Isntree Onion NewPair Cleansing Foam 150 ml white tube

Supporting role for Excess Oiliness

What makes this different

It is a classic potassium-soap foaming cleanser, myristate and stearate soaps with a betaine, a glycinate and an olefin sulfonate, whipped into the dense, tight lather Korean and Japanese foam washes are loved for, wearing the Onion Newpair line's red onion base and heparin-tranexamic-vitamin C complex in a rinse-off. Against the brand's own low-pH cleansers it is the odd one out, an alkaline soap in a range sold to blemish-prone skin.

Isntree

Isntree Onion NewPair Cleansing Foam Review

Name: Isntree Onion NewPair Cleansing Foam Review
Item: Isntree Onion NewPair Cleansing Foam
Rating: 72
Author: Dermington

Rich Soap Foam in a Low-pH Brand Cleansers foam k beauty Paraben free Cruelty free

A dense, luxurious potassium-soap foam, myristate and stearate with a betaine, a glycinate and an olefin sulfonate, that cleans oily skin thoroughly and rinses squeaky, wearing the Onion Newpair line's red onion and heparin-tranexamic-vitamin C complex in a rinse-off where none of it can act. It is fragrance-free, lathers beautifully and is fairly priced; it is also an alkaline soap from a brand famous for low-pH cleansers, sold to the blemish-prone, often sensitive skin that acne guidelines steer away from soap. Fine for oily, resilient faces once a day; the wrong wash for the rest of the line's customers.

Price $18.00 150 ml / 5.07 fl oz

Shopper rating 4.5 ★★★★★ 121 reviews

On the market 2023 Made in South Korea

Best for oily combination

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Verdicts

How well it fits each concern

A hundred-odd reviews on YesStyle and pools at Korean retailers over three years give the foam a modest record, and the brand publishes no testing. The assessment rests on the well-characterised chemistry of potassium-soap foams, the documented effects of alkaline cleansing on acne-prone and compromised skin, and the disclosed list rather than on outcome data for this tube.

One verdict per concern. Open a row for the reasoning; the receipt has every source.

The scaleRecommendedGoodSupportingEarly evidenceNot for thisAvoidhow it works

Supporting rolefor Excess OilinessNothing here targets excess oiliness directly; sebum removal without stripping is the recognised companion to treating it, and this foam does that without known triggers.ReceiptGlycerin with Sorbitol, Allantoin and Panthenol: no evidence row for this concern yet · rule R8, same reading on 3,793 products · open the receipt

The case for it

Glycerin with Sorbitol, Allantoin and Panthenol has no evidence row yet for this concern — it is in the research queue.
The formula carries no trigger this concern is sensitive to, with the cautions noted.

Not from a trial rowStandard tolerabilityNo reviews read yet

Cautions: fungal-acne triggers.

What would change this: A researched evidence row for the lead active would replace this with a verdict.

Same rule for everyone. “Supporting role” is the verdict on 7,796 of 45,446 concern verdicts across the catalog; rule R8 decided 3,793 of them. Unchanged since September 25, 2026, engine 5.2.0.

Brand or formulator? Disclose a concentration or correct a fact →

The full receipt: rule, row, sources, dates →All excess oiliness products →

Supporting rolefor AcneNothing here targets acne directly; gentle cleansing that does not strip is the recognised companion to treating it, and this foam does that without known triggers.ReceiptGlycerin with Sorbitol, Allantoin and Panthenol: no evidence row for this concern yet · rule R8, same reading on 3,793 products · open the receipt

The case for it

Glycerin with Sorbitol, Allantoin and Panthenol has no evidence row yet for this concern — it is in the research queue.
The formula carries no trigger this concern is sensitive to, with the cautions noted.

Not from a trial rowStandard tolerabilityNo reviews read yet

Cautions: fungal-acne triggers.

What would change this: A researched evidence row for the lead active would replace this with a verdict.

Brand or formulator? Disclose a concentration or correct a fact →

The full receipt: rule, row, sources, dates →All acne products →How acne is treated →

Does the jobDoes what a cleanser is for: puts something back, surfactant mildness. Not measured from the label: pH match to skin.

