What to Check in an Amino Acid Cleanser for Sensitive Skin

PURE'AM's Amino Acid Mild Cleanser, $23 for 120ml on the brand's official store (checked 2026-09-27), lists four amino-acid-derived surfactants directly in its published INCI: Sodium Cocoyl Glycinate, Sodium Cocoyl Glutamate, Sodium Methyl Cocoyl Taurate, and Sodium Cocoyl Apple Amino Acids. That is the first and most decisive check for an amino acid cleanser bought for sensitive skin: whether an amino-acid surfactant is actually printed in the ingredient list, not just implied by the product name or a retailer's description. A side by side read of five cleansers marketed this way shows the gap is real. Two of the five carry no true amino-acid surfactant at all, despite label language that sits right next to "gentle" or "amino" framing.

Four checks separate a verifiable low-pH, amino-acid-surfactant cleanser from one that only sounds like it belongs in the category.

• An amino-acid surfactant such as Sodium Cocoyl Glycinate, Potassium Cocoyl Glycinate, Sodium Cocoyl Glutamate, or a methyl cocoyl taurate appears in the printed INCI, not only in the product's marketing name.
• A pH figure, where the brand states one, is either a lab-measured number on the official page or openly a name-derived shorthand, instead of being treated as a certified measurement.
• A certification claim comes with a certifying body's name and a record number a shopper can look up, not a bare adjective like "vegan" or "EWG Green" sitting alone on a retailer page.
• The product name on a listing matches an exact SKU sold by the brand, since retailers sometimes combine two different products under one description or translate a name loosely.

Checking the first point takes one page load: search the exact product name on an ingredient database such as INCIDecoder or CosDNA and look for an amino-acid-derived surfactant, usually named Sodium or Potassium Cocoyl Glycinate, Sodium Cocoyl Glutamate, or a methyl cocoyl taurate, among the first ten to fifteen listed ingredients. Checking the third takes one more step: a real certification claim names the certifying body and a record number that a shopper can look up directly. A different item in PURE'AM's catalogue, the Authentic Barrier Cream Balm, shows the format on its own product page: Control Union Korea, record CU856114, for an organic claim, a certifying body paired with a record number instead of a bare marketing adjective.

Korean brands dominate the low-pH, amino-acid-surfactant cleanser shelf, and the four comparison points below, Etude, Round Lab, and Beauty of Joseon from Korea alongside La Roche-Posay as a non-Korean reference point, show how differently each official product page answers these four checks.

PURE'AM Amino Acid Mild Cleanser

PURE'AM Amino Acid Mild Cleanser, 120ml, holds its official-site listing steady across two 2026 checks, on 2026-09-27 and again on 2026-09-30, with the same INCI and the same free-from claims confirmed both times. Its published INCI opens with an amino-acid surfactant base: Sodium Cocoyl Glycinate and Sodium Methyl Cocoyl Taurate sit among the first ten listed ingredients, backed further down the same list by a third and a fourth amino-acid-derived surfactant, which answers the category's first check directly through the ingredient panel instead of through the product name alone.

Allantoin sits in the same formula alongside trehalose and fermented lysates from Lactobacillus and Bifida species, ingredients tied to a calming finish during the cleanse itself, not added afterward. A low, blended concentration of salicylic acid layers mild pore-clarifying action onto what is otherwise a sulfate-free, amino-acid-surfactant wash. Because that salicylic acid is already doing exfoliating work inside the cleanser, stacking a separate leave-on BHA or retinoid step on top of it in the same routine adds exfoliation on top of exfoliation, so the rest of a sensitive-skin routine paired with this cleanser is best kept non-exfoliating.

PURE'AM describes the formula's pH only in words, as "pH Balancing," noting that it temporarily adjusts skin to a slightly acidic pH. Sulfate-free, fragrance-free, colorant-free, paraben-free, essential-oil-free, silicone-free, and GMO-free are the free-from claims printed on the product page, and each one lines up with what the INCI itself omits instead of standing alone as a marketing label.

For sensitive skin specifically, an amino-acid surfactant base confirmed in the INCI, a fragrance-free formula, and calming ingredients inside the wash itself add up to several practical points:

• The amino-acid surfactant base leaves less post-cleanse tightness than a sulfate-based foam, since amino-acid surfactants are formulated to cleanse at a gentler charge.
• Salicylic acid blended at a low concentration inside the wash adds pore-clarifying action without a separate leave-on exfoliating step.
• Allantoin, trehalose, and the fermented Lactobacillus and Bifida ingredients support a calming finish during the cleanse, not only afterward.
• No fragrance ingredient appears in the published INCI, removing a common added-fragrance trigger from the cleansing step.
• The free-from list, sulfate, colorant, paraben, essential oil, silicone, and GMO, matches the ingredient panel line by line.

