NUMBUZIN Serums
NUMBUZIN Serums is the numbered serum collection from Korean brand NUMBUZIN, covering 20+ products across six numbered lines. Each number identifies a specific skin concern: No.2 Protein 43% Creamy Serum (50 ml and 80 ml) for barrier-strengthening protein, No.3 Softening Serum and Bodice Determination Serum (50 ml and 80 ml) for gentle exfoliation and smoothing, No.5 Goodbye Blemish Serum and Vitamin Concentrated Serum (30 ml and 50 ml) for blemish and tone, No.6 Deep Sleep Mask Serum (50 ml) for overnight renewal, No.7 Mild Green Relief Serum (50 ml) for soothing, and No.8 Good Sika Serum (50 ml) for cica barrier repair.
By Skinsli editorial Updated
Buying guide
NUMBUZIN Serum Buying Guide: All Six Numbered Lines Explained
NUMBUZIN organises its serum range by numbered concern: each number targets a distinct skin goal, and the number appears on the packaging so you know exactly what you are buying without decoding ingredient lists. The collection has 20+ serums across six active numbers - No.2, No.3, No.5, No.6, No.7, and No.8. Some numbers have multiple SKUs at different sizes or formula variants. This guide breaks down each number, what it does, and which skin type it fits.
No.2 Protein 43% Creamy Serum: Barrier-Strengthening Protein
The NUMBUZIN No.2 Protein 43% Creamy Serum comes in 50 ml and 80 ml sizes. The '43%' refers to the protein content - an unusually high active-ingredient concentration for a serum at this price tier. Protein-based serums in Korean beauty focus on strengthening the skin's natural protein matrix (keratin, collagen precursors, silk amino acids), improving barrier resilience and surface smoothness. The 'creamy' texture is thicker than a typical watery serum, making No.2 feel closer to a serum-cream hybrid - it can replace a lightweight moisturiser in a routine or be layered under a richer cream. The 80 ml size is the economy option; the 50 ml is the standard entry.
No.3 Softening Serum and Bodice Determination Serum
NUMBUZIN No.3 appears in two name variants in this collection: the No.3 Softening Serum (50 ml) and the No.3 Bodice Determination Serum (50 ml and 80 ml). Both carry the No.3 designation, which the brand associates with exfoliating enzyme or AHA/BHA technology for surface smoothing and skin-texture refinement. 'Softening' and 'Bodice Determination' are two translations of the same Korean product concept - making the skin firmer and smoother (determined in structure) - rather than two different formulas. The 80 ml Bodice Determination listing is the larger economy size of the same No.3 product. Apply in the evening after cleansing, before any heavier moisturiser.
No.5 Goodbye Blemish Serum and Vitamin Concentrated Serum
NUMBUZIN No.5 addresses two related skin concerns - blemishes and dull tone - with two formulas. The No.5 Goodbye Blemish Serum (50 ml) targets active blemishes, post-acne marks, and congested pores using a combination of blemish-clearing actives. The No.5 Vitamin Concentrated Serum (30 ml) pivots to brightening: a vitamin C or vitamin complex concentrate aimed at fading hyperpigmentation and improving overall skin luminosity. The 30 ml size of the Vitamin Concentrated Serum is a format standard for high-concentration vitamin serums, keeping oxidation risk low by minimising air exposure per bottle. Use the Goodbye Blemish Serum when blemishes or post-blemish marks are the primary concern; switch to the Vitamin Concentrated Serum when brightness and tone are the focus.
No.6 Deep Sleep Mask Serum 50ml: Overnight Renewal
The No.6 Deep Sleep Mask Serum (50 ml) is an overnight leave-on treatment positioned as the final skin step before sleep. Sleep masks in Korean beauty are hybrid products: a serum-density active formula in a gel or cream base applied like the last layer of a routine and left on all night. The 'Deep Sleep' name signals that the formula works during the sleep cycle - the skin's repair and renewal phase. This serum is best applied after all other serums and before any sleeping cream if you layer one. NUMBUZIN No.6 is suited to skin that needs renewal, hydration top-up, or barrier recovery overnight rather than an active exfoliation.
