No. 2 Deep Clean Fresh Cream Cleansing Foam

Numbuzin built its entire brand identity on a radical premise for Korean skincare: what if choosing products was as simple as picking a number? The No. 2 line is dedicated to cleansing, and this Deep Clean Fresh Cream Cleansing Foam is the foaming anchor of that lineup — a product that earned its stripes in the brutally competitive aisles of Olive Young before crossing oceans to land on Western shelves.

The formulation tells an interesting story if you know what to look for. Rather than reaching for the usual SLS or SLES that powers most foam cleansers, Numbuzin built this around saponified fatty acids — myristic, stearic, lauric, and palmitic acids activated by potassium hydroxide. It's essentially a modernized soap system, which sounds old-fashioned until you realize it's one of the gentler ways to generate the thick, creamy foam that makes a cleansing experience feel satisfying. Supporting this base are three additional surfactants: sodium cocoyl isethionate (beloved in baby wash formulations for its mildness), coco-glucoside (a sugar-based cleanser), and Quillaja saponaria bark extract, a plant-derived saponin that adds both foam and a touch of botanical credibility.

The texture experience is distinctive and worth describing honestly. Out of the tube, this cleanser is a thick, slightly sticky cream that doesn't glide easily on dry skin. It's the kind of texture that makes you wonder if you grabbed the wrong product. But the moment water enters the equation, it transforms — rapidly whipping into a dense, pillowy foam that feels like shaving cream mixed with a cloud. A pea-sized amount generates enough lather for your entire face, which makes the modest 120ml tube last far longer than you'd expect.

On the skin, the foam feels substantial without feeling heavy. It clings to pores and oily areas, dissolving sebum and surface debris with noticeable efficiency. The T-zone in particular gets that squeaky-clean satisfaction that oily skin types chase. Rinsing is generally clean, though some users report needing an extra splash or two to remove all traces, especially around the hairline and jawline.

Here's where honesty matters: this cleanser does lean toward the thorough end of the cleansing spectrum. If your skin runs dry, dehydrated, or reactive, that same thorough cleansing that oily skin types love might leave you feeling tight. The glycerin and butylene glycol in the formula are there to soften the blow, but they're mid-list ingredients that can only do so much against the combined might of five surfactant systems. This is a cleanser designed for skin that produces excess oil, not skin that's struggling to hold onto the moisture it has.

The fragrance situation deserves a mention. There is added fragrance in this formula — it's the last ingredient on the INCI list, suggesting a low concentration, but it's present. The scent is clean and relatively subtle, fading quickly after rinsing, but for anyone who's committed to fragrance-free skincare, this is a disqualifier.

Performance-wise, this cleanser does what it promises with admirable consistency. Blackheads don't disappear overnight — no cleanser delivers that — but with regular use as part of a double-cleanse routine, the reduced sebum buildup translates to fewer clogged pores over time. The sweet spot is pairing it with an oil cleanser first (Numbuzin conveniently makes the No. 1 Easy Peasy Cleansing Oil for exactly this purpose), letting the foam cleanser handle whatever the oil step leaves behind.

The ingredient list, while competent, is worth putting in perspective. There are no standout actives here — no niacinamide, no centella, no ceramides. What you're getting is a well-constructed surfactant vehicle with basic hydration support. That's not necessarily a criticism; a cleanser sits on your skin for sixty seconds before washing away, so loading it with expensive actives is often more marketing theater than genuine benefit. But it does mean this product lives or dies on the quality of its cleansing experience rather than any treatment-level claims.

At around eleven dollars for 120ml, the value proposition is reasonable, particularly given how little product each use requires. You're getting a well-formulated foam cleanser at a price that won't make you wince, from a brand that's proven enough to survive the notoriously fickle Korean beauty market. It's not trying to reinvent cleansing — it's trying to do basic cleansing well, and on that front, it largely succeeds.

Formula

The Science

The core cleansing mechanism in this formula relies on saponification — the reaction between fatty acids (myristic, stearic, lauric, palmitic) and potassium hydroxide to form potassium salts of those fatty acids, which function as soap. This is one of the oldest and most well-understood cleansing chemistries, and modern formulations like this one benefit from decades of optimization in how these fatty acid ratios affect foam quality, mildness, and rinsability.

