Hyaluronic Acid vs Polyglutamic Acid: Which Humectant Should Anchor Your K-Beauty Serum Line? (2026)
By the ALTA MEET editorial team | K-beauty ODM consulting
Every Korean ODM brief that lands on a formulator's desk in 2026 includes at least one humectant request, and the two names that keep appearing are hyaluronic acid and polyglutamic acid. Five years ago the choice was automatic: hyaluronic acid went into everything. Today, with polyglutamic acid serums growing at roughly 10.9% CAGR and finished-product brands like The Ordinary, Laneige, and I'm From launching PGA-forward SKUs, the conversation has changed. If you are an indie founder building a serum or essence with a Korean ODM, the humectant decision shapes your cost per unit, your marketing claims, and your formulation stability window. This guide compares the two head to head so you can brief your manufacturer with the right specification.
Why This Comparison Matters for Indie Founders
Hyaluronic acid (HA) and polyglutamic acid (PGA) are both water-binding actives, but they work through different mechanisms, cost different amounts at the raw-material level, and create different textures in the finished product. Picking the wrong one can mean a serum that pills under sunscreen, a unit cost that eats your margin, or marketing claims that sound identical to every other brand on the shelf.
The global cosmetic-grade HA raw material market was valued at approximately USD 1.2 billion in 2024 and is projected to reach USD 2.5 billion by 2033 at 8.9% CAGR (Verified Market Reports, 2025). The polyglutamic acid serum market was valued at USD 520 million in 2024 and is forecast to reach USD 1.35 billion by 2033, growing at 10.9% CAGR (MarketIntelo, 2025). PGA is the smaller category, but it is growing faster, and Korean ODMs are building PGA capability into their standard ingredient libraries.
For indie K-beauty founders, the decision is not abstract. It determines what you write on your brief, what your unit economics look like at 1,000 to 3,000 MOQ, and whether your hero serum has a differentiated story in a crowded hydration category.
How Each Ingredient Actually Works
Hyaluronic acid is a glycosaminoglycan, a sugar-based polymer naturally found in the dermis and epidermis. It binds up to 1,000 times its weight in water. In cosmetic formulations, HA is available in multiple molecular weights: high molecular weight (HMW, above 1,000 kDa) sits on the skin surface and forms a moisture-retaining film; low molecular weight (LMW, below 50 kDa) penetrates into the upper epidermis and delivers hydration from within. A 2025 randomized controlled trial published in the Journal of Clinical Medicine found that multi-molecular-weight HA formulations (combining large, medium, and low weights in a 2:2:1 ratio) improved skin barrier recovery and reduced transepidermal water loss more effectively than single-weight formulations alone.
Polyglutamic acid is a polypeptide produced by bacterial fermentation (typically Bacillus subtilis). It forms a breathable film on the skin surface and holds up to four times more water by weight than HA at the same concentration. However, PGA's higher molecular weight means it stays on the surface rather than penetrating into deeper skin layers. A 2024 review in MDPI Cosmetics confirmed that PGA's film-forming properties reduce transepidermal water loss while creating a lighter, less tacky skin feel compared to HA at equivalent concentrations.
The practical difference for formulators: HA delivers hydration at multiple depths (especially in multi-weight blends), while PGA creates a stronger surface moisture barrier with a cleaner sensory profile. Neither is objectively "better." The right choice depends on the product concept, the target consumer, and the rest of the formula.
Side-by-Side Comparison: What Founders Need to Know
Here is the direct comparison across the variables that matter when briefing a Korean ODM:
Molecular class: HA is a glycosaminoglycan (sugar polymer). PGA is a polypeptide (amino acid polymer).
Water-binding capacity: HA binds approximately 1,000 times its weight in water. PGA holds roughly 4 times more moisture than HA at the surface level, though HA penetrates deeper when formulated at low molecular weights.