A verdict is Dermington’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-2026.10-r231 · engine 5.2.0 · how we decide · this product’s receipt

Reader poll · Town SquareQuestion 1 of up to 3

Have you used Onion NewPair Cleansing Foam?

One tap counts. A couple of optional follow-ups come next.

No account neededOne answer each, change it any timeCounted only in anonymous totalsHow the Square counts →

Assessment

Pros & cons

What it does well 7

Dense, tight, luxurious lather from a potassium-soap base
Cleans oily skin and removes sunscreen thoroughly as a second cleanse
Fragrance-free with no onion smell
Glycerin, sorbitol, allantoin and panthenol soften the finish somewhat
A pea-sized amount lasts; a tube runs three to four months
Fair price for a Korean foam cleanser
Betaine and glycinate co-surfactants make it creamier than a plain soap

Where it falls short 6

An alkaline soap-based foam from a brand known for low-pH cleansers
Tight and drying on dry, combination and sensitive skin, especially twice daily
Poor fit for acne-prone skin on retinoids, benzoyl peroxide or acids
Onion, heparin, tranexamic acid and vitamin C rinse away and do nothing
Olefin sulfonate adds to the strip; stings eyes
Marginal for fungal-acne-prone skin

Review

The full review

Isntree is a brand that acne-prone customers found through its low-pH cleansers, the Hyaluronic Acid Low-pH Cleansing Foam and the Sensitive Balancing washes, syndet formulas at a skin-friendly pH that do not strip a barrier already under treatment. The cleanser it put in its Onion Newpair post-blemish line is not one of those. Its third ingredient is potassium myristate and its sixth potassium stearate, with stearic, myristic, palmitic, lauric, oleic and arachidic acids around them: a true fatty-acid soap, the base of the dense, meringue-like Korean and Japanese foam washes, cleaning at an alkaline pH. Coco-betaine and potassium cocoyl glycinate soften it, sodium C14-16 olefin sulfonate, a strong anionic, boosts it, and glycerin second with sorbitol, allantoin and panthenol take the edge off the tightness a soap leaves. It lathers magnificently, and it is, for most of the people who will buy it because of the name on the tube, the wrong cleanser. That is a strong claim about a pleasant product, and the rest of the review is the reasoning.

The reason is not that soap is bad but that acne-prone skin, and especially acne-prone skin on retinoids, benzoyl peroxide or acids, is the skin that alkaline cleansing serves worst: the transient rise in pH and the extraction of barrier lipids compound the dryness and irritation the treatments already cause, which is why acne guidelines specify mild, non-soap, low-pH cleansers and why the brand's own hyaluronic cleanser exists at all. A soap foam is not a scandal; it is a category with devoted fans, and those fans mostly have oily, robust skin and a taste for the squeak. The Onion Newpair customer, chosen by the line's name and its post-acne promise, is usually someone else. Oily, resilient skin in humid weather, washing once a day, will enjoy the squeaky-clean finish and come to no harm, particularly with a hydrating toner straight after; combination, dry and sensitive skin will feel tight within minutes and tighter after a week, and the hundred-odd YesStyle reviews say so in the polite way that reviews of a luxurious lather tend to, praising the foam and the clean feel and then noting the dryness, which is the review of every soap foam ever written. The onion extract, fourth in the list, the sodium heparin thirteenth and the tranexamic acid and vitamin C salt in the final three positions are rinsed away in thirty seconds and do nothing here; they are the line's uniform on a product that does not share the line's brief, and a buyer who chose the tube for them has been sold a name.

In use the foam is a pleasure of its kind. A pea of thick white cream whips into an abundant, tight lather with a little water, glides over the face, removes sunscreen and sebum thoroughly as a second cleanse and rinses to matte, squeaky skin with no scent and no onion whatsoever. As an evening wash after an oil cleanse on an oily face in August it is genuinely satisfying, and a tube lasts three to four months because so little is needed, which is the soap base's genuine economy. The eye sting the reviews mention is real and sharp, and the tightness is the honest signal to reach for a toner, or a different cleanser. Nothing about the foam is badly made; it is well made for a face this line was not built for.

