No. 8 Fine Cica Serum

Somewhere between the aesthetic clinic and your bathroom shelf, there's a product category that borrows from both worlds. Numbuzin calls it 'dermacosmetic,' and their No. 8 Fine Cica Serum is the best example of what that means in practice: centella asiatica refined to its four most potent triterpenes, paired with growth factor peptides that you'd normally encounter in a post-laser recovery protocol, all packaged in a silky serum you can use every morning and night.

The growth factor inclusion is what elevates this beyond the cica serum crowd. Oligopeptide-1 (EGF, Epidermal Growth Factor) and Oligopeptide-3 (FGF, Fibroblast Growth Factor) are signaling peptides that tell skin cells to ramp up renewal and collagen production. In clinical settings, growth factor serums are recommended after microneedling, laser resurfacing, and chemical peels to accelerate healing. Numbuzin's move to include them in a daily-use serum is ambitious — it positions this product not just for chronic sensitivity, but for active repair.

The centella complex here is the most comprehensive in Numbuzin's range. The No. 7 serum includes three isolated triterpenes. The No. 8 goes further with four: asiaticoside, madecassic acid, asiatic acid, and madecassoside. Each plays a specific role in the wound-healing cascade — asiaticoside and madecassoside stimulate type I collagen synthesis, madecassic acid provides potent anti-inflammatory activity, and asiatic acid enhances tensile strength in healing tissue. Together with the whole leaf extract, this is centella asiatica taken seriously.

Niacinamide at 4-5% sits in a sweet spot that balances barrier strengthening with anti-inflammatory action. This isn't the 10% you'd find in a dedicated brightening serum — it's calibrated for repair work, supporting ceramide production and moisture retention while the growth factors and centella handle the heavy lifting on cellular renewal.

The texture is where this serum clearly diverges from Numbuzin's lighter offerings. The cyclopentasiloxane and dimethicone base creates a silky, almost primer-like feel that's fundamentally different from the watery No. 6 or the gel No. 7. When you apply this, your skin immediately feels smoother and more protected — there's a tactile reassurance that a barrier has been placed over compromised skin. For post-procedure skin, this sensation isn't just pleasant; it's functional. The silicone film creates a breathable shield that protects healing skin from environmental irritants without occluding pores.

The squalane adds another layer of emollient protection, mimicking the skin's natural sebum composition. Combined with glycerin, sodium hyaluronate, beta-glucan, and trehalose, the hydration system is thorough — multiple humectants drawing in moisture, emollients smoothing the surface, and the silicone barrier locking it all in. It's a well-engineered moisture sandwich.

The formula does contain ethanol, which appears later in the ingredient list, suggesting a low concentration likely below 1%. At this level, it likely functions as a solubilizer for one of the active ingredients rather than as a stand-alone component. For the vast majority of users, including most with sensitive skin, this concentration is functionally undetectable. But for the truly ingredient-obsessed — and for marketing consistency in a product aimed at compromised skin — it's a minor blemish on an otherwise clean label.

In practice, this serum works beautifully. Applied to irritated skin, there's an immediate calming effect — the combination of centella triterpenes and the protective silicone layer provides both biochemical and physical soothing. Over several weeks of use, skin becomes noticeably more resilient. Triggers that used to cause redness — wind, certain products, post-workout flushing — produce milder responses. The barrier feels genuinely stronger, not just temporarily patched.

The primer-like quality is a genuine dual-use benefit. Under makeup, this serum creates a smooth, even base. Under sunscreen, it prevents the friction and irritation that some SPF formulations can cause on sensitive skin. It's one of those products that improves the performance of everything layered on top of it.

There's a pilling caveat, though. The silicone base can ball up when incompatible products are layered over it — particularly water-based moisturizers or sunscreens with high concentrations of mineral filters. The solution is patience: let the serum absorb fully before applying your next step, and use patting rather than rubbing motions.

