Rice Water in Korean Skincare: ODM Sourcing (2026)
By the ALTA MEET editorial team | K-beauty ODM consulting
Every week a US indie founder forwards us a brief that says "rice serum, like Beauty of Joseon." That sentence sounds clean, but inside a Korean ODM quote room it is roughly ten different products. "Rice" on an INCI list can be a ferment filtrate, a bran extract, a bran water, a starch, or a lees extract, and each of those costs something different, behaves something different on accelerated stability, and lands on a slightly different MoCRA claim line.
This is the 2026 Korean ODM sourcing guide for rice that we wish brands had before their first sample round. We will walk through what "rice" actually means on a Korean spec sheet, what the active chemistry does on skin (and what clinical data actually supports), the Hanbang lineage that explains the current wave, how a Korean ODM formulates a rice hero product at 1,000 MOQ, what it costs landed in the US, and which claim lines stay inside MoCRA, EU CPNP, and KFDA Functional Cosmetic boundaries.
What "Rice" Actually Means on a Korean ODM Spec Sheet
There is no single rice ingredient. There are at least five distinct INCI forms a Korean ODM will offer, and the difference between them is not cosmetic.
Oryza Sativa (Rice) Bran Water. The water-soluble fraction collected when rice bran is steeped or steam-extracted in water. This is the form Beauty of Joseon's Glow Deep Serum leads with at roughly 68 to 78 percent of the formula depending on the batch. It is a high-water-content humectant carrier loaded with rice-derived amino acids and minerals. Cheap as a raw material. Easy to formulate around. Mild claim profile (hydration, softening).
Oryza Sativa (Rice) Bran Extract. A more concentrated extract from rice bran solids, typically delivered as a propylene-glycol or BG (butylene glycol) solution. Carries higher concentrations of gamma-oryzanol, ferulic acid, and tocotrienols. Used at 1 to 5 percent of the finished formula. This is where the antioxidant and brightening claim line lives.
Oryza Sativa (Rice) Ferment Filtrate, or Lactobacillus/Rice Ferment Filtrate. Rice extract fermented with Lactobacillus or yeast strains. The fermentation breaks down rice polysaccharides into smaller peptides, organic acids, and free amino acids. This is the K-beauty Hanbang-coded form. It mirrors Saccharomyces Ferment Filtrate (the SK-II Pitera molecule) in mechanism but is sourced from rice rather than sake yeast. Used at 5 to 30 percent of the formula.
Oryza Sativa (Rice) Lees Extract. Lees is what remains after rice has been fermented into sake or makgeolli. The extract is rich in inositol, kojic-acid-adjacent metabolites, and free amino acids. This is the most overtly Hanbang ingredient because it carries the cultural memory of the sake-brewer hands story that originally launched Pitera. Used at 2 to 10 percent.
Oryza Sativa (Rice) Starch and Oryza Sativa (Rice) Powder. Physical actives. Used for soft-focus blurring effect in primers, balancing powders in cushions, and texture in cleansing balms. Cosmetic chemistry, not brightening chemistry. We mention it because indie founders sometimes brief "rice powder" thinking they will get the brightening profile, and a Korean ODM will quote it as a texture ingredient at one-tenth the cost.
When you brief "rice serum" without specifying which form, a Korean ODM will quote the cheapest combination that satisfies the surface request. That is usually bran water at 60 to 70 percent plus a token 0.1 percent rice extract for INCI placement. The cost difference between that and a serum that leads with 78 percent rice ferment filtrate plus a 3 percent rice bran extract is roughly 40 to 60 percent at the bulk level. Specify the form.