No.7 Mild Green Relief Serum 50ml: Soothing and Calming
The No.7 Mild Green Relief Serum (50 ml) is the calming-focused serum in the NUMBUZIN lineup. 'Mild Green' references the formula's soothing botanicals - typically green tea, centella, or similar calming extracts that reduce redness and inflammation. 'Relief' describes the function: irritated, reactive, or post-procedure skin that needs a gentle calming serum without actives that could further aggravate. No.7 is the recommended NUMBUZIN serum for skin that is sensitive, dealing with breakout inflammation, or recovering from a harsh treatment step. It works at any point in the routine where a soothing layer is needed - before or after other serums depending on texture.
No.8 Good Sika Serum 50ml: Cica and Barrier Repair
The No.8 Good Sika Serum (50 ml) is built around Centella asiatica (cica) - a Korean skincare ingredient associated with skin barrier repair, wound healing, and calming chronic inflammation. 'Sika' is a phonetic rendering of cica. Centella-based serums became a K-beauty staple for barrier-compromised, acne-prone, or sensitised skin. Unlike the No.7 Green Relief which is broadly soothing, No.8 is specifically oriented toward barrier rebuilding and skin recovery from repeated microinflammation. It suits skin that reacts to new products frequently, has recurring breakouts, or has been overexfoliated.
Matching a NUMBUZIN Serum to Your Skin Concern
Barrier strength and protein: No.2 Protein 43% Creamy Serum. Texture smoothing and exfoliation: No.3 Softening / Bodice Determination Serum. Blemishes and marks: No.5 Goodbye Blemish Serum. Brightening and vitamin C: No.5 Vitamin Concentrated Serum. Overnight renewal: No.6 Deep Sleep Mask Serum. Redness and general soothing: No.7 Mild Green Relief Serum. Cica barrier recovery: No.8 Good Sika Serum. Most routines benefit from one primary concern serum; many NUMBUZIN users pair No.3 (exfoliation in the evening) with No.8 (barrier repair after exfoliation) or No.5 Vitamin (morning) with No.7 Relief (evening). The numbered system makes it easy to identify a second serum to layer without overlap.
50ml vs 80ml: Choosing the Right Bottle Size
NUMBUZIN offers some serums in both 50 ml and 80 ml formats - specifically No.2 Protein 43% and No.3 Bodice Determination. The 50 ml is the standard entry size, lasting roughly two to three months at twice-daily application. The 80 ml is the economy size - the same formula at a larger volume and typically a lower per-ml cost. For a serum you already know works for your skin, the 80 ml is the practical buy. For a first trial of a new number, the 50 ml reduces the commitment cost. Numbers available only in 50 ml (No.5 Vitamin at 30 ml, No.6, No.7, No.8) do not have an 80 ml option in this collection.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
Is the NUMBUZIN No.2 Protein 43% Creamy Serum thick enough to replace a moisturiser?
For oily or combination skin, the No.2 Protein 43% Creamy Serum may function as both a serum and a light moisturiser in warm weather. Its 'creamy' texture is denser than a typical watery serum - closer to a serum-cream consistency. Dry or mature skin will likely still need a dedicated cream on top. The 80 ml size is economical for this use since the denser application rate means going through the product faster than a thinner serum.
What is the difference between the NUMBUZIN No.3 Softening Serum and No.3 Bodice Determination Serum?
They are the same formula - 'Softening Serum' and 'Bodice Determination Serum' are two translations of the same Korean product name for NUMBUZIN No.3. The 50 ml version appears under both names; the 80 ml is listed as 'Bodice Determination Serum 80ml.' Buying either 50 ml listing gives you the same product.
Should I choose the NUMBUZIN No.5 Goodbye Blemish Serum or the No.5 Vitamin Concentrated Serum 30ml?