At $25 for 50ml, this sits slightly above the No. 6 and No. 7, which is fair given the growth factor peptides and the more comprehensive centella complex. It's still dramatically cheaper than dedicated growth factor serums in the clinical skincare space, which can run $100-200 for similar volumes. Whether the growth factors are present at truly efficacious concentrations is an open question — they appear after squalane and sodium hyaluronate in the ingredient list — but the supporting cast of centella, niacinamide, and barrier-repair ingredients ensures this serum delivers meaningful results regardless.

The No. 8 Fine Cica Serum represents Numbuzin at its most aspirational. It's reaching beyond basic soothing into active repair territory, and while the growth factor concentrations may be modest, the overall formulation is genuinely sophisticated. For anyone dealing with chronic sensitivity, post-procedure recovery, or barrier damage that needs more than a light cica gel can provide, this serum brings clinical thinking to an everyday price point.

Formula

The hero actives that drive this product's performance.

Ingredient	Function	Evidence
Centella Asiatica Complex (Centella Asiatica Leaf Extract, Asiaticoside, Madecassic Acid, Asiatic Acid, Madecassoside)	A comprehensive four-compound centella complex that includes all major bioactive triterpenes — asiaticoside, madecassic acid, asiatic acid, and madecassoside — alongside the whole leaf extract. This provides full-spectrum wound healing, collagen stimulation, and anti-inflammatory activity. The inclusion of madecassoside specifically enhances this formula's soothing capacity beyond the No. 7's three-triterpene approach.	well-established
Oligopeptide-1 (EGF) and Oligopeptide-3 (FGF)	Epidermal Growth Factor and Fibroblast Growth Factor — two signaling peptides that promote cellular renewal and collagen synthesis. In this cica formula, they accelerate skin repair and recovery, making this serum particularly suited for post-procedure or damaged skin that needs active healing support beyond passive soothing.	promising
Niacinamide (4-5%)	At a moderate-to-strong concentration, niacinamide strengthens the skin barrier by boosting ceramide synthesis while providing anti-inflammatory and mild brightening benefits. In this repair-focused formula, it reinforces the barrier rebuilding that the centella complex initiates.	well-established
Squalane	A lightweight, non-comedogenic emollient that mimics the skin's natural lipid composition. Provides occlusive moisture protection without heaviness, helping to lock in the hydration from glycerin and hyaluronate while supporting the compromised barrier.	well-established
Panthenol	Provides deep hydration while stimulating skin repair processes. In this recovery-focused formula, panthenol works alongside the growth factors and centella complex to accelerate healing and reduce inflammation.	well-established

Full INCI List

Purified Water, Glycerin, Cetearyl Alcohol, Cyclopentasiloxane, Polymethylsilsesquioxane, Cyclohexasiloxane, 1,2-Hexanediol, Niacinamide, Propanediol, Cetyl Ethylhexanoate, Dimethicone, Sodium Stearoyl Glutamate, Centella Asiatica Leaf Extract, Asiaticoside, Madecassic Acid, Asiatic Acid, Madecassoside, Oligopeptide-1, Oligopeptide-3, Squalane, Sodium Hyaluronate, Beta-Glucan, Hydrogenated Lecithin, Tromethamine, Dipropylene Glycol, Butylene Glycol, Carbomer, Trehalose, Panthenol, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Ethanol, Caprylyl Glycol, Sodium Phosphate

Product Flags

✓ Fragrance Free✗ Alcohol Free✗ Oil Free✗ Silicone Free✓ Paraben Free✓ Sulfate Free✓ Cruelty Free✗ Vegan✗ Fungal Acne Safe

Comedogenic Ingredients

Cetyl Ethylhexanoate

Potential Irritants

Ethanol

Compatibility

Best For

sensitive normal combination

Works For

dry oily

Not Ideal For

Addresses These Conditions

sensitivity compromised skin barrier post procedure acne scarring

Routine Step

serum

Time of Day

AM & PM

Pregnancy Safe

Yes ✓

Layering Tips

Apply after toner and before moisturizer. The serum has a slightly thicker consistency due to silicones, so use it before lighter water-based products if layering multiple serums. Works particularly well when applied after irritating treatments (retinoids, AHAs) as a recovery buffer.