The limits are the ones already stated and one more. The foam is a soap, and the brand's other cleansers are not; the actives are decoration in a wash-off; the fatty acids, glyceryl stearate and hydrogenated polydecene make it less than ideal for fungal-acne-prone skin, though a rinse-off mutes the concern; and the product is not vegan, because sodium heparin is animal-derived, which the vegetable on the label does not suggest and the brand's vegan-leaning image does not prepare a buyer for.

On price, $18 for 150 millilitres, lasting three to four months, is in line with Korean foam cleansers and fair for the quality of the lather; against the brand's own low-pH cleansers, which cost about the same and suit the line's customers better, it is the wrong purchase for anyone whose skin is not oily and resilient, and the right one only for the lather.

So the recommendation is narrow and plain. Oily, resilient skin that loves a dense soap foam, washes once a day, follows with a toner and is not using barrier-stripping actives can enjoy this and its no-nonsense clean. Dry, combination, sensitive or treated acne-prone skin, which is to say most of the Onion Newpair line's buyers, should turn the tube over, note the potassium soaps, and pick up the brand's Hyaluronic Acid Low-pH cleanser instead, which is the cleanser this line should have been given in the first place.

The science

The foam is a fatty-acid soap cleanser with secondary surfactants. Potassium myristate and potassium stearate, formed from myristic and stearic acids neutralised with potassium hydroxide, with additional stearic, myristic, palmitic, lauric, oleic and arachidic acids, form the soap base that produces the dense, stable lather characteristic of Korean and Japanese foam washes; soap solutions are alkaline, typically pH 9 to 10, and alkaline cleansing transiently raises skin surface pH, extracts intercellular lipids and increases transepidermal water loss more than syndet cleansers at pH 5 to 6 in controlled comparisons, with the effect most consequential on dry, atopic, rosacea-prone or retinoid-treated skin. Coco-betaine, an amphoteric surfactant, and potassium cocoyl glycinate, an acylated amino-acid surfactant, reduce the aggregate irritancy of the blend and improve foam creaminess; sodium C14-16 olefin sulfonate, an anionic surfactant with irritation potential comparable to sulfates, increases foam and cleansing power. Glycerin, sorbitol and butylene glycol provide humectancy during the wash; allantoin and panthenol soothe; hydroxypropyl starch phosphate, cetearyl alcohol, glyceryl stearate and sodium chloride structure the cream; hydrogenated polydecene adds slip.

The line's signature ingredients cannot act in a rinse-off. Allium cepa bulb extract, fourth, contributes quercetin and organosulfur compounds with in vitro activity and a scar-gel pedigree irrelevant to a thirty-second wash; sodium heparin, thirteenth, tranexamic acid and sodium ascorbyl phosphate, in the final positions, have leave-on evidence at doses and contact times not approached here; Houttuynia cordata, Eclipta prostrata, Melia azadirachta, Coccinia indica, Solanum melongena, Ocimum sanctum, Curcuma longa and Corallina officinalis extracts add antioxidant notes without effect in a cleanser. Preservation uses potassium benzoate and 1,2-hexanediol with citrate buffering and trisodium ethylenediamine disuccinate and disodium EDTA as chelators. The formula is fragrance-free and alcohol-free; the fatty acids, glyceryl stearate and hydrogenated polydecene are Malassezia substrates at low residual levels; sodium heparin makes it non-vegan. It is suitable in pregnancy. The brand's testing is unpublished, and no independent study exists.

The clinical view

For acne-prone skin, dermatological guidance is consistent: a mild, non-soap, low-pH cleanser, because alkaline soap cleansing raises skin pH, strips barrier lipids and compounds the irritation of retinoids, benzoyl peroxide and acids, and because over-cleansing is a common contributor to the dryness that makes patients abandon treatment. Clinicians would therefore find this foam an odd choice for a post-blemish line and would point patients with acne under treatment, sensitive skin, rosacea or atopic tendencies toward the brand's own low-pH syndet cleansers; for oily, resilient skin washing once daily and following with a moisturiser, a soap foam is tolerable and some patients prefer its finish. The onion extract, heparin and tranexamic acid would be described as marketing in a rinse-off, with no effect on marks, and the eye stinging noted as a property of soap foams generally.

