| Oligomeric / Ultra-Low MW | Below 10 kDa | Very low solution viscosity; fast diffusion in aqueous systems; generally selected for lightweight sensory profiles. | Advanced topical serums, research formulations, specialty skin-care systems. | 0.01%–0.20% | Confirm molecular-weight test method, purity, endotoxin status, and suitability for the intended regulatory category. |
| Very Low MW | 10–50 kDa | Low viscosity and good spreadability; contributes to water-binding without a heavy surface film. | Facial serums, eye-area products, hydrating gels, leave-on personal-care formulations. | 0.05%–0.50% | Useful when rapid dissolution and a non-tacky finish are priorities; verify residual solvents and microbiological quality. |
| Low MW | 50–300 kDa | Low-to-moderate viscosity; balanced hydration, spreadability, and formulation flexibility. | Daily moisturizers, lotions, masks, hair-care products, and water-based gels. | 0.05%–0.50% | A practical choice for multi-product portfolios; request viscosity data at a stated concentration, temperature, and shear condition. |
| Medium MW | 300–800 kDa | Moderate viscosity and stronger water-retention film; supports a noticeable but manageable skin feel. | Creams, emulsions, hydrating gels, scalp-care products, and topical barrier-support formulations. | 0.05%–0.30% | Check hydration time, dispersion procedure, rheology, and compatibility with salts, preservatives, and surfactants. |
| High MW | 800–1,500 kDa | Higher solution viscosity, strong film-forming behavior, and prolonged surface hydration. | Rich creams, protective gels, professional skin-care products, and selected ophthalmic or medical formulations. | 0.01%–0.20% | For medical or ophthalmic use, require the applicable pharmacopoeial specification, sterility or bioburden controls, and end-use documentation. |
| Very High MW | 1,500–3,000 kDa | High viscosity and robust viscoelastic film; generally provides strong lubrication and surface protection. | Specialty medical devices, ophthalmic lubricating systems, wound-care products, and high-viscosity topical gels. | 0.01%–0.15% | Confirm sterile-grade capability where required, endotoxin limits, osmolality compatibility, and viscosity after sterilization. |
| Cross-Linked Sodium Hyaluronate | Network-dependent; often reported by gel properties rather than a single MW | Three-dimensional gel network with increased residence, elasticity, and resistance to dilution compared with linear material. | Specialty medical devices, injectable gel systems, tissue-engineering research, and long-lasting topical gel technologies. | Product-specific | Evaluate degree of cross-linking, particle or gel size, swelling ratio, residual cross-linker, sterility, and intended-use authorization. |
| Multi-MW Blend | Two or more defined MW fractions | Combines rapid spreading with higher-MW film formation; final rheology depends on blend ratio and total concentration. | Broad-spectrum skin-care products, hydrating masks, lotions, gels, and customized formulation platforms. | 0.05%–0.50% | Request the fraction distribution, weighted-average MW, polydispersity information, and complete formulation-grade specifications. |