequently asked questions

Is 5% glutathione too strong?

Glutathione is well tolerated even at high concentrations — it’s an antioxidant, not an exfoliating acid. Patch test if your skin reacts easily.

Can I use it with vitamin C?

Yes — antioxidants layer well together. Introduce one new active at a time.

Do I need a medicube device for it to work?

No. The device may aid absorption, but the serum is a complete product on its own.

Will it fade dark spots?

It works on how they look, gradually, and sunscreen determines whether the progress holds.

30g or 50ml — which size?

Same formula. The 50ml is the better value if you already know your skin likes it.

Pairs well with

Prep with the AGE-R Glutathione Glow Toner. Browse Korean serums, niacinamide and brightening picks.