Results Timeline

Immediate: calming sensation, skin feels smoother from the silicone base. 1-2 weeks: visible reduction in redness and irritation, improved skin texture. 4-8 weeks: noticeably stronger barrier, reduced sensitivity to triggers, and improved recovery speed from irritating treatments.

Pairs Well With

Gentle cleanserHydrating tonerCeramide moisturizerSunscreen

Sample AM Routine

1. Gentle cleanser
2. Toner
3. Numbuzin No. 8 Fine Cica Serum
4. Moisturizer
5. Sunscreen

Sample PM Routine

1. Cleanser
2. Toner
3. Treatment (if any)
4. Numbuzin No. 8 Fine Cica Serum
5. Moisturizer

Evidence

The Science

The four centella triterpenes in this formula represent the most thoroughly studied aspect of Centella asiatica's bioactivity. Madecassoside — the fourth triterpene not present in the No. 7 formula — has been shown in research published in the Journal of Ethnopharmacology to inhibit inflammation through the down-regulation of iNOS and COX-2 expression while simultaneously promoting collagen synthesis via TGF-beta signaling. A study in Planta Medica demonstrated that madecassoside has superior anti-inflammatory activity compared to asiaticoside in certain inflammation models, making its inclusion a meaningful upgrade.

Epidermal Growth Factor (Oligopeptide-1) has been studied for wound healing since its discoverer, Stanley Cohen, received the Nobel Prize in Physiology in 1986. A clinical study published in the Journal of Dermatological Treatment (2012) demonstrated that topical EGF significantly accelerated wound healing and reduced scarring when applied to post-procedure skin. The mechanism involves binding to EGFR receptors on keratinocytes and fibroblasts, stimulating cell proliferation and migration.

Fibroblast Growth Factor (Oligopeptide-3) complements EGF by primarily targeting dermal fibroblasts to stimulate collagen and elastin production. Research in the International Journal of Molecular Sciences has shown that the combination of EGF and FGF produces synergistic effects on wound healing that exceed either growth factor alone — supporting the rationale for including both in this formula.

Beta-glucan, a polysaccharide present in this formula, has been shown in studies published in the Journal of Cosmetic Dermatology to stimulate macrophage activity and promote wound healing while providing film-forming hydration. Combined with trehalose — a disaccharide that protects proteins and cell membranes from denaturation under stress — the formula provides cellular protection during the repair process.

References

1. Anti-inflammatory effects of madecassoside on inflammatory mediators — Journal of Ethnopharmacology (2009)
2. Topical EGF for wound healing and scar prevention — Journal of Dermatological Treatment (2012)

Dermatologist Perspective

Dermatologists in clinical practice are familiar with growth factor serums as post-procedure recovery products, and this formula's combination of EGF, FGF, and a comprehensive centella complex aligns with established recovery protocols. Board-certified dermatologists note that while the growth factor concentrations in cosmetic products are typically lower than clinical-grade formulations, the supporting centella and niacinamide ingredients provide independently validated soothing and barrier-repair benefits. This serum is frequently recommended by K-beauty-aware dermatologists for patients with chronic sensitivity or those transitioning off medical treatments who need continued barrier support.

Guidance

How to Use

Apply 2-3 drops to clean, toned skin, morning and evening. Pat gently — don't rub, as this can cause pilling with the silicone base. Allow 30-60 seconds for full absorption before applying moisturizer or sunscreen. For post-procedure use, apply liberally to treated areas as directed by your dermatologist. Can be used as a soothing buffer before or after retinoid application.