The Active Chemistry: Gamma-Oryzanol, Ferulic Acid, Inositol, Allantoin
Rice bran is one of the most-studied antioxidant plant materials in food science, which is why the cosmetic data inherits a strong foundation. The molecules that matter for skincare are roughly:
Gamma-Oryzanol. A mixture of ferulic acid esters of plant sterols (cycloartenyl ferulate, 24-methylenecycloartanyl ferulate, campesteryl ferulate). It is the dominant antioxidant fraction of rice bran. Black rice bran contains roughly 118 mg per gram of gamma-oryzanol in the dry bran, and in vitro studies have measured tyrosinase inhibition at roughly 80 percent at concentrated doses (Mirae-Phongtongpasuk et al., reported via the cosmetic ingredient literature). Tyrosinase is the rate-limiting enzyme in melanin synthesis, so this is the brightening mechanism that brands cite when they label rice serums as tone-evening.
Ferulic Acid. A phenolic acid that makes up roughly 56 to 77 percent of total phenols in rice bran. Ferulic acid is the antioxidant that Skinceuticals built the CE Ferulic brand around, where it sits at 0.5 percent alongside 15 percent L-ascorbic acid and 1 percent alpha-tocopherol. Inside a rice extract it is bound, not free, so the punch is gentler and the stability window is longer.
Inositol. A small carbohydrate alcohol present at meaningful concentrations in rice and especially in rice lees. Inositol has documented mild humectant and barrier-supporting behavior, and in the Hanbang reference frame it is often the molecule credited for the "polished" or "plumped" finish that Joseon-era rice water users described.
Allantoin (rice-derived). Not the molecule's primary source, but rice bran extracts often carry small amounts of allantoin and allantoin-adjacent compounds that contribute to the soothing claim line.
Free Amino Acids, Peptides, Polysaccharides. Yeast/rice fermentation filtrate is documented in the 2025 peer-reviewed literature to be rich in amino acids, organic acids, peptides, polysaccharides, polyphenols, and vitamins, with measured moisturizing, antioxidant, anti-inflammatory, brightening, and anti-aging activity in vitro and in finished cosmetic application (PMC12561143, 2025).
The practical Korean ODM read on this is straightforward: the brightening claim should anchor to gamma-oryzanol and ferulic acid via a bran extract at 1 to 5 percent; the hydration and barrier claim should anchor to bran water or ferment filtrate at 30 to 78 percent; and the soothing claim is supported in the background by the polysaccharide and amino acid fraction of the ferment.
What Clinical Data Actually Says (Brightening, Barrier, TEWL)
Indie founders often inherit rice claims from marketing decks rather than from clinical data . Here is what the published literature actually supports:
A 4-week clinical trial of a 2 percent black rice bran extract lotion reported a 28 percent reduction in transepidermal water loss (TEWL) and a 35 percent reduction in redness scores in sensitive-skin participants (Brieflands JJNPP, Evaluating the Efficacy of Lotion Containing Black Rice Bran Extract as Skin Brightening Agent: A Clinical Trial). The same study reported visible improvement in skin tone uniformity over the 4-week window.
In vitro work on black rice bran extract has measured tyrosinase inhibition at approximately 80.5 percent at the concentrations tested in the cited studies. The translation from in vitro tyrosinase inhibition to in vivo brightening is never one-to-one, but the directional signal is consistent.
The 2025 yeast/rice fermentation filtrate paper in PMC (PMC12561143) demonstrated combined antioxidant and anti-aging activity in cosmetic application when fermentation filtrate was paired with sialic acid.
Two important caveats for founder briefs. First, much of the human clinical data on rice in cosmetics uses black rice rather than common white-rice bran. Black rice carries more gamma-oryzanol and more anthocyanin pigments. A formulation written around common rice ferment filtrate at 30 percent is not the same product as a formulation written around 2 percent black rice bran extract, even though both honestly label as "rice." Second, the TEWL and redness reductions cited above are from 4-week clinical windows, not 48-hour windows. Founder claims like "instant brightening" do not survive a regulatory review when the supporting data is a 4-week study.
