Heartleaf (Houttuynia cordata) in Korean ODM Skincare: A 2026 Indie Founder Guide
By the ALTA MEET editorial team | K-beauty ODM consulting
If you have spent five minutes on Beauty TikTok in the last two years, you have seen the same blue-and-white bottle. Anua's Heartleaf 77% Soothing Toner is the centerpiece of a now-massive US category, and behind it sits a single Korean botanical the brand never bothered to translate: Houttuynia cordata, or in Korean, eoseongcho (어성초). Mass retail finally caught up in 2024 and 2025, and Olive Young, Amazon, Sephora's K-beauty wall, and the TikTok Shop search bar all treat heartleaf as a household ingredient now.
For an indie founder evaluating a "soothing toner" launch with a Korean ODM in 2026, that retail context is both an opening and a trap. The opening: search demand for heartleaf toner, heartleaf ampoule, and heartleaf cream is no longer educational. Consumers already know what they want. The trap: every ODM line card now has a heartleaf base, almost all of them resemble each other, and a 77 percent claim by itself is no longer differentiating. Founders who win in this category in 2026 are doing it on extract spec, fermentation, and pairing with second and third actives, not on raw percentage.
This guide is the brief we give founders before they enter a heartleaf development cycle. It covers what the molecule actually does, what the Korean supply chain looks like, how Korean ODMs price the extract at indie volumes, what concentration ranges are realistic versus marketing theater, and where the formulation pitfalls hide. Every claim has a citation. Where Korean industry practice diverges from what a US retailer will assume, we flag it.
Why Heartleaf, Why Now
Heartleaf is not a new ingredient. Houttuynia cordata has been used in traditional East Asian medicine for centuries, and in Korea the dried leaf has long been brewed as eoseongcho cha for general anti-inflammatory and detoxification claims (Wikipedia: Houttuynia cordata). What is new is the speed at which one US-facing K-beauty brand turned a regional folk ingredient into a Sephora shelf staple.
Anua is the obvious driver. Anua's own brand page lists Heartleaf 77 Soothing Toner as the bestseller on Amazon's facial toner category, with a 4.7 out of 5 rating across more than 450 reviews on their site, plus prior Olive Young and Lalavla rankings (Anua product page). Beauty Independent's 2026 skincare trend roundup names heartleaf explicitly as a continuing winner for sensitive and reactive skin (Beauty Independent), and Cosmetics & Toiletries' 2025 K-beauty review credited Anua-style heartleaf and PDRN serums with a meaningful share of the year's TikTok Shop growth (Cosmetics & Toiletries).
For an indie founder, this means the "what is heartleaf" educational layer has already been done by Anua's marketing budget. You do not need to teach the ingredient. You need to differentiate within it, the way niacinamide brands had to differentiate within niacinamide after The Ordinary 10% became a category default.
A useful internal benchmark: our Korean Manufacturing Cost guide treats single-active hero ingredients as a 2-of-3 category. A heartleaf product cannot only carry heartleaf in 2026. It needs at least one supporting active and ideally one delivery angle (fermentation, encapsulation, or pad format) before the same retailer who put Anua on the shelf will entertain a second SKU.
The Molecule: What Houttuynia cordata Actually Contains
The active fraction in Houttuynia cordata is dominated by polyphenolic flavonoids. The most cited compounds across cosmetic and pharmacology literature are:
Quercetin and its glycoside quercitrin
Hyperoside
Rutin
Afzelin
Apigenin
These compounds are documented in published reviews of Houttuynia cordata's phytochemistry, including a 2024 review in Journal of Ethnopharmacology (ScienceDirect: Houttuynia cordata review), and they are the basis for the extract's anti-inflammatory, antioxidant, and antimicrobial claims commonly seen on K-beauty labels.