Value Assessment

At $25 for 50ml, this serum is positioned at a modest premium over Numbuzin's other serums, justified by the growth factor peptides and the most comprehensive centella complex in the range. Compared to dedicated growth factor serums from clinical brands ($100-200 range), it represents extraordinary value — even if the peptide concentrations are lower. The real value proposition is the combination of soothing, repair, and protective functions in a single, fragrance-free product at an accessible price point.

Who Should Buy

Anyone with chronic sensitivity, compromised barriers, or post-procedure skin who needs more than basic cica soothing. This is ideal for those who want growth factor technology at a K-beauty price point, and for anyone who appreciates the dual-use primer quality of a silicone-based serum.

Who Should Skip

If you actively avoid silicones in your skincare, the cyclopentasiloxane and dimethicone base won't work for you. Also skip if you prefer water-based, barely-there serum textures — this has a distinctly richer, more protective feel that some find too heavy for oily skin.

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Details

Texture

Silky, lightweight serum with a smooth, almost primer-like finish from the silicone base. Glides on easily and sets to a soft, velvety feel.

Scent

Unscented — no detectable fragrance.

Packaging

Frosted glass dropper bottle with Numbuzin's signature numbered branding. Clean, clinical aesthetic reflecting the dermacosmetic positioning.

Finish

satinvelvetylightweight

What to Expect on First Use

The serum feels immediately silky and smoothing on application, creating an almost primer-like base. No irritation or tingling even on sensitized skin. The effect is one of instant comfort — skin feels protected and calm from the first use.

How Long It Lasts

6-8 weeks with twice-daily use

Period After Opening

12 months

Best Season

All Year

Certifications

Cruelty-free

Background

Number eight in Numbuzin's system represents their 'dermacosmetic' line — products that bridge the gap between everyday skincare and clinical-grade formulations. The Fine Cica Serum was designed to offer post-procedure-level repair in a daily-use format, combining the traditional Korean reverence for centella asiatica with growth factor technology typically seen in medical aesthetics products.

About Numbuzin Established Brand (5–20 years)

Numbuzin launched in 2019 under Korea's Benow Inc. The No. 8 line positions itself as dermacosmetic-grade skincare, featuring growth factors (EGF, FGF) alongside a comprehensive centella complex — ingredients typically associated with post-procedure clinical products.

Brand founded: 2019 · Product launched: 2021

Myth vs. Reality

Myth

Growth factors like EGF in skincare can cause cancer or abnormal cell growth.

Reality

Topically applied growth factor peptides like Oligopeptide-1 (EGF) work at the surface level to promote normal cell turnover and wound healing. At cosmetic concentrations, they don't penetrate deep enough to affect systemic cell growth. The concern stems from confusion with injectable growth factors used in different medical contexts.

Myth

Silicones in skincare clog pores and trap bacteria.

Reality

The silicones in this formula (cyclopentasiloxane, dimethicone, polymethylsilsesquioxane) are non-comedogenic and breathable. They create a smooth protective film that actually helps protect compromised skin without occluding pores. They're widely used in post-procedure products specifically because they're non-irritating.

FAQ

Common Praise

"Effectively soothes irritated and post-procedure skin"

"Silky smooth texture that doesn't feel heavy"

"Noticeable improvement in skin barrier resilience"

"Growth factor peptides set it apart from basic cica serums"

"Fragrance-free and gentle on sensitive skin"

Common Complaints

"Silicone-heavy formula may not suit those avoiding silicones"

"Contains ethanol which concerns some sensitive skin users"

"Pilling can occur under certain moisturizers or sunscreens"

"Higher price point than the No. 6 and No. 7 serums"

Appears In

best serum for post procedure best cica serum best serum for compromised skin barrier best serum for sensitivity

Related Conditions

sensitivity compromised skin barrier post procedure scarring

Related Ingredients

centella asiatica peptides niacinamide squalane