For MoCRA-compliant claim copy, the supportable lines for a rice hero serum at the concentrations indie ODM quotes typically deliver are roughly: visibly improves skin radiance, supports a more even-looking skin tone, helps reduce the appearance of dullness, hydrates and softens the skin, and (with a 2 percent black rice bran extract or 30 percent ferment filtrate dose plus a 4-week consumer test) helps reduce the appearance of uneven skin tone over time.
The Hanbang Lineage: From Mi-an-su to Beauty of Joseon
Rice water as a beauty practice predates the cosmetic industry by several centuries in Korea. Mi-an-su (미안수, literally "beautiful-face water") refers to the milky water reserved from the second rinse of unpolished rice. Joseon-era documents describe court women splashing it across the face after washing as the final rinse step. The mechanism that the historical text credits is something like "the water carries the essence of the grain."
That sentence reads as folk medicine, but it maps cleanly onto contemporary cosmetic chemistry. The second rinse of rice carries the broken-down outer layer of the grain (the bran), which is the gamma-oryzanol, ferulic acid, inositol, and amino acid fraction we just walked through. Joseon-era women were doing a low-concentration bran water rinse without knowing the molecule names.
The Hanbang ingredient frame is what Beauty of Joseon, Haruharu Wonder, I'm From, and SkinFood have all built around in the last decade. Beauty of Joseon's Glow Deep Serum uses 68 to 78 percent rice bran water plus 2 percent alpha-arbutin and a niacinamide co-active as the structural form of a brightening serum. The cultural claim is "Joseon-era beauty practice," and the modern claim is "tone evening via tyrosinase-inhibition co-actives."
For an indie founder pitching a rice line in 2026, the Hanbang lineage is the brand-story moat. The ingredient itself is now widely sourced. The story of why a Korean woman would have splashed mi-an-su on her face in 1750 is the part American mass-market brands cannot copy without sounding extractive.
I'm Liz, I run ALTA MEET from Manhattan. Most indie founders who brief us on a rice hero arrive with the Beauty of Joseon SKU as the reference and a budget that wants the same finished feel at 1,000-unit MOQ. The realistic path is usually a 30 to 50 percent rice ferment filtrate base plus a 1 to 3 percent bran extract and a tone-evening co-active (alpha-arbutin or niacinamide), priced inside a $4.50 to $7.20 cost-of-goods window. If you want a quick gut-check on whether your rice serum brief is structured to hit that, grab 15 minutes free with me.
How Korean ODMs Formulate a Rice Hero Product
A Korean ODM is going to ask you four questions before they quote a rice serum, and your answers determine which form of rice they spec.
Question 1: What is the brightening claim?
If the claim is "tone evening, supports a more uniform skin tone over time," the ODM will spec a 1 to 3 percent bran extract for the gamma-oryzanol and ferulic acid load, plus a co-active like 2 percent alpha-arbutin or 5 to 10 percent niacinamide. If the claim is purely "glow and hydration," they will skip the bran extract and lead with bran water or ferment filtrate alone.
Question 2: What hydration and barrier behavior do you want?
For a barrier-supporting profile, ferment filtrate at 30 to 50 percent. The fermented peptides and amino acids are humectant-supportive and the polysaccharides provide a mild film-forming effect that supports the barrier. For a lighter, more essence-like feel, bran water at 60 to 78 percent does the same humectant work at lower cost and lighter texture.
Question 3: What is the texture you want at the dropper tip?
Rice ferment filtrate viscosities tend to be thin and pour like water. Bran extract at 5 percent thickens slightly. To hit a "slip" or a "cushion" texture, the ODM will add a small amount of a polysaccharide gum (xanthan, sclerotium gum) and a glycerin-glycol-water humectant system at 8 to 15 percent. None of this is exotic. It is the standard Korean serum architecture.
Question 4: What preservation system?
