Numbuzin No.5 Vitamin Concentrated Serum 30ml

A Multi-Active Brightening Serum with Niacinamide, Tranexamic Acid, Alpha-Arbutin, Glutathione & Vitamin C

An intensive multi-active brightening serum designed for dark spots, post-blemish marks, uneven skin tone and dullness.

Rather than relying on one hero ingredient, Numbuzin No.5 combines several pigmentation-focused ingredients—including niacinamide, tranexamic acid, alpha-arbutin, glutathione and multiple forms of vitamin C—with panthenol, ceramide NP, beta-glucan and other supportive ingredients.

It is a comprehensive treatment option for practitioners who prefer one multi-active pigmentation serum rather than layering several separate brightening products.

Why We Chose It

We chose Numbuzin No.5 because it represents a distinctly different approach within the Glass Ritual Pigmentation Collection: multiple brightening pathways within one treatment step.

Niacinamide and tranexamic acid appear high in the ingredient list, while alpha-arbutin, glutathione and vitamin C derivatives provide additional targeted tone support.

This gives practitioners an alternative to buying a separate TXA serum, alpha-arbutin serum and vitamin C serum and attempting to layer them all together.

The formula also includes ingredients such as panthenol, ceramide NP, beta-glucan and allantoin to provide supportive hydration and comfort alongside the active-focused formulation.

Benefits

• Helps improve the appearance of dark spots and uneven skin tone
• Supports the appearance of post-blemish marks
• Helps brighten dull-looking skin
• Combines several pigmentation-focused ingredients in one serum
• Contains niacinamide + tranexamic acid
• Includes alpha-arbutin and glutathione
• Contains multiple forms of vitamin C
• Provides antioxidant support
• Includes panthenol, ceramide NP and beta-glucan for supportive skin care
• Allows a multi-active pigmentation treatment without requiring several separate serums

Who It's For

Consider this serum if you are concerned about:

• Dark spots
• Post-blemish pigmentation
• Uneven skin tone
• Dull-looking skin
• Multiple types of visible discolouration
• Building a more treatment-focused pigmentation ritual
• Simplifying several brightening actives into one serum step

Because this is already a multi-active formula, practitioners with sensitive or reactive skin should introduce it gradually rather than immediately combining it with numerous other active treatments.

How to Use

After cleansing and toning, apply 3–5 drops of serum. Spread gently over the face and pat until absorbed. Follow with moisturiser.

During the daytime, appropriate sun protection is particularly important when managing pigmentation.

Ritual Position

Cleanse → Tone → Treat with No.5 Vitamin Concentrated Serum → Moisturise

Use during the treatment stage of your Glass Ritual.

Glass Ritual Pairing

Think of Numbuzin No.5 as a multi-active treatment, not as the beginning of a stack of pigmentation serums.

Because the formula already contains niacinamide, tranexamic acid, alpha-arbutin, glutathione and vitamin C forms, you do not automatically need another serum containing each of those ingredients in the same routine.

Pair it with a cleanser, suitable toner and supportive moisturiser. If you also use exfoliating acids, retinoids or other concentrated treatments, introduce combinations gradually and observe your skin carefully.

Glass Ritual Principle: More ingredients do not automatically produce better results. A well-tolerated ritual that can be used consistently is more valuable than unnecessary active overload.

Key Ingredients

Niacinamide
Appears near the top of the ingredient list and supports a brighter, more even-looking complexion while contributing to skin-barrier support.

Tranexamic Acid
A targeted cosmetic brightening ingredient used to help improve the appearance of dark spots and uneven pigmentation.

Alpha-Arbutin
Helps address the appearance of uneven pigmentation through the melanin-production pathway.

Glutathione
An antioxidant incorporated into brightening formulations to support a more even and radiant-looking complexion.

3-O-Ethyl Ascorbic Acid, Ascorbic Acid & Ascorbyl Glucoside
Multiple forms of vitamin C providing antioxidant and brightening support.

Panthenol
Supports hydration and skin comfort.

Ceramide NP
Helps support the skin's protective barrier.

Beta-Glucan & Allantoin
Provide additional soothing and hydration support.

Full Ingredients

Vaccinium Vitis-Idaea Fruit Extract, Butylene Glycol, Niacinamide, Panthenol, Tranexamic Acid, Water, 1,2-Hexanediol, Neopentyl Glycol Dicaprate, Caprylic/Capric Triglyceride, Sorbitol, Bifida Ferment Lysate, Chondrus Crispus Extract, Butyrospermum Parkii (Shea) Butter, Saccharum Officinarum (Sugarcane) Extract, Alpha-Arbutin, Sodium Hyaluronate, Melia Azadirachta Flower Extract, Ocimum Sanctum Leaf Extract, Melia Azadirachta Leaf Extract, Curcuma Longa (Turmeric) Root Extract, Corallina Officinalis Extract, Tremella Fuciformis (Mushroom) Extract, Pentylene Glycol, Glycerin, 3-O-Ethyl Ascorbic Acid, Bisabolol, Tromethamine, Ethylhexylglycerin, Adenosine, Hydrogenated Lecithin, Allantoin, Glutathione, Ceramide NP, Beta-Glucan, Dipotassium Glycyrrhizate, Tocopherol, Ascorbic Acid, Ascorbyl Glucoside, Tocopheryl Acetate, Hydroxypropyl Cyclodextrin, Ubiquinone, Thioctic Acid, Potassium Hydroxide, Behenyl Alcohol, Carbomer, Xanthan Gum, Disodium EDTA.

Safety & Ingredient Information

For external use only. Avoid direct contact with the eyes and discontinue use if irritation occurs.

Patch testing is recommended when introducing a new active product, particularly for sensitive or reactive skin. Introduce concentrated treatments gradually and avoid unnecessary active stacking.

Ingredient lists and formulations may be updated by the manufacturer. Always check the ingredient list printed on the product packaging before use if you have known allergies or sensitivities.

Glass Ritual does not promise that a cosmetic serum will remove pigmentation. Dark spots and uneven skin tone can have different causes, and individual responses vary. Persistent, changing or unexplained pigmentation should be assessed by an appropriate healthcare professional.