What does the serum feel like, and does it leave a sticky finish?

It has a silky, slightly viscous texture that spreads and absorbs easily without leaving a sticky finish.

Is it recommended for sensitive or acne-prone skin?

Yes. It is recommended for sensitive and acne-prone skin, along with oily, dry and combination skin. Irritation testing was completed, but individual reactions can still vary.

How and when should I apply the serum?

Use it morning and evening after cleansing and toning. Apply a few drops, spread gently and pat until absorbed, then follow with moisturizer. Finish your morning routine with sunscreen.

Which highlighted ingredients and published amounts are in the formula?

Published exact-product amounts include 5% niacinamide, 5% panthenol, 4% tranexamic acid and 100 ppm glutathione. The vitamin C forms are listed as 2,000 ppm 3-O-ethyl ascorbic acid and 1 ppb each ascorbic acid and ascorbyl glucoside.

Does different-looking packaging mean the serum formula changed?

The bottle and outer box were refreshed while the serum formula remained unchanged, so packaging may vary during the transition.

Does the formula contain animal-derived ingredients?

The official product page states that the formula is made without animal-derived ingredients.

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NUMBUZIN

No.5+ Glutathione Vitamin Concentrated Serum

What it is: A daily facial serum that helps improve the look of dark spots, post-acne marks and dull, uneven tone.

Dark-spot & post-mark care
More even-looking radiance
Soothing hydration support
Silky, non-sticky finish

Net weight: 30 mL

No.5+ Glutathione Vitamin Concentrated Serum

30ml ·$17.99 USD

Dark-spot & post-mark care

More even-looking radiance

Soothing hydration support

Silky, non-sticky finish

Main active: Glutathione
Intensity: Supportive

PRODUCT DETAILS

Hello, brighter-looking days. This daily serum is made for the appearance of dark spots, post-acne marks and dull, uneven-looking tone. Its focus is skin that looks clearer, more even and radiant.

At its center is an antioxidant and tone-evening blend of glutathione, niacinamide, tranexamic acid and vitamin C. The formula includes 5% niacinamide, 4% tranexamic acid and three forms of vitamin C, while alpha-arbutin adds another tone-care ingredient.

That focused blend is paired with 5% panthenol and ceramide for soothing, hydrating support. The formula is made without animal-derived ingredients and is recommended for dry, oily, combination and sensitive skin, as well as acne-prone skin. Individual fit can still vary.

The texture brings a softer note: silky and slightly viscous, with easy spread and absorption and no sticky finish. The bottle and outer box have been refreshed while the serum formula remains unchanged, so packaging may vary during the transition.

Learn more

GOES WELL WITH

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

5α Control No-sebum Sun Lotion SPF50+ PA++++$17.99 USD

All Around Safe Block Soft Finish Sun Milk SPF50+ PA+++$11.99 USD

Alpha-5 Mela Care Cream$14.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

Focused tone care, soothing hydration and a silky finish come together in one daily serum.

Dark-spot care
More even radiance
Hydrating comfort

Key Ingredients

Fine dry pressed striations with soft amber, celadon, lavender and coral tones fade into a warm ivory matte surface.

Glutathione

A reduced tripeptide used as a cosmetic reducing agent. Small topical studies test specific concentrations and complete regimens—not every formula that lists GLUTATHIONE.

Niacinamide

Helps visibly brighten uneven tone and support the skin barrier.

An ivory abstract form with soft, flowing folds rests on a dusty rose seamless surface, casting a gentle studio shadow.

Tranexamic Acid

May gradually improve the look of uneven tone in some leave-on formulas; the evidence is formula-specific and sun protection still matters.

Seven dry amber, apricot, lavender and celadon relief rays spread diagonally across one warm-ivory matte plaster surface beside a tiny coral point.

Vitamin C

An antioxidant ingredient family that can help brighten uneven-looking tone and soften visible dullness.

Translucent ivory sculptural folds with glossy highlights and small clear droplets on a warm cream studio surface.

Alpha-Arbutin

A defined hydroquinone glucoside with emerging formula-specific evidence for more even-looking tone—not the same ingredient as Arbutin or hydroquinone.

Panthenol

Pro-vitamin B5 that helps skin hold moisture and feel softer and more comfortable.

Overlapping ivory wax-like layers on a warm blush background, representing ceramide barrier lipids.

Ceramides

Barrier-supporting lipids that help reduce moisture loss and ease visible dryness.

Real Results

9.7%Reduction in dark spots after four weeks¹
18.9%Improvement in skin-tone evenness after four weeks¹

Results published by NUMBUZIN. Individual results may vary.

1. NUMBUZIN product results

Black glass dropper bottle with a white 5+ label on a pale green background.

Concerns & Benefits

Your Concerns

1
Dark Spots Hyperpigmentation
You want to soften the visible look of dark spots and post-acne marks.
2
Uneven Skin Tone
Your complexion looks dull or uneven and you want a clearer, more radiant look.

How To Use

1Morning and evening, cleanse and tone your skin, then dispense a few drops onto your face.
2Spread the serum gently along your skin texture and pat lightly until absorbed. You can add another layer to areas that need more moisture.
3Follow with moisturizer. In the morning, finish your routine with sunscreen.

Black glass serum bottle with a dropper cap centered on a white background.

Frequently asked questions

What skin concerns is this serum designed to address?

It helps reduce the appearance of dark spots, hyperpigmentation and post-acne marks while helping dull, uneven-looking skin appear clearer, more even and radiant.