This is the question indie founders skip and then get burned on at stability. A high-water-content rice formula (rice is essentially food for microbes) needs a properly-validated preservation system. Korean ODMs typically use 1,2-hexanediol plus caprylhydroxamic acid plus a low-percentage phenoxyethanol or ethylhexylglycerin combination, or a Korea-permitted naturally-derived preservation system like leuconostoc/radish root ferment filtrate plus the same 1,2-hexanediol. Whatever the choice, an ISO 11930 preservative efficacy test (PET) at full formulation with the rice load actually in it is non-negotiable. We have seen rice serums pass PET in a stripped-down vehicle and then fail when the 30 percent ferment filtrate is added back, because the ferment carries its own microbial load.
A standard Korean ODM brief structure for a rice hero serum at 1,000 MOQ looks roughly like:
Rice ferment filtrate (Oryza Sativa Ferment Filtrate or Lactobacillus/Rice Ferment Filtrate): 30 to 50 percent
Oryza Sativa (Rice) Bran Extract: 1 to 3 percent
Co-active for brightening: alpha-arbutin 2 percent or niacinamide 5 to 10 percent
Humectant system: glycerin 5 to 8 percent, propanediol 2 to 4 percent, panthenol 1 percent
Texture: xanthan gum 0.2 percent or sclerotium gum 0.3 percent
Preservation: 1,2-hexanediol 1 to 2 percent plus caprylhydroxamic acid 0.1 percent
pH adjuster to land at 5.0 to 5.5
Water and trace fragrance/calming actives (centella, mugwort, etc., if branded that way) to balance
That formula will pass ISO 11930 PET when correctly preserved, pass ICH Q1A(R2) accelerated stability for the standard 3-month 40°C / 75% RH window with proper rheology design, and meet ISO 17516:2014 microbiological limits (1,000 CFU/g for leave-on standard, 100 CFU/g for any eye-area variant) when batched in a reputable ISO 22716 Cosmetic GMP facility.
The 1,000-MOQ Cost Map for a Rice Serum
Here is what a 1,000-unit, 30 ml indie rice hero serum actually costs at landed-in-US through a reputable Korean ODM in 2026. Numbers are ranges from our consulting practice across roughly two dozen indie K-beauty briefs in the last 18 months. Component costs at 1,000 MOQ:
Bulk formula cost per unit (30 ml, ferment-filtrate-led, with a 1 to 3 percent bran extract and a brightening co-active): $1.40 to $2.80
Primary packaging (30 ml glass dropper bottle, frosted or amber, with dropper assembly): $0.85 to $1.60
Secondary packaging (folding carton, FSC paper, 4-color print): $0.30 to $0.65
Insert / leaflet (multi-language for US plus Korea export): $0.05 to $0.15
Labeling (front and back label, FDA/MoCRA-compliant text, KFDA notation if dual-market): $0.10 to $0.25
Filling, capping, retorquing, leak test, labor at the Korean fill line: $0.35 to $0.70
ISO 11930 PET, ICH Q1A(R2) accelerated and intermediate stability, microbiological release (ISO 17516:2014): typically amortized across the first three production batches at $0.40 to $0.90 per unit on the first batch
Korean ODM markup, project management, formulation IP, sample rounds: $0.50 to $1.30
Korean inland transport to Incheon, ocean freight or air freight to US port, US customs broker fee, US duty under MoCRA-registered facility: roughly $0.55 to $1.15 per unit depending on freight mode and US tariff line at the time of clearance
The realistic landed cost-in-US for a 1,000-unit rice ferment serum that meets the spec above is $4.50 to $7.20 per unit. The retail-pricing math at a standard indie K-beauty 4 to 5x markup lands you at $22 to $36 retail. That is the live indie-K-beauty competitive band that Beauty of Joseon, Haruharu Wonder, and Anua all occupy.