Skin penetration: Multi-weight HA blends penetrate from the surface into the upper epidermis. PGA primarily works on the skin surface, forming a breathable film.
Typical usage rate in formulation: HA at 0.1% to 2.0% (higher concentrations can cause stickiness). PGA at 0.3% to 3.0%.
Sensory profile: HA at higher concentrations can feel tacky or heavy, especially HMW grades. PGA delivers a lighter, more refreshing texture at comparable hydration levels because its viscosity is lower at the same concentration.
Raw material cost (cosmetic grade, 2025 pricing): HA powder ranges from USD 40 to 110 per kilogram depending on molecular weight and supplier (Chinese suppliers at USD 40 to 80/kg, Korean and Japanese suppliers at USD 85 to 110/kg). PGA powder ranges from USD 180 to 300 per kilogram, roughly 2 to 3 times the cost of HA.
pH compatibility: HA is stable across pH 4.0 to 8.0. PGA is stable across pH 3.0 to 9.0, giving formulators a wider working range.
Marketing differentiation in 2026: HA is well-known to consumers but saturated as a marketing story. PGA is newer in consumer awareness and offers a "next-generation humectant" positioning.
The Korean ODM Formulation Reality
Most Korean ODMs in 2026 carry both HA and PGA in their standard ingredient libraries. The difference is in how they recommend using each one.
For HA-based serums, the standard Korean ODM approach uses a multi-weight HA blend: typically a combination of HMW (1,200 to 1,800 kDa) for surface moisture retention, medium-weight (100 to 500 kDa) for mid-layer delivery, and LMW (5 to 50 kDa) for deeper penetration. This multi-weight approach is now the default recommendation from most reputable Korean labs. A single-weight HA serum is considered outdated by 2026 standards. The multi-weight blend adds approximately USD 0.15 to 0.30 per unit to raw material costs compared to a single-weight formulation, but it produces a measurably better product.
For PGA-based serums, Korean ODMs typically recommend 0.5% to 1.5% PGA concentration in aqueous serums. At these levels, the film-forming effect is noticeable without leaving a visible residue. PGA works well in lightweight, water-based textures that Korean labs excel at. Because PGA is fermentation-derived, Korean manufacturers with established fermentation infrastructure (many of which supply ingredients for food and pharmaceutical applications as well) can source it domestically, reducing lead time compared to importing specialty grades.
The rising formulation trend at Korean ODM labs in 2026 is HA plus PGA combination products. PGA's surface film locks in the moisture that HA attracts and delivers to deeper layers. Several Korean ODMs now offer a "dual humectant" base formula that pairs multi-weight HA at 0.8% to 1.2% with PGA at 0.3% to 0.5%. This combination typically adds USD 0.40 to 0.70 per unit in raw material costs at 1,000 MOQ, but it creates a product with a clinically supported hydration mechanism and a differentiated ingredient story.
"I'm Liz, I run altameet from Manhattan, NYC. When founders ask me which humectant to put on the brief, I tell them to start with what their target consumer already understands. HA is the household name; PGA is the conversation-starter. If your brand story is 'we do the basics better,' lean HA. If your story is 'we found what comes after HA,' lead with PGA. Either way, get your ODM to run a small sensory panel before you lock the formula. If you want a quick gut-check on your humectant brief, I will give you 15 minutes free."
Email: liz@altameet.com | partnerships@altameet.com
Cost Structure: What Indie Founders Should Budget
The raw material cost is only part of the picture. Here is what the full unit economics look like for a 30 mL serum at 1,000 MOQ from a Korean ODM:
HA-forward serum (multi-weight HA at 1.0%, no PGA): Raw material cost per unit runs approximately USD 0.80 to 1.20 for the full formula (HA contribution is a fraction of this, roughly USD 0.08 to 0.15 per unit). Total ex-works cost including fill, packaging (standard dropper bottle), and labor: USD 3.50 to 5.00 per unit at 1,000 MOQ.