Formula

Key ingredients

Potassium Myristate and Potassium Stearate (fatty-acid soaps)

Third and sixth, with stearic, myristic, palmitic, lauric and oleic acids around them: this is a true potassium soap, the classic Korean and Japanese dense-foam cleanser base, which whips into a thick, rich lather and cleans thoroughly at an alkaline pH. It is the opposite of the brand's low-pH cleansers, and the single most important fact about this foam for acne-prone skin.

Not yet assessed
Coco-Betaine with Potassium Cocoyl Glycinate and Sodium C14-16 Olefin Sulfonate

The secondary surfactants: an amphoteric betaine and an amino-acid glycinate that soften the soap, and an olefin sulfonate lower down, a strong anionic that boosts foam and cleansing; together they make the lather creamier than a plain soap but not gentler than a syndet.

Not yet assessed
Red Onion Bulb Extract (Allium Cepa)

Fourth in the list, higher than in most of the line's leave-ons, the Muan red onion that gives the range its name; in a thirty-second wash it contributes nothing beyond continuity, and the sulfur smell of a raw onion is absent.

Not yet assessed
Glycerin with Sorbitol, Allantoin and Panthenol

Glycerin second and sorbitol with two soothing agents mid-list, the humectant and calming set that keeps a soap foam from feeling as tight as a soap foam usually does; they take the edge off, and they do not change the pH.

Not yet assessed
Sodium Heparin, Tranexamic Acid and Sodium Ascorbyl Phosphate

The line's trademarked complex, with the heparin thirteenth and the tranexamic acid and vitamin C salt in the last three positions, in a rinse-off that is on the skin for half a minute; they are the reason the foam wears the Onion Newpair name and cannot act in a wash.

Not yet assessed

Full ingredient list 42 ingredients ShowHide

Water, Glycerin, Potassium Myristate, Allium Cepa (Onion) Bulb Extract, Stearic Acid, Potassium Stearate, Myristic Acid, Glyceryl Stearate, Palmitic Acid, Coco-Betaine, Potassium Cocoyl Glycinate, Hydroxypropyl Starch Phosphate, Sodium Heparin, Allantoin, Panthenol, Houttuynia Cordata Extract, Sodium C14-16 Olefin Sulfonate, Sorbitol, Potassium Benzoate, Butylene Glycol, Sodium Chloride, Cetearyl Alcohol, Coccinia Indica Fruit Extract, 1,2-Hexanediol, Eclipta Prostrata Extract, Melia Azadirachta Leaf Extract, Melia Azadirachta Flower Extract, Hydrogenated Polydecene, Arachidic Acid, Sodium Citrate, Trisodium Ethylenediamine Disuccinate, Oleic Acid, Solanum Melongena (Eggplant) Fruit Extract, Lauric Acid, Ocimum Sanctum Leaf Extract, Citric Acid, Curcuma Longa (Turmeric) Root Extract, Corallina Officinalis Extract, Sodium Ascorbyl Phosphate, Tranexamic Acid, Disodium EDTA

Safety & formulation facts

Pregnancy safe
Fragrance free
Alcohol free
Not oil free
Silicone free
Paraben free
Not sulfate free
Cruelty free
Not vegan
Not fungal-acne safe

Potential irritants potassium soap (alkaline pH)sodium C14-16 olefin sulfonate

Compatibility

Skin types & routine

oily Best for dry Not ideal combination Best for normal Works for sensitive Not ideal

Routine step cleanser

Time of day Morning & night

Best season summer

Finish matte

Layering

Squeeze a small amount into wet hands, whip it into a dense foam and massage over the face for twenty to thirty seconds, then rinse well and follow quickly with a hydrating toner to restore the skin's pH; use it once a day on oily skin, ideally in the evening after an oil cleanse, and pair it with a low-pH wash in the morning. Dry, sensitive or barrier-compromised skin should choose the brand's low-pH cleansers instead.

When to expect results

Immediate: a thick, rich lather that rinses to squeaky-clean, matte skin. Short-term (1-2 weeks): oily skin feels fresher and less greasy through the day; dry or sensitive skin feels tight. Long-term: nothing a cleanser can change; the onion, heparin and tranexamic acid rinse away, and over-cleansing with a soap can worsen a compromised barrier.