Two cost levers that matter and indie founders often miss. First, the rice ferment filtrate raw material itself ranges roughly $18 to $55 per kilogram at Korean ODM purchase scale depending on the supplier and the strain (Lactobacillus vs Saccharomyces vs proprietary strain blend). At 50 percent of a 30 ml formula, that is 15 grams of ferment per unit, or about $0.27 to $0.82 of raw material per unit. Specifying a premium strain pushes you toward the top of the bulk cost range. Second, asking for a "78 percent rice ferment filtrate" headline figure (matching Beauty of Joseon's Glow Deep Serum copy) usually pushes bulk cost above $2.80 per unit because you are essentially formulating the serum out of the ferment rather than around it. That is a real ingredient story, but it is a real cost step.
For UK indie founders briefing in pounds, the same landed-in-UK cost lands roughly at £3.60 to £5.80 per unit in 2026 based on the same component math at current GBP/USD and the UK's post-Brexit cosmetic notification regime adding a small CPNP-equivalent registration cost amortized across the first batch.
For deeper landed-cost math, see our Korean skincare manufacturing cost guide and our how to read a Korean ODM quote line-by-line.
Regulatory Lines: MoCRA Claims, EU CPNP Notification, KFDA Functional Cosmetic Frame
Oryza Sativa rice ingredients are not novel cosmetic actives. The CIR (Cosmetic Ingredient Review) Expert Panel has reviewed Oryza Sativa (Rice) Extract and related rice-derived ingredients and concluded they are safe at the current practices of use and concentration in cosmetic products. Oryza Sativa Extract carries CAS number 90106-37-9 and is functionally classified across abrasive, absorbent, bulking agent, hair conditioning, and skin conditioning categories in INCI taxonomy.
For a US-market rice serum, the regulatory frame is MoCRA (Modernization of Cosmetics Regulation Act of 2022). Under MoCRA, you need facility registration of your Korean manufacturer with FDA, product listing (every SKU including each rice serum variant), adverse event reporting setup, labeling review under the FDA cosmetic labeling rules, and safety substantiation file. The safety substantiation for a rice serum at the concentration ranges we describe above is well-supported by the published cosmetic ingredient literature plus a finished-product PET, accelerated stability, and a 4-week consumer use study if you want to claim tone-evening or brightening. For the MoCRA registration walkthrough, see our FDA Korean skincare import guide.
For an EU-market launch, the rice serum must be notified to the CPNP (Cosmetic Products Notification Portal) under EU Regulation (EC) 1223/2009. A Responsible Person inside the EU must be designated. The Product Information File (PIF) includes the full quantitative formula, safety assessment by a qualified safety assessor, ISO 11930 PET, ICH Q1A(R2) stability, microbiological compliance, and the claims-supporting evidence dossier. There is no rice-specific EU restriction list to work through for the forms described here. Common ferment filtrates and bran extracts are permitted; the constraints are on the preservation system and on claim substantiation.
For a dual-market US plus Korea launch, the KFDA Functional Cosmetic framework matters. "Functional cosmetic" in Korea is a regulated category for whitening, anti-wrinkle, sunscreen, hair color/wave/relaxing, body cleansing, and skin barrier products. If your rice serum claims "skin whitening" inside Korea, it requires KFDA functional cosmetic approval, which requires a clinical efficacy file with niacinamide or alpha-arbutin or arbutin or another KFDA-listed brightening active at the KFDA-specified concentration as the functional active (rice itself is not on the KFDA functional whitening active list). For Korea-domestic claims, lean on the alpha-arbutin or niacinamide co-active for the regulatory frame and use rice for the brand story.
