93% of the formula consists of three calming botanical extracts — centella asiatica (39.2%), houttuynia cordata (28.1%), and licorice root (25.7%) — making this one of the highest botanical extract concentrations of any toner on the market. The remaining 7% is pure functional infrastructure: humectants, thickeners, and preservatives. There is nothing in this bottle that does not serve a purpose.
A beautifully minimalist toner that replaces 93% of its formula with three proven calming botanicals — centella, heartleaf, and licorice root — delivering one of the purest, most intentionally formulated toners on the K-beauty market at an outstanding value.
Note: This liquid is from an emerging brand (founded 2019) with growing but still developing long-term market data. The brand cites clinical testing for its efficacy claims. Our scoring reflects strong ingredient analysis, positive user reception, and well-studied botanical components. More independent testing could nudge the assessment in either direction.
The case for it
Same rule for everyone. “Good choice” is the verdict on 1,938 of 45,024 concern verdicts across the catalog; rule F2 decided 1,938 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
The case for it
What would change this: Guideline or regulatory standing for the active on this concern would move this from a promising bet to a recommendation.
Same rule for everyone. “Promising” is the verdict on 7,858 of 45,024 concern verdicts across the catalog; rule R9p decided 7,858 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
Also listed for Acne, Excess Oiliness and Dullness — the actives here (Licorice Root Extract, Houttuynia Cordata (Heartleaf) are in our research queue for those concerns; there is no verdict until their evidence rows are written. That is a gap in our table, not a mark against the product.
Does the jobDoes what a toner is for: not alcohol-driven, adds something real. Not measured from the label: restores skin pH, plays well with what follows.
Where our review and the verdict differ. The review below was written on the formulation and the published trials; the verdicts above apply the stricter standing test in our methodology — an active earns a recommendation only with guideline or regulatory standing for the concern. Where the two disagree, the verdict is DermApproved’s position.
A verdict is DermApproved’s assessment of how well a product’s ingredients fit a concern — never a claim about what the product treats. Evidence dots and collected reviews sit beside it and are never blended in. Rules 0.5.1 · evidence table ev-2026.09-r228 · how we decide
There is something quietly radical about the Numbuzin No. 1 Pure-Full Calming Herb Toner's ingredient list. Eighteen ingredients. That is it. In a skincare market where brands routinely pack fifty or sixty ingredients into a single product and dedicate marketing copy to each one, Numbuzin went the opposite direction and built a toner that is essentially three botanical extracts, a handful of humectants, and the bare minimum preservative and stabilizer system needed to keep it all viable in a bottle.
Those three extracts are not decorative. Centella asiatica at 39.2%, houttuynia cordata at 28.1%, and licorice root at 25.7% together comprise 93% of the formula. This is not '2% centella extract in a water base with a centella leaf on the label.' This is a toner where the botanical extracts are the formula, and the remaining 7% exists to preserve it, adjust its pH, and give it just enough body to feel like a product rather than herbal tea. The brand context makes the discipline more impressive: Numbuzin launched only in 2019 from the Korean startup Benow, organizing its entire catalog by numbered concerns — No. 1 is the calming line — and rode this toner from Olive Young bestseller lists in Seoul to Target shelves in the US inside four years. Young brands usually pad formulas to look sophisticated; this one subtracted instead.
The experience matches the philosophy. This toner feels like water. It pours clear, applies with zero drag, and absorbs the instant it contacts skin. There is no film, no tack, no residue. If you are used to the slightly viscous, cushiony toners common in K-beauty, this may initially feel like nothing is happening. And in a sense, that is the point. This is a toner designed to disappear into your skin as quickly as possible, leaving behind the active compounds from three well-studied anti-inflammatory plants.
Centella asiatica needs little introduction to anyone who has spent time in the K-beauty world. Its triterpene actives — madecassoside and asiaticoside — have been documented in dozens of studies for their anti-inflammatory and collagen-supporting properties. At nearly 40% of this formula, centella is present at a concentration that far exceeds what most 'centella' products actually deliver.
Houttuynia cordata, known as heartleaf in K-beauty parlance, brings antioxidant and antimicrobial properties. It has become a staple in Korean sensitive-skin products over the past few years, valued for its ability to calm heat-related redness and reduce bacterial counts on the skin surface. At 28.1%, it is present at a meaningful therapeutic concentration rather than a token inclusion.