Pairs well with an oil cleanser as the first stepthe Onion Newpair Essence Toner or Clear Pad straight afteroily skin in humid weather

Don't combine with dry, sensitive or barrier-compromised skintwice-daily use on all but oily skinretinoid or acid routines that already strip

Check it against what you already use → Layering order & night-splitting →

A routine built around it

Morning

Low-pH cleanser
Toner
Moisturizer
Sunscreen

Night

Cleansing oil
Isntree Onion NewPair Cleansing Foamthis product
Onion Newpair Essence Toner
Serum
Gel cream

Guidance

How to use it, and who it's for

How to use

Wet the face, squeeze a pea-sized amount into wet palms and rub with a little water to whip up a dense foam, then massage it over the face for twenty to thirty seconds, avoiding the eyes, which it stings, and rinse thoroughly with lukewarm water. Follow immediately with a hydrating toner, the line's essence toner or clear pad, to restore the skin's surface pH, then serum and moisturiser. Use it once a day, in the evening after an oil cleanse on oily skin, and a low-pH cleanser in the morning; do not use it twice daily on combination, dry or sensitive skin, and skip it entirely on skin that is tight, flaking, red or under treatment with retinoids, benzoyl peroxide or acids, where the brand's Hyaluronic Acid Low-pH cleanser is the better choice.

Is it worth the price?

At $18 for 150 ml on the brand's global store, lasting three to four months because a pea-sized amount lathers so richly, the foam is priced in line with Korean soap-based cleansers and fairly for the quality of its lather; against the brand's own low-pH cleansers at similar prices it is the worse buy for most of the line's customers, whose skin the soap base does not suit. The money buys a luxurious foam and a fragrance-free formula, plus an onion-and-heparin story that cannot survive a rinse; for oily, resilient skin that wants the squeak, fair value, and for everyone else, the wrong tube.

Who should buy it

Oily, resilient skin, especially in humid weather, that loves a dense, squeaky soap foam, washes once a day, follows with a toner and is not using barrier-stripping actives; people who prize the rich lather of Korean and Japanese foam washes and want it fragrance-free. It suits Onion Newpair line users with genuinely oily skin who want the matching cleanser and understand it is a soap.

Who should skip it

Dry, combination, sensitive, rosacea-prone or eczema-prone skin, and acne-prone skin on retinoids, benzoyl peroxide or acids, should use a low-pH, non-soap cleanser, of which the brand sells several. Anyone expecting the onion, heparin or tranexamic acid to help marks will get a clean face and nothing more, vegans should note the heparin, and fungal-acne-prone skin should prefer an ester-and-fatty-acid-free wash.

Ready to try it?Isntree Onion NewPair Cleansing Foam · $18.00 · 150 ml / 5.07 fl oz

Buy at Amazon ♥ Or the Isntree store on Amazon →

Details

The product, in detail

Texture: A thick, white, dense cream that whips into an abundant, tight, meringue-like foam with a little water, glides over the face and rinses to a squeaky, matte, thoroughly clean finish
Scent: None; fragrance-free, with no onion smell and only the faint clean note of a soap base
Packaging: A 150 ml white squeeze tube with a flip cap
How long it lasts: About 3-4 months at a pea-sized amount once or twice a day
Once opened: Use within 12 months · track your toss-by date →
Size: 150 ml / 5.07 fl oz
Made in: South Korea
Launched: 2023
Certifications: Cruelty-free

What the first two weeks feel like

The first wash is the soap-foam experience: a small squeeze builds into a dense, tight, luxurious lather, the face rinses squeaky and matte, and oily skin feels thoroughly clean and fresh. Dry, sensitive or combination skin notices tightness within minutes and more after a week of twice-daily use, and a hydrating toner straight after is not optional. There is no scent, no onion, and no benefit from the line's actives, which rinse away.

The story behind it

Why it exists

Isntree's Onion Newpair line grew from a gel cream and ampoule for post-acne skin into a full range, and the cleansing foam was added as its wash step, formulated as a rich soap-based foam rather than in the low-pH syndet style of the brand's hyaluronic and sensitive-balancing cleansers, presumably for the dense lather Korean customers prize. It carries the line's onion extract and Sodium Heparin+3 Complex for continuity and sells beside the essence toner and clear pad.