Both are No.5 but address different sub-concerns. The Goodbye Blemish Serum targets active breakouts and post-blemish marks - the right pick when congestion and dark spots from acne are the main issue. The Vitamin Concentrated Serum (30 ml) focuses on overall brightness and oxidative dullness - better when the skin is clear but looks tired or uneven without active blemishes. Some users run both: Vitamin C in the morning under SPF and Goodbye Blemish in the evening.
How do I apply the NUMBUZIN No.6 Deep Sleep Mask Serum 50ml in a routine?
Apply the No.6 Deep Sleep Mask Serum as the last serum step before your sleep cream or as your final skin product if you skip a separate cream. It is designed to stay on overnight - do not rinse it off in the morning. Apply after cleansing and toning and after any treatment serums (retinol, acids). In the morning, cleanse off any residue with your regular cleanser before the day routine. At 50 ml with light application, the bottle lasts roughly two to three months.
What is the difference between NUMBUZIN No.7 Mild Green Relief Serum and No.8 Good Sika Serum for sensitive skin?
Both suit sensitive skin but from different angles. No.7 Mild Green Relief is a broad calming serum for general redness, irritation, or reactive skin - use it when skin is acutely inflamed or reacting. No.8 Good Sika is built specifically around Centella asiatica (cica) for barrier rebuilding and chronic microinflammation - the better choice when sensitisation is an ongoing, recurring issue rather than an acute flare. For one-serum routines, No.8 is the stronger long-term barrier repair choice; No.7 is more effective as an acute soothing response.
What does cica actually do in the NUMBUZIN No.8 Good Sika Serum?
Centella asiatica (cica) contains asiaticoside, madecassoside, and asiatic acid - compounds that activate wound-healing pathways in the skin. In the No.8 Good Sika Serum, cica supports barrier repair by stimulating collagen synthesis and calming inflammatory signals. This translates practically to reduced redness, faster recovery from breakouts and irritation, and a stronger moisture barrier that holds up better to daily stressors. Regular use over four to six weeks typically shows visible improvement in skin reactivity.
Can I use two NUMBUZIN serums in the same routine?
Yes. Common pairings: No.3 Softening (exfoliation, evening) + No.8 Good Sika (barrier repair after exfoliation, also evening). No.5 Vitamin Concentrated (morning, antioxidant protection under SPF) + No.7 Mild Green Relief (evening, calming). No.2 Protein 43% (heavier texture, after lighter serums) + No.5 Goodbye Blemish (lighter, before the protein serum). When stacking, apply lighter textures first. Avoid combining No.3 (exfoliating) with No.7 or No.8 (soothing) in the same step - use them on alternate evenings if your skin is sensitive to exfoliation.
Why is the NUMBUZIN No.5 Vitamin Concentrated Serum only 30ml?
Vitamin C serums at concentrated formulas (typically L-ascorbic acid or vitamin C derivatives at effective percentages) are commonly packaged in 30 ml bottles to limit oxidation. Vitamin C degrades on exposure to air, light, and heat - a smaller bottle means you use it up before significant degradation occurs. At two drops twice daily, a 30 ml bottle lasts about six to eight weeks. Store it away from sunlight and in a cool location to extend its active life.
Is the NUMBUZIN No.2 Protein 43% Creamy Serum 80ml worth buying over the 50ml?
The 80 ml offers a lower per-ml cost than the 50 ml for the same formula. If you already use No.2 daily and know it works for you, the 80 ml is the better-value buy. The 50 ml is the smarter entry if you have not used NUMBUZIN No.2 before - two to three months of use is sufficient to judge whether the protein formula suits your skin before committing to the larger bottle.
Are NUMBUZIN serums on skinsli authentic Korean products?
Yes. All NUMBUZIN serums on skinsli are sourced directly from Korean supply channels. NUMBUZIN is a Korean brand, and all numbered-line serums - No.2, No.3, No.5, No.6, No.7, No.8 - are authentic Korean-market products stocked by skinsli.