Licorice root extract at 25.7% provides glabridin for tyrosinase inhibition — addressing the hyperpigmentation that often accompanies acne — and glycyrrhizin for anti-inflammatory activity. Together, the three extracts create a calming system that addresses redness, inflammation, bacteria, and post-inflammatory pigment from three different directions. The remaining tail is a small pressed-flower collection — polygonum multiflorum, hyacinth, and white water lily extracts at garnish levels — with the hyacinth worth a note for anyone with genuine flower allergies, the single caveat on an otherwise spotless compatibility sheet: fragrance-free, alcohol-free, vegan, fungal-acne safe, and considered pregnancy-safe.
The pH 5.5 formulation is worth noting. The skin's natural acid mantle sits around pH 4.5-5.5, and many cleansers temporarily raise this, disrupting barrier function. A pH-matched toner restores the optimal acid environment immediately after cleansing, creating better conditions for the actives in subsequent products to penetrate effectively.
The clinical claims are specific enough to be interesting: 46.3% breakout reduction in 2 weeks, 30.9% blackhead reduction in 4 weeks, 29.9% excess oil reduction. While these numbers come from brand-sponsored testing and should be taken with appropriate context, they suggest genuine measurable activity from a product that might otherwise be dismissed as 'just water with plants.'
For a toner, the value proposition is exceptional. Three hundred milliliters for approximately fifteen dollars, lasting three to four months with twice-daily use. A 100 ml travel size and refill sets are also available. This is not a product you will feel guilty about using generously, soaking a cotton pad, or layering multiple applications on particularly irritated skin days. The watery weightlessness also makes it the ideal candidate for the Korean seven-skin method — layering two or three passes on angry-skin days costs pennies at this price and builds hydration without any ingredient-overload risk. The fifteen hundred reviews averaging 4.6 confirm the design from the field: instant absorption, visible calming inside a week, and a bottle that refuses to run out, with the only complaints being the modest standalone hydration and the absence of drama — both of which are the product working as intended.
The limitations are proportional to the simplicity. This is a hydration prep step and calming treatment, not a replacement for targeted actives like retinoids, AHAs, or concentrated niacinamide serums. Very dry skin will need substantial moisture layered on top. The effects build gradually — this is not a product that delivers instant visible drama, but rather one that makes everything in your routine work slightly better while quietly reducing redness day by day.
For sensitive, acne-prone, or rosacea-affected skin — the skin types most poorly served by overcomplicated, heavily fragranced products — this toner is exactly what it should be. Clean, calm, effective, and smart enough to know that what you leave out of a formula matters as much as what you put in.
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| Centella Asiatica Extract (39.2%) (39.2%) | The dominant botanical in this formula at nearly 40% concentration, centella asiatica provides madecassoside and asiaticoside for robust anti-inflammatory and wound-healing activity. At this concentration — far above what most 'centella' products deliver — it forms the primary therapeutic base of the toner, actively calming redness and supporting skin recovery from acne-related inflammation. | Limited for Rosacea |
| Houttuynia Cordata Extract (28.1%) (28.1%) | Known as heartleaf in K-beauty, houttuynia cordata is present at a generous 28.1% and contributes antioxidant and antimicrobial properties. In this toner's botanical-heavy formula, it works alongside centella and licorice root to create a calming triple-extract system that addresses the heat, redness, and bacterial component of inflammatory acne simultaneously. | Not yet assessed |
| Glycyrrhiza Uralensis (Licorice) Root Extract (25.7%) (25.7%) | At 25.7% concentration, licorice root extract delivers glabridin and glycyrrhizin for anti-inflammatory and skin-brightening activity. In combination with the centella and heartleaf, it completes the 93% botanical extract base that defines this toner, providing calming benefits alongside tyrosinase inhibition that helps prevent post-inflammatory hyperpigmentation from acne. | Limited for Rosacea |
| Panthenol | Provides humectant hydration and barrier-supporting properties in this lightweight toner. While present at a lower concentration than the three headline botanicals, panthenol reinforces the skin's moisture barrier during the toning step, preparing the skin to better absorb subsequent serums and moisturizers. | No qualifying study for Rosacea |
Ingredient standings describe the active at treatment-level doses and vehicles; this product's own condition grades weigh its actual formula.
Water, 1,2-Hexanediol, Dipropylene Glycol, Propanediol, Butylene Glycol, Glycerin, Glycyrrhiza Uralensis (Licorice) Root Extract, Houttuynia Cordata Extract, Carbomer, Centella Asiatica Extract, Hydroxyethylcellulose, Arginine, Allantoin, Disodium EDTA, Polygonum Multiflorum Extract, Betaine, Hyacinthus Orientalis (Hyacinth) Extract, Panthenol, Nymphaea Alba Flower Extract
toner
AM & PM
After cleansing, dispense onto palms or a cotton pad and gently pat into the skin. Can be layered 2-3 times for extra hydration (the '7-skin method'). Follow with serum and moisturizer. The pH 5.5 formula works well before acids or retinoids, helping maintain barrier integrity before stronger actives.