About Isntree Established Brand (5–20 years)

Isntree, founded in South Korea in 2016, sells minimalist, well-priced formulas through Amazon, YesStyle and its own global store, and its Onion Newpair line is its post-blemish range built on Muan red onion and a heparin complex. The cleansing foam is the line's wash step, with a modest retail review pool and no published testing; unlike the brand's low-pH cleansers, it is a soap-based foam.

Brand founded 2016 · This product since 2023

Myth vs. reality

What people get wrong about it

MythA cleansing foam from a post-acne line is gentle on acne-prone skin

RealityThis foam is a potassium soap with an olefin sulfonate, which lathers richly and cleans at an alkaline pH; acne guidelines favour low-pH, non-soap cleansers because alkaline washing disturbs the barrier and can worsen irritation on treated skin. The line's leave-on products are gentle; the foam is a soap, and the brand's other cleansers are the better match for blemish-prone skin.

MythThe onion, heparin and tranexamic acid in the foam help fade marks

RealityAll three are rinsed away within thirty seconds, and tranexamic acid and the vitamin C salt sit in the last three positions of a forty-one-ingredient list; nothing in a wash-off foam fades a mark. The line's toner, pad and gel cream carry the same names as leave-ons, and those are where the effect, such as it is, lives.

FAQ

Questions people ask

Is the Isntree Onion NewPair Cleansing Foam low-pH?

No, unlike most of the brand's cleansers. Its base is potassium myristate and potassium stearate, true fatty-acid soaps, with a betaine, a glycinate and an olefin sulfonate, which gives a dense, rich lather at an alkaline pH; the brand's Hyaluronic Acid Low-pH and Sensitive Balancing cleansers are the low-pH options. Follow this foam with a hydrating toner straight away.

Is the Onion NewPair Cleansing Foam good for acne-prone skin?

It cleans oily, acne-prone skin thoroughly, which some users like, but it is a soap, and acne guidelines favour low-pH, non-soap cleansers because alkaline washing disturbs the barrier and adds irritation on skin already using retinoids or benzoyl peroxide. Oily, resilient skin can use it once a day; sensitive or treated acne-prone skin should choose one of the brand's low-pH washes.

Does the Onion NewPair Cleansing Foam fade acne marks?

No. The onion extract, sodium heparin, tranexamic acid and sodium ascorbyl phosphate it carries are rinsed off in thirty seconds, and the last three sit at the tail of a forty-one-ingredient list; no cleanser fades marks. The line's leave-on toner, pad, ampoule and gel cream are where any mark-fading happens.

Is the Onion NewPair Cleansing Foam drying?

On dry, combination or sensitive skin, yes: the soap base and olefin sulfonate leave a squeaky, tight finish that glycerin, sorbitol, allantoin and panthenol only partly soften, and twice-daily use over a week makes the tightness worse. Oily skin in humid weather tolerates it best, once a day, followed immediately by a toner.

Is the Onion NewPair Cleansing Foam fungal-acne-safe?

Not strictly. It contains stearic, myristic, palmitic, lauric, oleic and arachidic fatty acids, glyceryl stearate and hydrogenated polydecene, several of which Malassezia can use; in a rinse-off the risk is small, but the brand's Dokdo-style syndet cleansers avoid them altogether.

Is the Onion NewPair Cleansing Foam worth $18?

For 150 ml of a rich, fragrance-free soap foam that lasts three to four months, the price is in line with Korean foam cleansers, and the lather is genuinely luxurious. It is poor value for the sensitive, dry or treated acne-prone skin the line's name attracts, who would do better with the brand's cheaper low-pH cleansers.

Reviews

What shoppers tend to say

Recurring themes our editors read across retailer reviews — summaries in our words, not quotations, and not a substitute for a patch test.

Common praise

rich, dense, luxurious foam
squeaky-clean feel on oily skin
no onion smell
removes sunscreen well as a second cleanse
a little goes a long way

Common complaints

tight and drying, especially twice a day
not low-pH like the brand's other cleansers
too much for dry or sensitive skin
stings if it gets in the eyes
no visible effect on marks

Notable endorsementsSold on YesStyle and the brand's global storePart of Isntree's Onion Newpair post-blemish line

Related conditions Excess Oiliness Acne Sensitivity

Related ingredients potassium soap surfactants glycerin