numbuzin, No.5 Vitamin-Niacinamide Concentrated Serum

No.5 Vitamin-Niacinamide Concentrated Serum

Name: No.5 Vitamin-Niacinamide Concentrated Serum
Brand: numbuzin
Price: 25 EUR
Availability: InStock
Rating: 3.93 (28 reviews)

Step 4: Serum

from €25

A 10% niacinamide + ascorbyl glucoside serum aimed at glow and tone evenness. K-beauty answer to The Ordinary 10% Niacinamide.

Skin types: Normal, Combination, Oily, Dull

Targets: Dull, Hyperpigmentation, Uneven Tone

Pros

Strong brightening combo
Lightweight finish
Layers well

Cons

10% niacinamide may flush sensitive skin
Slight tackiness

Where to buy

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Editorial verdict

The numbuzin No.5 Vitamin-Niacinamide Concentrated Serum is a highly regarded brightening serum, particularly effective for addressing dark spots, hyperpigmentation, and uneven skin tone. Reviewers frequently highlight its lightweight, fast-absorbing texture and its ability to improve overall skin radiance. While many users experience significant positive changes, it is not a quick fix and requires consistent use over several weeks to see noticeable results. Some reviewers also noted a slight stickiness, though this was generally considered minor. This serum is a strong contender for those looking to improve skin clarity and brightness, especially for acne prone and sensitive skin types.

Oily skin

Combination skin

Sensitive skin

Normal skin

Dark Spots

Hyperpigmentation

Uneven Skin Tone

Acne Scars

Dullness

Acne

Closed Comedones

What people love and don't

Based on ~68 reviews

Reviewers consistently praise the numbuzin No.5 Vitamin-Niacinamide Concentrated Serum for its effectiveness in fading dark spots, reducing hyperpigmentation, and brightening overall skin tone. Many highlight its lightweight texture and quick absorption, making it a suitable addition to various skincare routines.

The good

Effective for fading dark spots and hyperpigmentation

Many reviewers report a noticeable reduction in dark spots, acne marks, and hyperpigmentation with consistent use, attributing it to the serum's brightening ingredients like niacinamide and vitamin C derivatives.

"I have really stubborn post acne marks/dark spots, I'm talking like 6 month old ones and this has gotten rid of some of them!"

Brightens and evens skin tone

The serum helps to improve overall skin radiance and achieve a more even complexion, according to numerous users.

"It definitely improved the overall brightness of my skin and helped even out my skin tone."

Lightweight and absorbs quickly

Reviewers frequently mention the serum's non-greasy, watery texture that absorbs well into the skin without leaving a heavy feeling.

"This serum has a milky, slithery texture... it dribbles down the face when applied and you can really feel the absorption."

Hydrating benefits

Despite being a brightening serum, many users also noted its ability to provide hydration, leaving the skin feeling moisturized.

"This serum also keeps my skin elastic and hydrated."

Helps with acne and closed comedones

Some users experienced a reduction in active acne breakouts and an improvement in closed comedones after incorporating this serum into their routine.

"This also cleared my really bad closed comedones on my cheeks from a certain concealer i used."

The trade-offs

Can be slightly sticky

A few reviewers noted a minor sticky residue after application, though most found it to dissipate once absorbed or layered with other products.

"The only downside is that it leaves a slight tacky feeling on the skin."

Requires consistent use and patience for results

Reviewers emphasize that visible results, especially for stubborn dark spots, take time and consistent application over weeks or months. This is not an overnight solution.

"I'm a really patient person but I've got through 2 bottles!"

May not be effective for all dark spots

While many saw improvement, some users with very old or deeply set dark spots found the serum less effective, suggesting it works better on newer pigmentation.

"It did not completely fade my older, more stubborn dark spots, but it definitely helped with newer ones."

Reach for it if

Reviewers with oily, combination, sensitive, and acne prone skin concerns, particularly those with post acne marks, dark spots, and dull skin love this product.

Skip it if

No strong consensus on who should avoid this product. Some users mention a slight stickiness and a need for patience to see results, which might deter those seeking immediate changes or a completely non-tacky finish.

What to expect

Gradual fading of dark spots and post-acne marks
Brighter and more even skin tone
Improved skin texture
Some hydration and elasticity
Reduction in new acne breakouts and closed comedones

Don't expect

Immediate, drastic removal of all dark spots
A completely matte finish for all skin types
A standalone acne treatment for severe conditions

Deep facts

Texture: Milky, slithery, watery essence
Finish: Radiant, even, hydrated
Scent: No scent
Packaging: Glass bottle with a dropper.
Value: Generally considered a good value for its effectiveness and concentration of active ingredients, especially given its competitive pricing compared to similar products.
Lasts: ~12 weeks
Time to results: Hydration and initial brightening can be observed within a few weeks, significant improvement in dark spots and tone evening typically takes 4 to 8 weeks of consistent use.
Usage frequency: AM and PM daily
Routine position: After toner, before moisturizer
Repurchase signal: High, many reviewers indicate they have repurchased or plan to repurchase the product due to its efficacy.

Fragrance freeEssential oil freeAlcohol free

Layering tips

Layer with a good moisturizer to combat any potential tackiness and to enhance hydration. Can be used with other brightening products, but patch testing is recommended.

Often compared to

The Ordinary 10% Niacinamide

Full INCI list

This ingredient list was auto-compiled and may be incomplete or outdated. For allergens, pregnancy or sensitivity checks, verify on the brand's official page.

Niacinamide 10%, Water, Butylene Glycol, Ascorbyl Glucoside 2%, Glycerin, Pantothenic Acid, Sodium Hyaluronate, Galactomyces Ferment Filtrate.

How to use

Apply 2–3 drops after toner, AM or PM. Pair with SPF in the AM.

Questions people ask about No.5 Vitamin-Niacinamide Concentrated Serum

Answered from our enrichment data, not generic boilerplate.

What is No.5 Vitamin-Niacinamide Concentrated Serum and what does it do?

Is No.5 Vitamin-Niacinamide Concentrated Serum good for oily, combination, sensitive and normal skin?

Yes, it tends to suit oily, combination, sensitive and normal skin. Reviewers with oily, combination, sensitive, and acne prone skin concerns, particularly those with post acne marks, dark spots, and dull skin love this product.

Who should avoid No.5 Vitamin-Niacinamide Concentrated Serum?

How often should I use No.5 Vitamin-Niacinamide Concentrated Serum?

AM and PM daily

How long until No.5 Vitamin-Niacinamide Concentrated Serum shows results?

Hydration and initial brightening can be observed within a few weeks, significant improvement in dark spots and tone evening typically takes 4 to 8 weeks of consistent use.

What can I layer No.5 Vitamin-Niacinamide Concentrated Serum with?

Layer with a good moisturizer to combat any potential tackiness and to enhance hydration. Can be used with other brightening products, but patch testing is recommended.

Is No.5 Vitamin-Niacinamide Concentrated Serum worth the price?

Generally considered a good value for its effectiveness and concentration of active ingredients, especially given its competitive pricing compared to similar products.

Is No.5 Vitamin-Niacinamide Concentrated Serum suitable for sensitive skin?

No.5 Vitamin-Niacinamide Concentrated Serum is fragrance-free, which makes it a safer pick for reactive or barrier-impaired skin. Always patch test before using it on the full face.