Claim copy that stays inside MoCRA, EU CPNP, and KFDA Functional Cosmetic boundaries for a typical indie rice serum at the spec above:
Visibly improves skin radiance
Helps brighten the look of dullness
Supports a more even-looking skin tone
Hydrates and softens the skin
Inspired by Joseon-era beauty rituals (cultural/heritage claim, no efficacy assertion)
With Hanbang-tradition rice ingredients (cultural/heritage claim)
Claim copy that crosses regulatory lines and we strike from every brief:
"Whitens skin" (only inside Korea with KFDA functional cosmetic approval; outside Korea, "whitening" is a regulated drug-style claim under FDA)
"Erases dark spots" / "fades hyperpigmentation" (drug claim under FDA)
"Anti-aging" without substantiation (acceptable under MoCRA only with claims-supporting evidence; EU requires the same)
"Clinically proven brightening" without the actual clinical trial on the finished formula in your file
"Rice ferment filtrate is the secret to younger skin" (unsubstantiated efficacy claim, plus "secret" is the kind of marketing-fluff phrasing that does not survive a regulatory review when you are challenged)
What Indie Brands Get Wrong With Rice (5 Common Briefing Mistakes)
We have run this play enough times to see the same five mistakes:
Mistake 1: Naming "rice" without naming the form. Costs you 40 to 60 percent at bulk. The Korean ODM will give you the cheapest viable rice form unless you specify ferment filtrate or bran extract at a percentage.
Mistake 2: Anchoring marketing copy to "78 percent rice" without budgeting for it. That headline figure means the serum is essentially formulated out of the ferment, not around it, and pushes the bulk cost step up by $1.00 to $1.80 per unit.
Mistake 3: Skipping ISO 11930 PET on the full formula with the rice ferment actually loaded in. A rice formula is microbially active substrate. PET on a stripped vehicle is not predictive. We have seen indie brands recall first production after a contamination incident traced back to a ferment lot that passed COA on arrival but exceeded ISO 17516:2014 limits in the finished formula at the 90-day stability pull.
Mistake 4: Stating "brightening" or "whitening" as the marketing headline without a clinical trial on the finished formula. Rice ferment plus niacinamide plus alpha-arbutin does brighten with documented tyrosinase-inhibition mechanism, but the legal claim copy under MoCRA must trace back to claims-supporting evidence on the finished SKU. "Visibly improves radiance" is supportable from the literature. "Whitens" is not, outside KFDA approval.
Mistake 5: Building the brand story on Hanbang without sourcing the ingredient in Korea. Several US private-label houses will ship a rice ferment filtrate from a non-Korean fermentation house. Technically the same molecule. Brand-story consistency on a Korean ODM brief means the ferment is sourced in Korea. The cost difference is small. The brand-story integrity difference is large.
Key Takeaways
"Rice" is at least five distinct INCI forms (bran water, bran extract, ferment filtrate, lees extract, starch/powder). Specifying the form is the single biggest cost lever on a Korean rice serum brief.
The brightening mechanism rests on gamma-oryzanol and ferulic acid in bran extract at 1 to 5 percent, often combined with alpha-arbutin (2 percent) or niacinamide (5 to 10 percent) as the regulated whitening active.
Clinical data on black rice bran extract supports a 28 percent TEWL reduction and 35 percent redness reduction at 2 percent in 4 weeks (Brieflands JJNPP), with in vitro tyrosinase inhibition near 80 percent. Translation to a finished commercial formula requires its own consumer test.
A 1,000-MOQ rice ferment serum at 30 ml lands at $4.50 to $7.20 cost-in-US (roughly £3.60 to £5.80 in UK) for a spec that meets ISO 22716, ISO 11930, ISO 17516:2014, and ICH Q1A(R2).
Under MoCRA, the supportable claim line for a rice serum is "visibly improves radiance" and "supports a more even-looking skin tone." "Whitening" is a regulated drug-style claim outside KFDA functional cosmetic approval.
The Hanbang lineage (mi-an-su, Joseon-era rice water beauty practice) is the brand-story moat. The ingredient itself is widely sourced; the cultural memory is not.
