Custom Hyaluronic Acid Oral Liquid – Private Label Manufacturing

For brands that need hyaluronic acid in liquid form — not a generic "HA supplement" formulated with whatever sodium hyaluronate the factory sourced from a supplier, but a product where the molecular weight profile is specified, verified, and stable from fermentation to the finished bottle.

Why HA Molecular Weight Matters More in Liquid Than in Any Other Format

Hyaluronic acid (sodium hyaluronate) is one of the most popular beauty and joint health supplement ingredients globally. In capsule or tablet form, the molecular weight of HA matters for absorption — but it doesn't affect the physical properties of the product. In liquid form, molecular weight determines everything:

Viscosity: HA is a high-molecular-weight polysaccharide. Even at low concentrations (0.01–0.1%), it dramatically increases the viscosity of an aqueous liquid. The higher the molecular weight, the thicker the liquid at the same concentration. A liquid formulated with 1,500 kDa HA at 0.05% will be noticeably thicker than one with 50 kDa HA at the same concentration. If the MW isn't controlled, the viscosity isn't controlled — and the product may not dispense from its intended packaging.

Absorption pathway: Different molecular weight HA fractions are absorbed through different mechanisms. Low MW HA (≤50 kDa) can be absorbed intact through intestinal epithelium. High MW HA (>500 kDa) is primarily broken down by gut bacteria and intestinal hyaluronidase before absorption. The bioavailability profile of your product depends on the MW distribution — and if you don't know the MW, you can't reference the right clinical data.

Target tissue: Clinical research suggests different MW fractions may support different tissues. Low MW HA is associated with skin deposition and hydration support. High MW HA is associated with joint lubrication and connective tissue support. A product formulated without MW specification may not deliver the targeted benefit your brand is promising.

Stability: HA in aqueous solution undergoes slow depolymerization over shelf life, particularly at elevated pH or temperature. This means the MW distribution at production may not be the same at month 12. If MW drifts downward, viscosity drops. If microbial contamination introduces hyaluronidase, depolymerization accelerates dramatically.

Most HA supplement manufacturers buy sodium hyaluronate from raw material suppliers, specify a concentration, and don't think about MW beyond what's on the supplier's certificate of analysis. They can't — they don't control the raw material production.

We can. Runxin produces sodium hyaluronate as a raw material — including nano HA, hydrolyzed HA, acetylated HA, cationic HA, and specific MW HA — using our own fermentation and purification process. When we formulate an HA oral liquid, we select the MW fraction from our own production line, verify it by gel permeation chromatography (GPC), and track it through the full stability protocol. The MW on your label isn't a supplier's estimate — it's a parameter we control from fermentation tank to finished product.

Our HA Raw Material Capability

This is where we're different from every other HA supplement contract manufacturer we've encountered: we produce HA raw materials in-house.

What this means for your product:

You're not limited to what's available from suppliers. Most HA supplement manufacturers offer 1–2 MW options because that's what their suppliers carry. We can produce any MW profile in our fermentation and purification process.

MW is verified at every stage. We test MW by GPC at raw material production, formulation, and finished product — and at 3, 6, and 12 months in our stability protocol. You'll know if your "50 kDa HA" is still 50 kDa after a year on the shelf.

Supply chain security. We don't depend on external HA suppliers who might change specifications, increase prices, or have stock shortages. Our HA production runs on the same campus as our supplement manufacturing.

Cost advantage. Eliminating the HA raw material supplier margin allows us to offer competitive pricing on HA liquids, particularly for brands that need custom MW profiles that would be expensive to source externally.

The Three Challenges of HA in Liquid Form

Challenge 1: Viscosity Control

HA's viscosity contribution is non-linear — it increases exponentially with concentration and molecular weight. This means small changes in either variable produce large changes in product texture and dispensing behavior.

Common mistake: Brands specify a high dosage (e.g., 200mg HA per serving) with a high MW (1,000 kDa) for a shot format. The resulting viscosity makes the product undrinkable. We help brands select the right MW and concentration for their target delivery format before formulation begins.

Challenge 2: Microbial Stability

HA is a polysaccharide — an excellent nutrient source for bacteria and fungi. In an aqueous liquid at neutral pH, microbial growth is a significant risk. The challenge is that many effective preservatives interact with HA's molecular structure, reducing viscosity or causing precipitation.

Our approach:

• Formulate at pH 3.5–4.5 (acidic conditions inhibit most microbial growth)
• Use gentle preservation systems compatible with HA (sodium benzoate + potassium sorbate at permitted levels)
• Hot-fill processing (75–85°C) for standard products; cold-fill with stricter aseptic protocols for premium formulations
• Microbial testing at 0, 3, 6, and 12 months (total plate count, yeast/mold, coliforms)

Challenge 3: MW Stability Over Shelf Life

HA in aqueous solution undergoes slow depolymerization through acid hydrolysis and free radical cleavage. The rate depends on pH, temperature, and the presence of metal ions or residual hyaluronidase activity.

Over 12–24 months, a high MW HA product (1,000 kDa) may show measurable reduction in average MW. If the MW drops significantly, viscosity decreases, and the product no longer matches its specification.

Our approach:

• pH optimization: Acidic carriers (pH 3.5–4.5) slow both microbial growth and acid hydrolysis simultaneously
• Chelating agents (EDTA or sodium phytate) to bind metal ions that catalyze free radical cleavage
• GPC testing at 0, 3, 6, and 12 months to track MW distribution
• Raw material enzyme inactivation verification (residual hyaluronidase <0.1 U/g)

Result: Across our HA liquid formulations, MW retention is ≥90% at 12 months (25°C/60% RH). We provide this data as part of production documentation.