A useful clinical anchor for indie founders comes from a 2024 study published on PMC that examined a Houttuynia cordata fermentation broth produced via Clavispora lusitaniae fermentation. The fermented form (HCT-f) had a higher concentration of active substances and stronger free-radical scavenging than the unfermented broth, with IC50 values reported at 11.85% for one assay and 9.01% for another. Most relevant to a formulator: in lipopolysaccharide-stimulated keratinocyte models, the fermented broth reduced inflammatory and apoptotic factor secretion and contributed to skin barrier repair markers (PMC11120194). This is the literature now being quoted in 2026 Korean ODM pitch decks for fermented heartleaf upgrades.
A separate 2025 Scientific Reports paper examined the essential-oil fraction (distinct from the water and ethanol extracts most US brands use) and found it stable in oil-in-water emulsion systems with documented bioactivity, though it noted the essential oil's well-known "fishy" volatile compound profile is a sensory problem at higher inclusion rates (Nature Scientific Reports).
For a 2026 indie founder, the implication is concrete: the polyphenolic water and ethanol extracts (which are what 77 percent and 80 percent claim products actually contain) are well-documented and stable. The essential oil fraction is interesting but has a sensory ceiling. Fermented broths sit between the two and have the most current scientific momentum.
What "77 Percent Heartleaf" Actually Means
Here is the first place new founders get burned. The "77 percent" on the Anua bottle is not 77 percent of the active flavonoid fraction. It is 77 percent of a Houttuynia cordata extract solution, which itself is a dilute aqueous (water-based) extract of the herb. The Heartleaf 77% Soothing Toner's full INCI begins with Houttuynia Cordata Extract at the top, followed by purified water, 1,2-hexanediol, glycerin, betaine, panthenol, sugarcane extract, portulaca oleracea extract, butylene glycol, and other supporting ingredients (Incidecoder: Anua 77 toner full INCI).
In ingredient databases that survey thousands of products, INCIBeauty pegs Houttuynia cordata extract average use level at 0.2 percent across all cosmetic categories, with face moisturizing serums averaging 0.85 percent and sheet masks averaging around 2 percent. The outliers, which include the toners and ampoules sold by heartleaf-led brands, can run 70 to 71.2 percent and higher of extract solution (INCIBeauty: Houttuynia cordata extract).
What this means in practice: a 77 percent extract solution is, in effect, the brand replacing what would normally be "aqua" or "purified water" at the top of the INCI with a heartleaf decoction. It is a real choice (you are skipping the most common solvent), but it is not the same as 77 percent quercetin or 77 percent flavonoid actives. Once a founder accepts this, the formulation math becomes much more honest.
A practical ODM brief in 2026 should specify three numbers, not one:
Extract solution percentage (the marketing number, typically 70-80 percent for hero toners, 30-50 percent for hero creams)
Solid content of the extract, expressed as percent solids in the extract input (a 1:100 herb-to-water extract is a different ingredient than a 1:10 extract at the same inclusion rate)
Quercetin or total flavonoid spec, expressed in mg per 100 g of final formula, validated by HPLC on each lot
If a Korean ODM cannot quote you all three, you are buying a marketing percentage, not a formulation.
Korean Supply Chain: Where Heartleaf Actually Comes From
Houttuynia cordata grows wild in the warm, humid regions of southern Korea, Jeju Island, and Ulleung Island (Wikipedia: Houttuynia cordata), as well as in Japan, southern China, and parts of Southeast Asia. For cosmetic-grade material destined for ODMs in Korea, the practical supply chain has two parallel tracks:
The first track is domestic Korean-grown heartleaf, generally harvested in Jeollanam-do, Jeju, and the southern coastal provinces between late spring and early summer. This is the supply Anua references when it says its heartleaf is grown and harvested in Korea (Anua heartleaf collection). For an indie brand pursuing a "Korean-grown" or "Korean-sourced" claim on US shelves, this is the supply you want, and your ODM should be able to document the harvest region on a Certificate of Analysis.
The second track is Chinese-grown Houttuynia (often labeled yuxingcao on the Chinese side), processed into extract in Korea. This is significantly cheaper, perfectly legal in cosmetic use in Korea, the US, and the EU, and chemically indistinguishable to the consumer's skin. The differentiation lives entirely in the country-of-origin claim on your label and in the conversation your founder has with a Sephora buyer.