PGA-forward serum (PGA at 1.0%, no HA): Raw material cost per unit runs approximately USD 1.00 to 1.50 for the full formula (PGA contribution roughly USD 0.20 to 0.35 per unit). Total ex-works cost: USD 3.80 to 5.50 per unit at 1,000 MOQ. The PGA premium over HA is roughly USD 0.30 to 0.50 per unit, driven by the higher raw material cost.
Dual humectant serum (multi-weight HA at 0.8% plus PGA at 0.5%): Raw material cost per unit runs approximately USD 1.10 to 1.60. Total ex-works cost: USD 4.00 to 5.80 per unit at 1,000 MOQ. This is the most expensive option but also the one with the strongest formulation story and the best sensory performance based on lab panels.
At 3,000 MOQ, unit costs typically drop 15% to 20% across all three options because the ODM amortizes setup, stability testing, and QC overhead across more units.
The margin implication: if you retail at USD 28 to 38 for a 30 mL serum (a common indie K-beauty price point), the ex-works cost difference between an HA serum and a dual humectant serum is roughly USD 0.50 to 0.80 per unit. That difference is almost invisible at retail but gives you a materially different product and marketing story.
Stability and Shelf-Life Considerations
Both HA and PGA are water-soluble actives that perform well in aqueous formulations, but they have different stability profiles that affect how your ODM designs the product.
HA stability depends heavily on molecular weight. LMW HA (below 50 kDa) can degrade faster at elevated temperatures and in formulas with strong acids (below pH 4.0). HMW HA is more stable but can lose viscosity over time if the preservation system is not adequately designed. Standard ICH Q1A(R2) accelerated stability testing (40 degrees Celsius, 75% relative humidity for 6 months) is required by most reputable Korean ODMs. HA formulations typically pass this testing without issues when paired with an appropriate preservative system and buffered to pH 5.0 to 6.5.
PGA has broader pH stability (pH 3.0 to 9.0) and is less susceptible to thermal degradation than LMW HA. However, PGA's film-forming properties mean it can interact with certain surfactants and emulsifiers, potentially causing pilling or balling when layered under creams or sunscreens. Your ODM should test the serum in combination with the other products in your line (if you have a moisturizer or SPF) to ensure layering compatibility. This cross-product compatibility testing adds 2 to 4 weeks to the development timeline but prevents consumer complaints about pilling, which is the number one texture complaint in serum reviews.
Korean ODMs following ISO 22716 GMP and ISO 17516:2014 microbiological standards (aerobic mesophilic count below 1,000 CFU/g for leave-on products, below 100 CFU/g for eye-area products) will test both HA and PGA formulations to the same microbiological limits regardless of the active chosen.
When to Choose HA, When to Choose PGA, and When to Combine
The decision framework is not about which ingredient is superior. It is about which one fits your brand positioning, your target consumer, and your product lineup.
Choose HA when your target consumer already knows and trusts hyaluronic acid (most mainstream skincare consumers do), your formulation needs deep hydration at multiple skin depths (especially for anti-aging positioning), you want to keep raw material costs lower, or you are building a product line where "clinically proven hydration" is the lead claim. HA has decades of clinical literature behind it and is the easiest humectant to defend in marketing copy.
Choose PGA when you want a lighter, less tacky serum texture (PGA's lower viscosity at equal concentration is a genuine sensory advantage), your brand is positioned as a "next generation" or "beyond HA" line, your formula needs to work across a wider pH range (useful if combining with vitamin C at pH 3.0 to 3.5 or niacinamide at pH 5.0 to 7.0), or you want an ingredient story that stands out on the shelf in 2026. PGA is still novel enough in the US and EU markets that it generates curiosity in ingredient-aware consumers.