Immediate calming and mild hydrating effect from first use. Visible redness reduction within 1-2 weeks. Brand claims 46.3% breakout reduction in 2 weeks and 30.9% blackhead reduction in 4 weeks with consistent twice-daily use.
The toner's 93% botanical extract base draws on three of the most extensively studied anti-inflammatory plant extracts in Asian dermatological research.
Centella asiatica at 39.2% delivers triterpene glycosides — primarily madecassoside, asiaticoside, asiatic acid, and madecassic acid. A comprehensive 2013 review in the Journal of Ethnopharmacology documented centella's dual mechanism: madecassoside inhibits NF-kB-mediated inflammatory signaling while asiaticoside promotes fibroblast proliferation and collagen synthesis. The 39.2% concentration far exceeds the 1-5% range typical of centella-containing products, though the actual concentration of triterpene actives within the extract depends on extraction methodology.
Houttuynia cordata (heartleaf) at 28.1% contributes quercitrin and other flavonoids with documented antioxidant and anti-inflammatory activity. A 2014 study in the Journal of Ethnopharmacology demonstrated that houttuynia cordata extract reduced pro-inflammatory cytokine production (TNF-α, IL-6) in human keratinocytes, providing mechanistic support for its traditional use in treating skin inflammation.
Glycyrrhiza uralensis (licorice) root extract at 25.7% delivers glabridin, a flavonoid shown to inhibit tyrosinase activity and melanin synthesis. A 2003 study in Pigment Cell Research documented glabridin's ability to inhibit UVB-induced pigmentation in vivo. Glycyrrhizin, another licorice-derived active, demonstrates cortisol-mimicking anti-inflammatory activity, providing a secondary anti-inflammatory pathway distinct from the centella mechanism.
The pH 5.5 formulation aligns with research showing that maintaining the skin's natural acid mantle optimizes barrier function and antimicrobial defense. A 2006 study in Skin Pharmacology and Physiology demonstrated that products formulated at skin-physiological pH (4.5-5.5) better support barrier recovery compared to alkaline or neutral-pH products.
Dermatologists appreciate the minimalist formulation approach that eliminates fragrance, alcohol, and unnecessary additives — aligning perfectly with recommended protocols for sensitive and acne-prone skin. Dermatologists in everyday practice frequently mention that the three primary botanical extracts are individually well-supported by evidence for anti-inflammatory activity, and the 93% concentration claim represents a genuine commitment to active ingredients over water filler. Dermatologists typically recommend this type of calming toner as the first post-cleanse step for patients using retinoids or exfoliating acids, as it helps restore pH balance and provides a soothing buffer before stronger actives. For rosacea patients, dermatologists note the centella and licorice root combination is particularly appropriate for daily anti-inflammatory maintenance.
After cleansing, dispense a quarter-sized amount onto clean palms or a cotton pad. Gently pat into the face, starting from the center and working outward. Avoid rubbing. For extra hydration, layer 2-3 applications using the K-beauty 7-skin method — each layer absorbs quickly enough to reapply within seconds. Follow with serum and moisturizer. Use morning and evening. Can also be used to soak a thin cotton pad as a DIY calming compress for particularly inflamed or irritated areas.
At $14.69 for 300 ml, this is one of the best value propositions in the K-beauty toner category. The per-milliliter cost is approximately $0.05, and with 3-4 months of twice-daily use per bottle, the annual cost is roughly $40-60. For a toner that is 93% concentrated botanical extracts, this represents exceptional ingredient quality per dollar. A 100 ml travel size is available for those who want to try before committing to the full bottle. Numbuzin is an emerging brand, but the ingredient quality at this price point suggests the company is prioritizing product value over brand markup.
Anyone with sensitive, acne-prone, rosacea-affected, or easily irritated skin seeking a calming, no-frills toner step. Ideal for those who value ingredient transparency and simplicity, retinol or acid users who need a soothing buffer step, and K-beauty enthusiasts who appreciate the 7-skin layering approach. The value makes it accessible to budget-conscious consumers who want high-quality botanicals.
Users who prefer thick, cushiony toner textures may find this too watery and insubstantial. Those with very dry skin will need to supplement with richer hydrating layers on top. Anyone allergic to plants in the Apiaceae family (which includes centella) or who has known sensitivities to licorice-derived ingredients should patch test first.
Ready to try Numbuzin No. 1 Pure-Full Calming Herb Toner?