In ALTA MEET's 2026 ODM consulting practice, the cost delta between Korean-grown extract solution and Chinese-grown extract solution typically lands in the range of 1.6x to 2.2x at indie order volumes. Pricing varies by supplier and harvest year. The decision usually hinges not on cost but on label strategy. A Korean-grown story matters disproportionately to indie K-beauty buyers; mass-market buyers care less.
Indie Pricing Reality: What Heartleaf Costs at Indie Volumes
Here is the practical cost math we walk founders through during an ODM brief. These benchmarks reflect ALTA MEET's 2026 quoting practice across heartleaf-led toner, ampoule, and cream briefs at 3,000 to 10,000 unit MOQs. Treat them as a 2026 indie-volume reference, not a universal industry quote.
Raw extract input pricing (Korean ODM 2026 indie volumes):
Extract typeTypical price band per kgTypical concentration in finished formulaStandard Korean-grown Houttuynia cordata extract solution$14 to $28 per kg30 to 80 percent of finished formulaStandard Chinese-grown Houttuynia cordata extract solution$8 to $16 per kgSame rangeFermented Houttuynia broth (Korean)$28 to $55 per kg5 to 30 percent of finished formulaHouttuynia cordata essential oil$180 to $420 per kg0.05 to 0.5 percent of finished formula
For a hero toner SKU at 250 mL fill, 70 percent Korean-grown heartleaf extract solution, the extract alone typically contributes between $0.24 and $0.52 to per-unit COGS, depending on supplier and order tier. That is a meaningful but not dominant share of the finished cost. Packaging, fill, labeling, and the ODM's R&D and mark-up usually outweigh the extract input on toner SKUs.
For a fermented heartleaf ampoule at 30 mL fill, 25 percent fermented broth, the extract contributes roughly $0.07 to $0.18 per unit. The premium positioning of fermented heartleaf is therefore much more about pitch deck and clinical-data story than about input-cost increase. A founder who pays $32 per kg for a fermented broth and dilutes to 25 percent is buying a $0.13 ingredient with a $4 retail story attached. That is the trade.
A useful cross-reference: our Korean ODM Quote Line-by-Line guide walks through the exact line items where an indie founder should expect the ODM to break out extract cost separately from base, packaging, and labor.
Formulation Considerations: pH, Stability, Preservation
Houttuynia cordata extract is generally formulation-friendly but has some real constraints. Five points worth flagging before you sign a development agreement with an ODM:
1. Mildly acidic pH window works best. Skin barrier function favors a pH range of 5.0 to 6.0, and toners using high heartleaf concentrations typically formulate within that window (MDPI Cosmetics 2023: Houttuynia toner stability). Most Korean ODM heartleaf-led toner bases target pH 5.0 to 5.5. The Anua 77 toner is positioned at pH 5.5 (Anua Heartleaf 77 pH 5.5 Soothing Cream). Founders who insist on a pH 4.0 or below window (often because they want to add a low-pH AHA in the same product) should expect heartleaf flavonoid stability and color profile to shift, and they should request accelerated stability data specifically at the lower pH.
2. Color drift is real on long shelf life. Heartleaf-rich aqueous formulas can develop a pale yellow-to-amber tint over 24 to 36 months of shelf life, particularly at warmer storage. Korean ODMs handle this in three ways: tinted secondary packaging (the Anua opaque white bottle is partly a UV protection choice), inclusion of a stabilizing chelator like disodium EDTA, or accepting and disclosing the color shift in stability documentation.
3. Preservation is straightforward but not free. Heartleaf extract solutions are aqueous and represent significant microbial substrate, so preservation systems must be designed for the full water phase, not just the residual. Most 2026 Korean ODM heartleaf bases use a 1,2-hexanediol plus caprylhydroxamic acid or chlorphenesin combination, sometimes with phenoxyethanol where regulation permits. ISO 17516 microbiological limits apply: 1,000 CFU per gram for leave-on facial products, 100 CFU per gram for eye or mucosal contact products (ISO 17516:2014). Preservation efficacy tests (per ISO 11930) should be requested on every heartleaf-led formula.