Which HA Molecular Weight Is Right for Your Product?

Our recommendation: Don't choose MW based on what's cheapest or most available. Choose it based on your brand positioning and the clinical data you want to reference. Then tell us the MW you need — and we'll produce it.

Product Specifications

Customization Options

HA Molecular Weight: Nano (≤5 kDa), Hydrolyzed (≤10 kDa), Low MW (50–200 kDa), Medium MW (200–800 kDa), High MW (800–1,500 kDa), Custom blend (multi-MW "full spectrum")

Dosage: 20mg, 50mg, 100mg, 150mg, 200mg per serving — custom available

Flavor: Natural Citrus, Mixed Berry, Peach-Mango, Aloe-Cucumber, Custom development available

Sweetener: Stevia (Reb M), Sucralose, Monk Fruit, None (unsweetened)

Packaging: 10–25ml glass ampoules, 30–50ml PET/HDPE bottles, 30–60ml dropper bottles, 100–300ml bottles, Custom

Co-Ingredients: Collagen peptides, Glutathione, Vitamin C (AA2G), Biotin, Chondroitin sulfate — compatibility tested

Delivery Format: Ready-to-drink liquid, Concentrated shot, Drops, Syrup

Runxin vs. Market Standard

Real Project Example

A Korean beauty brand wanted an HA oral liquid positioned as "multi-depth hydration" — targeting skin, joints, and connective tissue simultaneously. Their previous manufacturer offered only one MW option (500 kDa) because that was the only grade their supplier carried. The resulting product was too viscous for a shot format and didn't align with any specific clinical data.

We proposed a triple-MW blend: 5 kDa nano HA (30% of total HA) for rapid absorption and skin deposition, 100 kDa low MW HA (40%) for moderate-depth hydration, and 800 kDa high MW HA (30%) for joint and connective tissue support. We produced all three MW fractions in-house, verified each by GPC, and formulated the blend at a total concentration of 100mg per 25ml shot — within the target viscosity range for ampoule dispensing.

The product launched in Q4 2025 and has been their top-selling SKU for two consecutive quarters. The brand has reordered three times and expanded from the Korean market to Japan and Taiwan.

Frequently Asked Questions

Q: What molecular weight HA should I choose for a beauty supplement?

A: For skin-focused beauty positioning, we recommend ≤10 kDa (hydrolyzed) or ≤5 kDa (nano) HA. These lower MW fractions show better intestinal absorption and are supported by clinical research on skin hydration. They also produce lower viscosity, which allows formulation as a shot or drops — the most popular formats in the beauty supplement market. If you're targeting "beauty + joint" dual positioning, a mid-range MW (50–200 kDa) or a multi-MW blend may be more appropriate.

Q: Can you make a "full spectrum" HA product with multiple molecular weights?

A: Yes — this is one of our strengths. Since we produce HA in-house, we can blend any combination of MW fractions in a single formulation. A common approach is a triple-MW blend targeting different tissue depths. We verify the MW distribution of each component and the final blend by GPC.

Q: Why does my HA liquid get thinner over time?

A: This is likely MW depolymerization — HA molecules break down into smaller fragments over shelf life, reducing viscosity. The causes include acid hydrolysis (if pH is too low), free radical cleavage (catalyzed by metal ions), or residual hyaluronidase activity from the raw material. We control all three factors: pH optimization, chelating agents, and enzyme inactivation verification. We also monitor MW by GPC at regular intervals.

Q: What's the difference between hyaluronic acid and sodium hyaluronate in supplements?

A: In dietary supplements, the ingredient is almost always sodium hyaluronate — the sodium salt of hyaluronic acid, which is more water-soluble and stable than the free acid form. "Hyaluronic acid" on the label typically refers to sodium hyaluronate. We use food-grade sodium hyaluronate produced in our own fermentation facility.

Q: How does your in-house HA production benefit my brand?

A: Three ways: (1) You can specify any MW profile rather than choosing from a supplier's catalog. (2) MW is verified at every production stage, not just on a raw material COA. (3) Supply chain is secure — we don't depend on external HA suppliers, so there are no stock shortages, specification changes, or price volatility from middlemen.

Q: What's the MOQ for custom HA oral liquid?

A: 2,000 bottles for standard formulations with existing MW profiles. 3,000 bottles for custom MW blends requiring new GPC verification and stability testing.

Q: What's the lead time?

A: Samples: 7–10 business days for standard formulations, 14–20 business days for custom MW blends. Bulk production: 20–25 business days after sample approval.

Ready to Start Your Hyaluronic Acid Liquid Project?

Most HA supplement brands don't think about molecular weight beyond the label. They specify a dosage, choose a flavor, and accept whatever HA their manufacturer's supplier provides. The result is a product that may not match the clinical data referenced in their marketing, may not deliver the targeted benefit, and may not even maintain its viscosity through shelf life.

We approach HA differently — because we produce it ourselves. From fermentation to finished product, every parameter is controlled and verified. If you want an HA oral liquid with a specific MW profile, verified stability, and a supply chain that can't be disrupted by external suppliers, we should talk.

Contact us today to discuss your project. Our team responds within 24 hours — and we'll ask about your target MW, not just your flavor preferences.