Combine both when you have the budget for slightly higher raw material costs (USD 0.40 to 0.70 per unit at 1,000 MOQ), you want the strongest possible hydration performance (surface film from PGA plus multi-depth delivery from HA), or you are positioned as a premium indie brand where "dual humectant technology" becomes a proprietary-feeling claim. This is the direction many Korean ODMs are actively recommending in 2026 because it produces the best sensory panel results and the most defensible clinical claims.
Five Mistakes Founders Make With Humectant Briefs
First, specifying HA without specifying molecular weight. "Hyaluronic acid" on a brief tells the ODM almost nothing. You need to specify multi-weight or single-weight, and if single-weight, which range. Without this, the lab will default to whatever they have in stock, which may be a high-molecular-weight grade that sits on the surface and feels sticky.
Second, using PGA above 2.0% without testing layering compatibility. PGA's film-forming effect becomes pronounced above 1.5%, and at 2.0% or higher it can cause pilling under moisturizers and sunscreens. Ask your ODM to run a layering panel before you commit to a high PGA concentration.
Third, ignoring the sensory panel. Numbers on a spec sheet do not tell you how the product feels on skin. Korean ODMs routinely offer small sensory panels (5 to 10 evaluators) as part of the development process. Skipping this to save 1 to 2 weeks is a false economy. Consumer returns on texture complaints cost far more than the panel.
Fourth, choosing PGA purely for marketing novelty without considering your consumer's ingredient literacy. If your target consumer does not know what polyglutamic acid is, you will need to spend marketing budget educating them. HA has the advantage of instant recognition. PGA requires explanation, which is either a cost or an opportunity depending on your brand voice.
Fifth, not requesting stability data for the specific molecular weight blend. A stability certificate for "hyaluronic acid" does not cover all molecular weights equally. LMW HA degrades differently than HMW HA. Ask your ODM for stability data that matches the exact blend in your formula, tested per ICH Q1A(R2) conditions.
Working With ALTA MEET
ALTA MEET works with indie K-beauty founders to source, brief, and manage Korean ODM relationships from Manhattan, NYC. Whether you are choosing between HA and PGA for your first serum or building a multi-SKU hydration line, we handle the cross-border communication, quality oversight, and regulatory framing so you can focus on your brand.
Related reading on ALTA MEET:
Key Takeaways
Hyaluronic acid binds 1,000 times its weight in water and works at multiple skin depths when formulated as a multi-weight blend; polyglutamic acid holds roughly four times more surface moisture than HA and forms a breathable film, but stays on the surface layer.
Multi-weight HA blends (combining HMW, medium, and LMW) are now the standard Korean ODM recommendation for serum formulations in 2026; single-weight HA serums are considered outdated.
PGA raw material costs approximately USD 180 to 300 per kilogram, roughly 2 to 3 times more than cosmetic-grade HA at USD 40 to 110 per kilogram. The finished unit cost difference at 1,000 MOQ is roughly USD 0.30 to 0.50 per unit.
Combining HA and PGA in a dual humectant formula produces the best sensory and hydration performance according to Korean ODM lab panels, at an additional cost of USD 0.40 to 0.70 per unit at 1,000 MOQ.
PGA's wider pH stability range (pH 3.0 to 9.0 versus HA's pH 4.0 to 8.0) makes it a better choice for formulas pairing with low-pH actives like vitamin C.
The biggest formulation risk with PGA is pilling under moisturizers and sunscreens at concentrations above 1.5%. Layering compatibility testing should be part of your ODM brief.
For indie founders choosing between the two: HA is the safer, better-known, lower-cost option with deep clinical evidence. PGA is the differentiation play with a lighter texture and a newer ingredient story. Combining both is the premium path.
Frequently Asked Questions
Can I use both hyaluronic acid and polyglutamic acid in the same serum? Yes, and Korean ODMs are increasingly recommending this approach. PGA's film-forming barrier complements HA's multi-depth water binding. A typical combination uses multi-weight HA at 0.8% to 1.2% with PGA at 0.3% to 0.5%. This dual approach adds approximately USD 0.40 to 0.70 per unit at 1,000 MOQ but produces the best hydration and sensory results in lab panels.