4. Stability protocols matter more than usual. Because the extract is plant-derived and the actives are polyphenols sensitive to oxidation and pH drift, accelerated stability per ICH Q1A(R2) at 40 degrees Celsius and 75 percent relative humidity for six months is the standard ask, with real-time stability at 25 degrees Celsius and 60 percent relative humidity carried in parallel (ICH Q1A(R2)). Most Korean ODMs treat this as a baseline.
5. Pairing actives without canceling effect. The Anua product line pairs heartleaf with panthenol, hyaluronic acid, and centella in different SKUs. These are documented complements. Pairings that fight against heartleaf's mild acidic profile or polyphenol stability include high-pH soap surfactants, strong retinoids in the same SKU (oxidation cascade), and uncomplexed vitamin C at high concentrations. A heartleaf plus uncomplexed L-ascorbic acid product is technically possible but requires specialty chelation and inert packaging that most indie budgets cannot absorb.
Founder Note
"I'm Liz, and I run ALTA MEET from Manhattan. Heartleaf has become one of the most common briefs we field from US indie founders this year, and the version of the conversation that actually moves a product forward is almost never about percentage on the label. It is about which extract, from which region, with which solids and flavonoid spec, paired with which second active, in which packaging. If you want a quick gut-check on whether your heartleaf concept is differentiated enough to compete in 2026 retail, I'll grab 15 minutes free with you and walk through the brief with you before you commit to a development agreement."
Timeline and ODM Workflow for a Heartleaf SKU
A realistic 2026 development timeline for an indie heartleaf SKU at 3,000 to 10,000 unit MOQ with a Korean ODM looks like this. We have compressed and extended versions of this timeline depending on whether the founder accepts the ODM's existing heartleaf base or insists on a custom formulation. The numbers below reflect ALTA MEET's median timing across heartleaf briefs across the last twelve months.
Weeks 1-2: Brief and concept lock. Founder provides target retail positioning, INCI restrictions (clean beauty exclusions, vegan certification, fragrance-free requirement), packaging direction, and target landed cost. ODM responds with two or three base options from existing heartleaf systems and a custom-development option with cost delta.
Weeks 3-6: Sample rounds. Typically three to four sample rounds. The first sample uses the base, the second adjusts pH and preservation, the third and fourth refine sensory (slip, finish, scent) and address any country-of-origin labeling issue.
Weeks 7-12: Stability and safety testing. Accelerated stability per ICH Q1A(R2), 40 degrees Celsius and 75 percent relative humidity for six months; real-time stability at 25 degrees Celsius and 60 percent relative humidity carried in parallel. Preservation efficacy per ISO 11930. Patch testing depending on claim language.
Weeks 13-16: Regulatory work. US MoCRA facility registration, product listing, responsible person, and label review per FDA expectations (ALTA MEET MoCRA registration guide). For EU sale, CPNP notification and a CPSR with a qualified safety assessor. For UK sale, SCPN filing.
Weeks 17-22: Production, packaging, fill, and shipping. Typical 6 to 8 weeks from PO confirmation to first shippable carton, plus 14 to 21 days of ocean freight to a US 3PL.
Total: 20 to 24 weeks from signed brief to first US warehouse arrival. Founders who shortcut the stability and regulatory steps (a common mistake covered below) typically save four to six weeks but inherit retail-rejection risk that costs much more downstream.
Common Mistakes Indie Founders Make on Heartleaf Briefs
Five we see in almost every initial conversation:
1. Demanding 99 percent or 100 percent heartleaf claims. Above the 77 to 80 percent that Anua and One Thing established, the marginal benefit of a higher percentage is sensory and marketing, not biological. Going to 99 percent forces sacrifices in preservation budget (less room for humectants, less room for the preservation system) and usually produces a product that is functionally identical to a 75 percent version with a more fragile preservation profile. Reserve the higher percentage for limited-run packaging plays.