Myristic acid is the primary surfactant here, listed second after water. Research published in the International Journal of Cosmetic Science has shown that potassium myristate produces a particularly rich, creamy foam with moderate cleansing strength — more thorough than stearic acid-based systems but less harsh than lauric acid-dominant ones. The inclusion of all four fatty acids in descending concentrations suggests an intentional balancing act: myristic for foam quality, stearic for creaminess and mildness, lauric for cleansing power, and palmitic for foam stability.

Sodium cocoyl isethionate (SCI) is the synthetic surfactant backup in this system. SCI has been extensively studied for its mildness profile — a 2005 study in the Journal of the American Academy of Dermatology found it to be one of the least irritating surfactants compared to sodium lauryl sulfate, making it a preferred choice in formulations targeting skin that needs effective cleansing without barrier disruption.

Quillaja saponaria bark extract provides naturally occurring saponins — triterpene glycosides that lower surface tension and create foam. While less studied in cosmetic contexts than synthetic surfactants, Quillaja saponins have been shown in pharmaceutical research to have mild antimicrobial and anti-inflammatory properties, adding a functional benefit beyond foam generation.

Glycerin at its listed concentration serves as the primary humectant counterbalance, helping to mitigate the moisture loss that any surfactant system inevitably causes. Its role here is supportive rather than therapeutic — maintaining skin hydration during the brief contact time rather than delivering lasting moisturization.

References

1. Mild cleansing technology: the role of synthetic surfactants — Journal of the American Academy of Dermatology (2005)

Dermatologist Perspective

Dermatologists generally view fatty acid-based foam cleansers as a reasonable middle ground between harsh sulfate cleansers and ultra-gentle micellar waters. For patients with oily or combination skin who prefer the tactile satisfaction of a foaming cleanse, formulas like this one — built on saponified fatty acids with gentle co-surfactants — represent a lower-risk option than traditional soap bars or SLS-heavy foams. Board-certified dermatologists would note that the presence of fragrance makes this less suitable for patients with contact dermatitis or established fragrance sensitivity, and would likely recommend fragrance-free alternatives for anyone with a compromised skin barrier. As a second cleanser in a double-cleanse routine, this type of product can help manage excess sebum production and reduce comedonal acne when used consistently.

Guidance

Numbuzin's numbered product system was designed to simplify Korean skincare for consumers overwhelmed by the category's complexity. The No. 2 line focuses on clean, refreshed skin, and this cleansing foam was one of the brand's early releases that helped establish its reputation at Olive Young, Korea's dominant beauty retailer.

About Numbuzin Emerging Brand (2–5 years)

Numbuzin launched in 2019 under Korean startup Benow and quickly gained traction after winning top honors at the 2022 Olive Young Awards. The brand is known for its numbered product system and ingredient transparency, though it has a limited track record and no independent clinical trials on its specific formulations.

Brand founded: 2019 · Product launched: 2022

Myth vs. Reality

Myth

Foam cleansers are always stripping and bad for your skin barrier.

Reality

This formula's fatty acid surfactant base (myristic, stearic, lauric, palmitic acids saponified with potassium hydroxide) is gentler than SLS-based foams, though the rich lather may still be too much for very dry or compromised skin.

Myth

Natural surfactants like Quillaja bark extract are always gentler than synthetic ones.

Reality

Plant saponins can vary widely in their irritation potential. In this formula, the Quillaja extract plays a supporting role alongside well-characterized gentle surfactants like sodium cocoyl isethionate, so the overall system is mild — but the natural origin of one ingredient doesn't automatically make the whole product gentler.

FAQ

Common Praise

"Whipped cream-like texture that feels luxurious"

"Small amount creates abundant rich lather"

"Effectively removes excess oil and makeup residue"

"Affordable price point for a K-beauty cleanser"

Common Complaints

"Can feel drying on certain skin types"

"Contains fragrance which may irritate sensitive skin"

"Sticky texture before water activation makes initial application awkward"

"Some users report difficulty rinsing completely"

Notable Endorsements

2022 Olive Young Awards top pick

Appears In

best cleanser for oily skin best foam cleanser for blackheads best k beauty cleanser best affordable foam cleanser

Related Conditions

oiliness blackheads large pores

Related Ingredients

glycerin sodium cocoyl isethionate coco glucoside