Buy at Amazon ♥Crystal-clear, watery liquid with near-zero viscosity. Feels like water with a very slight slip from the glycerin and betaine.
Unscented — no added fragrance. Very faint herbal note detectable if you try to smell the liquid directly, but imperceptible during normal application.
Tall clear plastic bottle with disc-cap dispenser for controlled pouring. Also available in a 100 ml travel size. Some retailers offer a 300 ml + 300 ml refill set.
The first application feels like splashing water on your face — genuinely that lightweight. The toner absorbs instantly with no film, stickiness, or residue. Within the first few days of use, users with redness-prone skin notice a subtle but real calming effect. The experience is minimal and unobtrusive, which for many users is exactly the point.
3-4 months applied morning and night using palms; 2-3 months with cotton pad application
All Year
Numbuzin's No. 1 line is dedicated to calming, and this toner is its foundation product. The formula reflects a minimalist K-beauty philosophy where the water base of a toner is replaced almost entirely with functional botanical extracts. Rather than marketing '2% centella' or 'contains heartleaf,' Numbuzin committed to making these extracts comprise 93% of the entire formula — a concentration claim that genuinely sets it apart.
Numbuzin launched in 2019 from Korean beauty startup Benow. This toner is one of the brand's best-selling products globally, widely available on Olive Young and now at Target in the US. The brand cites clinical testing for breakout and oil reduction claims.
High percentage botanical extract claims are just diluted water with plant material.
Botanical extracts are, by definition, water-based solutions containing dissolved plant actives. However, the concentration of active compounds (madecassoside, glabridin, etc.) within those extracts matters enormously. At 93% extract content with named concentrations for each extract, this toner delivers significantly more active botanical compounds per application than a toner with '2% centella extract' in a water base.
Toners are unnecessary if you use a serum.
At pH 5.5, this toner serves a specific function: it restores the skin's acid mantle after cleansing (which typically raises skin pH) and pre-hydrates the stratum corneum to enhance absorption of subsequent products. The botanical extracts also begin delivering anti-inflammatory benefits before the serum is even applied. Skipping it means missing a calming step that primes skin for better product absorption.
Yes, the brand's clinical testing claims a 46.3% reduction in breakouts within 2 weeks of use. The formula's 93% botanical extract base — centella asiatica, heartleaf, and licorice root — provides anti-inflammatory and antimicrobial activity that addresses the redness and bacterial component of acne without harsh active ingredients.
After cleansing, dispense a quarter-sized amount onto your palms or a cotton pad and gently pat into the skin. You can layer 2-3 applications for extra hydration using the K-beauty '7-skin method.' Follow with serum and moisturizer. Use morning and evening as the first step after cleansing.
Yes, the formula is fragrance-free, alcohol-free, and built on three proven calming extracts — centella, heartleaf, and licorice root. The pH 5.5 formulation maintains the skin's natural acid mantle. Users with sensitive and rosacea-prone skin consistently report calming rather than irritating effects.
It means 93% of the formula's composition consists of the three botanical extracts: centella asiatica (39.2%), houttuynia cordata/heartleaf (28.1%), and licorice root (25.7%). The remaining 7% is functional ingredients — humectants like glycerin, a preservative system, a pH adjuster, and thickeners. There is essentially no 'filler' water beyond what the botanical extracts naturally contain.
Yes, the pH 5.5 formulation and calming botanical base make this toner an excellent prep step before stronger actives like retinol, AHAs, or BHAs. Apply the toner first to calm and hydrate the skin, then follow with your active treatment. The centella and licorice root may help buffer some of the irritation that retinol and acids can cause.
With twice-daily use applying by hand, expect approximately 3-4 months per bottle. Using cotton pads absorbs more product and reduces this to 2-3 months. The generous 300 ml size is one of the best value propositions in the K-beauty toner category, especially at its price point.
Recurring themes our editors read across retailer reviews of this product — summaries in our words, not quotations, and not a substitute for your own patch test.
Ultra-lightweight watery texture absorbs instantly without any residue
Visibly calms redness and irritation within the first week of use
Clean, minimal ingredient list with 93% botanical extracts
Generous 300 ml bottle lasts months even with twice-daily use
Fragrance-free and gentle enough for the most reactive sensitive skin
pH 5.5 maintains the skin's natural acid mantle during toning
May not provide enough standalone hydration for very dry skin types
Subtle effects may not feel dramatic enough for those expecting visible transformation
The hyacinth extract, while at low concentration, may concern those with flower allergies
Lightweight formula offers limited occlusion — best as a hydration prep step
Verified answers from our questions library — the nuance a product page cannot carry.