2. Treating heartleaf as a single ingredient on the INCI line. A modern heartleaf SKU competes against Anua and One Thing on the entire INCI, not just the heartleaf claim. Indie founders who do not pair heartleaf with at least one well-documented secondary active (panthenol, hyaluronic acid, centella, fermented filtrate, mugwort, or one of the well-tolerated PHA acids) are launching into a category where the comparison shoppers will spot the gap in the first thirty seconds on their phone.
3. Skipping fermentation spec when the brand positioning calls for it. "Fermented heartleaf" reads premium and is supported by recent literature. Calling a product fermented when only a fraction of the heartleaf is actually fermented broth is a label that buyers (and increasingly TikTok ingredient reviewers) will fact-check. Either commit to a documented fermented broth at meaningful inclusion (10 percent and above) or do not use the word.
4. Underestimating preservation budget. A 70 percent or higher aqueous extract solution carries real microbial risk. Some indie founders, drawn to clean-beauty marketing, ask their ODM to remove phenoxyethanol and 1,2-hexanediol both. The resulting preservation system either fails ISO 11930 or requires a much more expensive preservation package using fermented filtrates and pentylene glycol, often adding $0.20 to $0.50 per unit to COGS. Founders should price this in early.
5. Confusing Korean-grown with Korean-manufactured. A bottle that says "Made in Korea" can contain a Chinese-grown Houttuynia cordata extract perfectly legally. If your retail positioning rests on Korean sourcing, your packaging should say "Korean-grown heartleaf" specifically, and your supply documentation should support that claim if a buyer ever audits.
Key Takeaways
Heartleaf demand in the US is no longer educational; the category is mass-aware in 2026, anchored by Anua's bestseller status and reinforced by viral TikTok content through 2025.
The "77 percent" claim describes the extract solution share of the formula, not flavonoid content; serious briefs specify extract percentage, extract solids, and quercetin or total flavonoid mg per 100 g.
The most current scientific momentum is on fermented Houttuynia broth, which a 2024 PMC study linked to inflammatory and apoptotic factor reduction in LPS-stimulated keratinocyte models with documented skin barrier repair markers.
Korean-grown extract costs 1.6 to 2.2 times Chinese-grown at indie volumes; the decision is about label strategy more than ingredient cost.
Indie-volume per-unit extract cost is usually $0.07 to $0.52 depending on SKU; packaging, fill, and ODM mark-up dominate finished cost.
Formulate at pH 5.0 to 5.5; specify accelerated stability per ICH Q1A(R2) and preservation efficacy per ISO 11930; expect 20 to 24 weeks from brief to US warehouse arrival.
Pair heartleaf with at least one documented secondary active; commit to fermentation only when you actually use a fermented broth at 10 percent or higher.
FAQ
Is heartleaf safe for pregnancy?
Houttuynia cordata extract is generally considered safe in topical cosmetic use and is approved for cosmetic application in the EU, US, and Asia per regulatory ingredient databases (COSMILE Europe). For specific pregnancy questions, indie founders should not make pregnancy-specific safety claims on a heartleaf SKU without an individual safety assessment and consultation with their regulatory advisor.
Can I claim heartleaf as a "functional cosmetic" ingredient under KFDA?
KFDA's functional cosmetic categories (whitening, anti-wrinkle, sun protection, anti-hair-loss, and others) require specific actives and clinical documentation. Houttuynia cordata is not on the KFDA functional cosmetic active list as a primary functional claim; it is used as a skin-conditioning ingredient. Soothing, calming, and anti-inflammatory claims should be framed as general skincare claims with stability and patch-test support, not functional cosmetic claims.
How does heartleaf compare to centella asiatica for soothing?
Both are anti-inflammatory polyphenolic botanicals widely used in Korean skincare. Centella asiatica's signature actives are madecassoside and asiaticoside; heartleaf's are quercetin, quercitrin, and related flavonoids. In practice, formulators often pair them, particularly in second-generation soothing products where buyer literacy has moved past single-actor formulas. See our centella asiatica deep dive for a parallel breakdown.
Does heartleaf work in cleansers and masks, or only in toners?