Frequently Asked Questions
Q1: Can I source rice ferment filtrate at a lower MOQ than 1,000 units? Yes, sometimes. Some Korean private-label houses run a stock-formula rice ferment serum at 300 to 500 unit MOQ with brand-overlay packaging. The trade-off is that the formula is shared across multiple brands, the active concentration is usually toward the bottom of the range we describe above, and you do not own the formulation IP. For a true custom indie ODM build with formula ownership, 1,000 to 2,000 unit MOQ is the realistic entry. See our flexible MOQ Korean cosmetics guide for the trade-off math.
Q2: Does rice ferment filtrate cause irritation in sensitive skin? The published 4-week clinical trial on 2 percent black rice bran extract reported a 35 percent reduction in redness scores in sensitive-skin participants, which is the opposite of an irritation signal. That said, sensitivity is individual. The fermentation byproducts (organic acids, peptides) can occasionally trigger reactions in compromised barrier skin. A 7-day consumer use study at the prototype stage is the practical guard.
Q3: How does rice compare to Centella Asiatica for the soothing and barrier claim? Rice ferment delivers humectant and polysaccharide-driven barrier support. Centella delivers triterpene-driven (madecassoside, asiaticoside) wound-healing-adjacent mechanism with stronger published clinical data for barrier and post-procedure recovery. Many Korean ODM rice serums incorporate 0.5 to 2 percent centella extract as a soothing co-active for exactly this reason. The two are commonly co-formulated, not competing.
Q4: Is rice ferment filtrate the same molecule as Pitera (SK-II)? No. Pitera is Pitera Saccharomycopsis Ferment Filtrate, a proprietary yeast ferment that SK-II patented based on a 1970s observation that sake-brewer hands stayed youthful. Rice ferment filtrate is fermented rice (typically Lactobacillus-fermented, sometimes yeast-fermented), so the substrate is different. The mechanism overlap (free amino acids, organic acids, peptides as humectants and barrier-supporting actives) is real. The molecules are not identical.
Q5: Can I claim "anti-aging" on a rice serum under MoCRA? Yes, with claims-supporting evidence on the finished formula. Anti-aging is not a regulated drug claim under MoCRA; it is a cosmetic claim that requires substantiation. A 4 to 12 week consumer use study on the finished SKU measuring fine line appearance, skin firmness, and radiance is the typical evidence package. Without the study, scale the claim language back to "supports the look of youthful skin" or "helps reduce the appearance of dullness" and keep the substantiation file lighter.
Q6: What pH should a Korean rice ferment serum land at? 5.0 to 5.5 is the typical formulation window. Rice ferment filtrate naturally sits in a mildly acidic range, which aligns with skin's biological pH. Below 4.5, you risk destabilizing certain co-actives (notably arbutin, which is sensitive to acid hydrolysis); above 6.0, you push the preservation system and risk barrier irritation in sensitive users.
Q7: How long should the stability and shelf-life claim be? Standard Korean ODM stability protocols run ICH Q1A(R2) accelerated at 40°C / 75% RH for 3 months and intermediate at 30°C / 65% RH for 6 months, plus real-time at 25°C / 60% RH for 12 to 24 months. The published shelf-life claim on the finished SKU is typically 24 months unopened and 6 to 12 months PAO (period after opening) once the dropper is exposed to air. For a high-water-content rice ferment serum, we usually advise 6 months PAO until the brand has accumulated real consumer-use data to extend it.
Reviewed for accuracy by ALTA MEET's formulation consulting team.
Working With ALTA MEET
ALTA MEET is a Manhattan, NYC based K-Beauty Manufacturing Partner connecting US indie brands to Korean ODM partners across Seoul. We brief, vet, quote-read, and ship oversight for the indie founders who want a Beauty of Joseon-tier rice serum at indie MOQ without the in-house cost of building a product team.
If you are writing your first rice brief and want a second pair of eyes on the form spec, the concentration math, or the MoCRA claim copy before you send it to a Korean ODM, book your free 15-min K-Beauty manufacturing gut-check with Liz. Fifteen minutes, two routing quest
