Daily serum enriched with tone-evening ingredients, glutathione and vitamin C, and antioxidants, to gently yet effectively fade dark spots and hyperpigmentation, leaving you with glowing, clear skin.
Glutathione is a well-known supplement especially in Korea, to improve dull, uneven skin tone and to fade hyperpigmentation, dark spots, and acne marks. This powerful antioxidant inhibits melanin overproduction and accumulation, which are the leading causes of hyperpigmentation. Glutathione-enriched skincare offers a gentler and more effective alternative to supplements.
Contains antioxidants and tone-evening ingredients glutathione, vitamin C, niacinamide and tranexamic acid to help gently yet effectively fade hyperpigmentation and darks spots and even out dull, uneven skin tone. Panthenol and ceramides for soothing and hydration.
Clinically proven to even out skin tone by 18.90% and reduce dark spots by 9.65% in 4 weeks. Hypoallergenic and skin irritation tests completed, making it safe to use for sensitive and acne-prone skin types.
How To Use
Cleanse your face and follow with toner.
Apply a small amount of the serum (2–3 drops) onto your face. Gently pat or press into the skin until fully absorbed.
Follow with your moisturizer and, if used in the morning, always finish with sunscreen — especially when using brightening formulas with vitamin C and tranexamic acid.
Key Benefits
Brightens & Evens Skin Tone
Glutathione helps inhibit melanin overproduction, supporting a more even and luminous complexion.
Vitamin C forms (ascorbic acid and derivatives) work as antioxidants and help reduce discoloration.
Niacinamide helps visibly smooth tone and improve clarity.
Targets Dark Spots & Hyperpigmentation
Tranexamic acid and other brightening ingredients work together to fade dark spots, acne marks, and pigmentation with consistent use.
Hydrating & Soothing Skin
Panthenol, ceramides, beta‑glucan, and allantoin help soothe skin, boost moisture, and support the skin’s barrier.
The formula also includes humectants and emollients to prevent dryness while delivering active brightening effects.
Antioxidant Protection
A blend of antioxidants like tocopherol (vitamin E), ubiquinone, and turmeric root extract helps protect against free‑radical damage and environmental stressors.
Hauttyp
All skin types: oily, dry, combination, acne-prone, and sensitive skin. Especially recommended for the following skin concerns: hyperpigmentation, dark spots, acne scars and marks, dull and tired complexion.
I love how this makes my skin look so healthy and 'bouncy'. It’s definitely helped with my overall radiance and I’ve had so many compliments on my complexion lately. It’s a very effective serum that does exactly what it says on the tin.
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Benjamin Wilde
You get so much value for money with this serum compared to luxury brands. The results are actually better and the formula feels much more sophisticated. My skin is glowing and feels so smooth to the touch now. A permanent staple for me.
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Sarah Jenkins
Not only does this brighten but it also keeps my skin feeling hydrated throughout the day. I’ve noticed my fine lines are less visible because my skin is so much more plump. It’s a brilliant all-rounder for anyone over thirty.
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Lucinda Vance
I noticed a difference in my skin's luminosity after just four days of use. It really helps to clear up that 'tired' look. The packaging is sleek and the product inside is high-performance skincare at its best. So happy I found this brand.
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George Miller
My skin tone has never been this consistent. No. 5 has balanced out the different patches of discolouration I had perfectly. It feels very light on the skin and layers well with my other moisturisers and sunscreens.
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Amelia Clarke
The fading of my old blemish marks has been the biggest highlight for me. This serum is potent but feels very gentle on the skin. It has a nice subtle scent and leaves a beautiful finish that isn't greasy at all. Highly recommend to everyone.
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Oliver Townsend
This serum has transformed my dull winter skin into something radiant. It works beautifully under makeup and doesn't pill at all which is a big win for me. It feels very soothing upon application and has definitely improved my skin's texture.
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Isla MacDonald
I am genuinely impressed with how quickly this worked on my hyperpigmentation. Within a fortnight my skin looked clearer and more luminous. It’s gentle enough for daily use and has become the most important step in my skincare regime.
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Harry Fletcher
Numbuzin really know what they are doing with their numbering system and No. 5 is a standout. The ingredients list is fantastic for anyone wanting to tackle uneven tone. It’s lightweight yet deeply hydrating and has given me a lovely natural radiance.
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Eleanor Rigby
I’ve always struggled with sallow skin but this serum has brought it back to life. It feels very refreshing and the dropper makes it easy to get just the right amount. My skin feels firmer and looks so much brighter than it did last month.
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Thomas Burke
I usually struggle with vitamin products being too harsh but this formula is so well-balanced. It provides all the brightening benefits without any stinging or redness. My skin feels protected and looks incredibly dewy every single morning.
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Alister Forbes
I bought this specifically to target some sun damage on my cheeks and it has worked wonders. The combination of niacinamide and vitamin C is a powerhouse. It feels very premium and a little goes a long way so the bottle lasts ages.
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Sophie Radcliffe
I have been using this serum for three weeks now and the difference in my skin tone is remarkable. My post-acne marks have faded significantly and I finally have that 'glass skin' glow everyone talks about. It absorbs so quickly without any stickiness which is perfect for my morning routine.
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James Sterling
I've tried many high-street vitamin C serums but this one from numbuzin is far superior. It doesn't irritate my sensitive skin at all and the glutathione really seems to brighten things up. My complexion looks much more even and rested even after a late night.
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Priya Sharma
I was recommended this by a friend and I am so glad I listened. It has a lovely silky texture and leaves my face feeling plump and nourished. I've noticed a real reduction in redness around my nose and my skin just looks healthier overall.
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Gemma Hollingsworth
The serum itself is easily a 5-star product as it has cleared up my dullness and made my skin feel incredibly soft and hydrated. I am only giving 4 stars because the outer delivery box was quite badly crushed when it arrived. Luckily the bottle inside is glass and stayed intact.
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