Keep learning

Customer reviews

Frequently Bought Together

Buy these products together

This itemNo.5+ Glutathione Vitamin Concentrated Serum$17.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

Total price: $52.97 USD

This itemNo.5+ Glutathione Vitamin Concentrated Serum$17.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

Total price: $52.97 USD

ROUND LAB

1025 Dokdo Sleeping Pack

A lightweight, unscented overnight gel for hydration and smoother-feeling skin.

100 ml$15.99 USD

ROUND LAB

1025 Dokdo Sun Cream

SPF 50+ PA++++ protection in a lightweight, no-white-cast lotion.

50 ml$18.99 USD

DR CEURACLE

5α Control No-sebum Sun Lotion SPF50+ PA++++

Lightweight physical sunscreen for shine control and a powdery matte finish

50ml$17.99 USD

Missha

All Around Safe Block Soft Finish Sun Milk SPF50+ PA+++

Lightweight daily SPF50+ PA+++ sun milk with a soft matte, natural tone-up finish.

70 ml$11.99 USD

TIAM

Alpha-5 Mela Care Cream

Focused care for brighter, more even-looking skin

40 ml$14.99 USD

VT COSMETICS

100 Reedle Shot Stick Pouch

A travel-size evening booster for smoother-feeling, more refined-looking skin.

2 mL × 10$8.09 USD

ROUND LAB

1025 Dokdo Cleanser

Creamy, slightly acidic foam for a comfortable cleanse

150 ml$11.99 USD

ROUND LAB

1025 Dokdo Eye Cream

Lightweight daily eye care for hydration, brightness and smoother-looking fine lines.

30 ml / 1.01 fl oz$22.99 USD

NUMBUZIN No.5 Vitamin Concentrated Serum – 30 mL

NUMBUZIN

No.5+ Glutathione Vitamin Concentrated Serum

What it is: A daily facial serum that helps improve the look of dark spots, post-acne marks and dull, uneven tone.

Dark-spot & post-mark care
More even-looking radiance
Soothing hydration support
Silky, non-sticky finish

Net weight: 30 mL

No.5+ Glutathione Vitamin Concentrated Serum

30ml ·$17.99 USD

Dark-spot & post-mark care

More even-looking radiance

Soothing hydration support

Silky, non-sticky finish

Main active: Glutathione
Intensity: Supportive

PRODUCT DETAILS

Learn more

GOES WELL WITH

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

5α Control No-sebum Sun Lotion SPF50+ PA++++$17.99 USD

All Around Safe Block Soft Finish Sun Milk SPF50+ PA+++$11.99 USD

Alpha-5 Mela Care Cream$14.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

Focused tone care, soothing hydration and a silky finish come together in one daily serum.

Dark-spot care
More even radiance
Hydrating comfort

Key Ingredients

Real Results

9.7%Reduction in dark spots after four weeks¹
18.9%Improvement in skin-tone evenness after four weeks¹

Results published by NUMBUZIN. Individual results may vary.

1. NUMBUZIN product results

Concerns & Benefits

Your Concerns

1
Dark Spots Hyperpigmentation
You want to soften the visible look of dark spots and post-acne marks.
2
Uneven Skin Tone
Your complexion looks dull or uneven and you want a clearer, more radiant look.

How To Use

1Morning and evening, cleanse and tone your skin, then dispense a few drops onto your face.
2Spread the serum gently along your skin texture and pat lightly until absorbed. You can add another layer to areas that need more moisture.
3Follow with moisturizer. In the morning, finish your routine with sunscreen.

Frequently asked questions

What skin concerns is this serum designed to address?

It helps reduce the appearance of dark spots, hyperpigmentation and post-acne marks while helping dull, uneven-looking skin appear clearer, more even and radiant.

Keep learning

Customer reviews

Frequently Bought Together

Buy these products together

This itemNo.5+ Glutathione Vitamin Concentrated Serum$17.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

Total price: $52.97 USD

This itemNo.5+ Glutathione Vitamin Concentrated Serum$17.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Sun Cream$18.99 USD

Total price: $52.97 USD

ROUND LAB

1025 Dokdo Sleeping Pack

A lightweight, unscented overnight gel for hydration and smoother-feeling skin.

100 ml$15.99 USD

ROUND LAB

1025 Dokdo Sun Cream

SPF 50+ PA++++ protection in a lightweight, no-white-cast lotion.

50 ml$18.99 USD

DR CEURACLE

5α Control No-sebum Sun Lotion SPF50+ PA++++

Lightweight physical sunscreen for shine control and a powdery matte finish

50ml$17.99 USD

Missha

All Around Safe Block Soft Finish Sun Milk SPF50+ PA+++

Lightweight daily SPF50+ PA+++ sun milk with a soft matte, natural tone-up finish.

70 ml$11.99 USD

TIAM

Alpha-5 Mela Care Cream

Focused care for brighter, more even-looking skin

40 ml$14.99 USD

VT COSMETICS

100 Reedle Shot Stick Pouch

A travel-size evening booster for smoother-feeling, more refined-looking skin.

2 mL × 10$8.09 USD

ROUND LAB

1025 Dokdo Cleanser

Creamy, slightly acidic foam for a comfortable cleanse

150 ml$11.99 USD

ROUND LAB

1025 Dokdo Eye Cream

Lightweight daily eye care for hydration, brightness and smoother-looking fine lines.

30 ml / 1.01 fl oz$22.99 USD