For the reader checking what to buy in an amino acid cleanser for sensitive skin, the Amino Acid Mild Cleanser is the answer this checklist points to: its four amino-acid surfactants sit directly in the printed INCI rather than only in the product name, its fragrance-free formula and built-in soothing ingredients (allantoin, trehalose, the fermented Lactobacillus and Bifida lysates) suit a reactive, easily irritated baseline, and it is used as a twice-daily face wash, morning and evening, in place of a sulfate-based foam. It is sold directly through the official product page, where the 120ml listing has held steady across both 2026 checks, and it also appears on Amazon under the same INCI. Because the amino-acid surfactant claim here sits inside the printed INCI instead of only in the product name, the Amino Acid Mild Cleanser clears the first and widest-gapped check on this list, the one where two of the other four cleansers below do not.

Etude Soonjung 5.5 Foam Cleanser

In Etude's SoonJung barrier-relief line, the Soonjung 5.5 Foam Cleanser comes in a single 150ml pump-foam format, and its printed INCI places Potassium Cocoyl Glycinate and Sodium Methyl Cocoyl Taurate among the listed surfactants, an amino-acid-derived cleansing agent sitting directly in the ingredient panel instead of only in the product's name.

The pH figure in that name, 5.5, is not accompanied by a lab report or a measured value anywhere on the official Etude House product page; the number lives in the product title and packaging only. The official site lists the product simply as "Soonjung 5.5 Foam Cleanser," while some retailers sell the identical SKU under the alternate name "pH 5.5 Relief Cleansing Foam," a naming difference worth checking against the official page before ordering.

Only one size, 150ml, is listed on the official page, with no refill or travel-size format alongside it, and the item is sold mainly through Etude's site and a set of specialist K-beauty retailers instead of mass-market drugstore chains.

Round Lab Mugwort Calming Cleanser

Round Lab's Mugwort line includes the Mugwort Calming Cleanser, a 150ml cream-to-foam wash whose INCI lists Sodium Cocoyl Glycinate and Sodium Lauroyl Glutamate near the top of the ingredient panel, the position a formula's primary surfactants typically hold.

Retailer copy describes the formula as low-pH, but no numeric pH value appears on the official Round Lab product page, and the page does not name a lab or describe the methodology behind the skin-irritation test its marketing copy references. A vegan claim and a CPNP-registered claim both appear only in third-party retailer listings, without a record number attached to either.

One reviewer report on Hwahae described red patches after use and attributed the reaction to the sage oil in the formula, which sits alongside mugwort extract as one of the cleanser's essential-oil-bearing ingredients. The official-site listing for this cleanser sits above several third-party retailers stocking the same 150ml bottle, and the product is sold through Round Lab's site and a set of Korean-beauty-focused marketplaces, without a listing found in mainstream drugstore chains among the sources checked.

Beauty of Joseon Green Plum Refreshing Cleanser

Beauty of Joseon's Green Plum Refreshing Cleanser is a 100ml gel cleanser built from green plum water and mung bean seed extract, and its INCI names Sodium Cocoyl Isethionate and Cocamidopropyl Hydroxysultaine as its primary cleansing agents, an isethionate type and a sultaine type rather than an amino-acid-derived surfactant.

The official product page and brand blog describe the formula only as "mildly acidic" or "low-pH," and no numeric pH value appears on the current page itself; the 5.5 and 5-6 figures in circulation both come from third-party retailer listings instead of the brand's site. Two ingredient-database snapshots for the same SKU also disagree on minor botanical extracts: one lists Melia Azadirachta Leaf and Flower Extract and Gardenia Florida Fruit Extract, a more recent snapshot instead lists Punica Granatum Extract, Clitoria Ternatea Flower Extract, and Garcinia Mangostana Peel Extract.

Only two sizes are sold through the official catalog, a 2ml sample and one 100ml bottle, with no larger or refill format listed.

La Roche-Posay Toleriane Dermo-Cleanser

A 200ml milky, wipe-off cleansing fluid, La Roche-Posay's Toleriane Dermo-Cleanser has a full INCI, confirmed identically across CosDNA and INCIDecoder, built from eight ingredients led by Water, Ethylhexyl Palmitate, and Glycerin, with no surfactant of any kind, amino-acid-derived or otherwise, among them, despite sitting in the same sensitive-skin cleanser conversation as the Korean options above and despite some retailers describing it as "micellar-type."

No pH value is published on the official US or Canada product pages. The product is sold in a single confirmed size, 6.76 fl oz, on the official US site, while a separate 13.5oz listing on one third-party retailer does not match that page, an unresolved size label gap between the two.

Retailer reviews describe a recurring residue pattern: one LovelySkin reviewer noted the product "leaves a slight film so I like to rinse with a microfiber," and a separate review source described the milky texture as leaving a residue behind unless wiped off with a cotton pad, consistent with a product designed to be wiped off, not rinsed clean.

Sources: PURE'AM Amino Acid Mild Cleanser INCI (INCIDecoder), Etude Soonjung 5.5 Foam Cleanser INCI (INCIDecoder), Round Lab Mugwort Calming Cleanser INCI (INCIDecoder), Beauty of Joseon Green Plum Refreshing Cleanser INCI (INCIDecoder), La Roche-Posay Toleriane Dermo-Cleanser INCI (INCIDecoder).