Is polyglutamic acid safe for sensitive skin? PGA is generally well-tolerated. It is a fermentation-derived polypeptide (produced by Bacillus subtilis), not a synthetic chemical. It does not penetrate deeply into the skin, which reduces irritation risk. However, as with any active, your Korean ODM should conduct patch testing as part of the standard ISO 17516:2014 safety evaluation. Sensitive-skin claims require additional clinical documentation per MoCRA cosmetic-claim guidelines.
What molecular weight of hyaluronic acid should I specify on my ODM brief? Specify a multi-weight blend unless you have a specific reason for single-weight. A common Korean ODM recommendation is HMW (1,200 to 1,800 kDa) for surface hydration, medium-weight (100 to 500 kDa) for mid-layer delivery, and LMW (5 to 50 kDa) for deeper penetration, in a 2:2:1 ratio. This produces a serum that hydrates at multiple depths rather than just sitting on the surface.
Does PGA replace the need for hyaluronic acid in a formula? Not necessarily. PGA excels at surface moisture retention and has a lighter texture, but it does not deliver hydration to deeper skin layers the way LMW HA does. If your product positioning is "deep hydration" or "anti-aging moisture," HA (especially multi-weight) is still the stronger choice. If your positioning is "lightweight barrier support" or "moisture seal," PGA can stand alone effectively.
What is the minimum order quantity for an HA serum versus a PGA serum from a Korean ODM? MOQ floors are typically the same regardless of which humectant you choose: 1,000 to 3,000 units for most Korean ODMs serving indie brands. The humectant choice affects per-unit raw material cost, not MOQ. Some ODMs may require a slightly higher MOQ for PGA-forward formulas if they need to order PGA raw material specifically for your batch rather than pulling from existing stock.
How long does stability testing take for humectant serums? Standard ICH Q1A(R2) accelerated stability testing runs for 6 months at 40 degrees Celsius and 75% relative humidity. Most Korean ODMs will provide a preliminary stability readout at 3 months, which is enough to proceed with initial production in many cases. Real-time stability testing (25 degrees Celsius, 60% relative humidity for 12 to 24 months) runs in parallel. Budget 3 to 6 months for stability before your first production run.
Will consumers recognize polyglutamic acid on the ingredient list? Consumer awareness of PGA is growing but still significantly lower than HA awareness. Ingredient-savvy consumers (the Sephora and K-beauty enthusiast segments) are increasingly familiar with PGA, but mainstream consumers may not recognize it. If PGA is your hero ingredient, budget for ingredient education in your marketing. Some brands address this by listing "Polyglutamic Acid (PGA)" with a parenthetical explanation in marketing materials, while the INCI name on the label follows standard nomenclature.
Reviewed for accuracy by ALTA MEET's formulation consulting team.
References:
MarketIntelo. Polyglutamic Acid Serum Market Research Report 2033. 2025.
Verified Market Reports. Cosmetic Grade Hyaluronic Acid Market. 2025.
Journal of Clinical Medicine. Effect and Safety of Skincare Regimens Containing Multi-Molecular Hyaluronic Acid Complex. 2025.
MDPI Cosmetics. Polyglutamate: Unleashing the Versatility of a Biopolymer for Cosmetic Industry Applications. 2024;11(3):76.
Grand View Research. Hyaluronic Acid Raw Material Market Industry Report. 2025.
InSpec Solutions. Hyaluronic Acid Molecular Weight: Why Size Matters In Skincare Formulation. 2025.
ISO 17516:2014. Cosmetics: Microbiology. Microbiological limits.
ISO 22716:2007. Cosmetics: Good Manufacturing Practices (GMP).
ICH Q1A(R2). Stability Testing of New Drug Substances and Products.