It works across formats. INCIBeauty's product survey shows heartleaf at meaningful concentrations in sheet masks (around 2 percent average), cream and gel masks, and face serums, in addition to the high-percentage toners that put it on the map (INCIBeauty: Houttuynia cordata extract). The toner format simply offers the highest tolerable concentration of the aqueous extract.
Why does heartleaf sometimes smell fishy?
The essential-oil fraction of Houttuynia cordata contains compounds that give the raw herb its distinctive fish-like aroma (the plant is colloquially called "fish mint" in some markets). The water and ethanol extracts that drive 77 percent and 80 percent claim products have most of this character removed. Founders working with the essential oil fraction should expect to encapsulate or pair with masking fragrance.
Can I private-label an existing Korean heartleaf base and launch faster?
Yes. Several Korean ODMs maintain heartleaf-led toner and ampoule bases that can be private-labeled with founder-specific packaging in 8 to 12 weeks rather than the 20-plus weeks of full custom development. The trade-off is differentiation: a private-label SKU competes against any other brand using the same base. See our Korean ODM vs OEM vs private label guide for a fuller comparison.
Working With ALTA MEET
ALTA MEET is a New York–based boutique consultancy that partners directly with Korean manufacturers on behalf of US indie beauty brands. We write the briefs, run the sample rounds, manage regulatory work for MoCRA, CPNP, and SCPN, and translate between the Korean ODM floor and the US retail buyer. We have led heartleaf and fermented broth briefs across multiple indie launches in 2025 and 2026.
If you are evaluating a heartleaf concept and want a second opinion on whether it can differentiate against the current Anua and One Thing baseline, book a free 15-min K-Beauty manufacturing gut-check with Liz. We will pressure-test your concept against the current shelf, your target landed cost, and your retail positioning before you commit to a sample round.
Reviewed for accuracy by ALTA MEET's formulation consulting team.
Sources
Anua. Heartleaf 77% Soothing Toner product page. https://anua.com/products/heartleaf-77-soothing-toner
Incidecoder. Anua Heartleaf 77% Soothing Toner ingredients (Explained). https://incidecoder.com/products/anua-heartleaf-77-soothing-toner
INCIBeauty. HOUTTUYNIA CORDATA EXTRACT ingredient profile. https://incibeauty.com/en/ingredients/16484-houttuynia-cordata-extract
COSMILE Europe. Houttuynia cordata extract regulatory profile. https://cosmileeurope.eu/inci/detail/6534/houttuynia-cordata-extract/
Wikipedia. Houttuynia cordata. https://en.wikipedia.org/wiki/Houttuynia_cordata
PMC11120194. Inhibition of LPS-Induced Skin Inflammatory Response and Barrier Damage via MAPK/NF-κB Signaling Pathway by Houttuynia cordata Thunb Fermentation Broth. 2024. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11120194/
Nature Scientific Reports. In vitro bioactivities and formulation stability of Houttuynia cordata essential oil for cosmetic applications. 2025. https://www.nature.com/articles/s41598-025-21278-x
MDPI Cosmetics. Development and Clinical Efficacy Evaluation of Facial Toner Containing Houttuynia cordata Thunb. https://www.mdpi.com/2079-9284/10/5/133
ScienceDirect. Houttuynia cordata Thunb.: A review of traditional applications, phytochemistry, pharmacology and safety. https://www.sciencedirect.com/science/article/abs/pii/S0944711323005548
Beauty Independent. Top Skincare Trends For 2026 and Those Losing Their Sizzle. https://www.beautyindependent.com/top-skincare-trends-2026-those-losing-sizzle/
Cosmetics & Toiletries. How K-Beauty Conquered 2025 Through TikTok Shop and Product Innovation. https://www.cosmeticsandtoiletries.com/research/consumers-market/news/22957413/how-kbeauty-conquered-2025-through-tiktok-shop-and-product-innovation
ISO 17516:2014 cosmetic microbiological limits. https://www.iso.org/standard/59938.html
ICH Q1A(R2) stability guideline. https://www.ich.org/page/quality-guidelines
