Science
Mechanism of Action
Hyaluronidase operates as an enzyme, catalyzing the hydrolysis of β-1,4 glycosidic linkages within hyaluronic acid (HA). This enzymatic action effectively diminishes the viscosity of hyaluronan found in the extracellular matrix, consequently increasing tissue permeability and facilitating the widespread dispersion and absorption of other injected compounds.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Demonstrated effectiveness for the removal of uncomplicated hyaluronic acid (HA) filler nodules on the forearm, upper arm, or back skin with single injections of 1.25-37.5 units per 0.1 mL of HA filler.
- 02 Showed efficacy for removing uncomplicated HA filler nodules on the forearm, upper arm, or back skin when administered as 3 consecutive weekly injections of 0.375-2.25 units per 0.1 mL of HA filler.
- 03 Effective for dissolving hyaluronic acid fillers located in the vicinity of a blood vessel, with recommendations of 100 IU or more per site for a clear effect (based on animal tests).
- 04 Typical dosages for managing complications associated with HA dermal fillers range from 450-1500 IU, adjusted based on the severity of the complication.
- 05 A concentration of not less than 1,500 units in 5mL is a recommended guideline by the CMAC board for dissolving HA filler.
Transparency
Dusting Analysis
Hyaluronidase's primary documented efficacy is for injectable applications in a medical context, specifically for dissolving hyaluronic acid fillers. There is no established topical concentration range for conventional cosmetic benefits, nor evidence to suggest it is commonly 'dusted' as an active ingredient in typical skincare formulations for widespread claims.
The Formula
Formulation
Stability
Hyaluronidase enzyme activity is highly pH sensitive, with optimal efficacy for dermal filler dissolution observed between pH 6.5 and 7.5. Activity is significantly reduced outside this range due to enzyme denaturation. Bovine/ovine derived hyaluronidase may exhibit bimodal activity at pH 4.5 and 7.5, while some acid-active forms are optimal at pH 3-4. For long-term quality, storage at cool temperatures (2–8°C) is recommended, though stability at room temperature (25°C) is guaranteed for 12 months. Ampoules, once opened, require immediate use, and any unused contents should be discarded.
Conflicts
- Anti-inflammatory agents (e.g., indomethacin, dexamethasone, salicylates)
- Plant-based compounds (e.g., flavonoids, antioxidants)
- Antihistamines
- Mast cell stabilizers
- Heparin
- Vitamin C
- Dicoumarol
- Radiographic contrast media
- Botulinum toxin (should not be used in the same area within 48 hours due to potential spreading effects)
- Infected skin (unless the clinical benefits demonstrably outweigh the risks)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not explicitly assessed hyaluronidase as a topical cosmetic ingredient. The FDA has approved it for specific medical injectable indications, but its use for dissolving HA fillers is often considered 'off-label.' While local adverse events and allergic reactions from injections are rare (0.05% to 0.69%), severe reactions such as urticaria and angioedema have been reported in less than 0.1% of cases. The risk of allergic reactions increases significantly with higher doses (e.g., over 100,000 IU intravenously). A heightened risk of allergic reaction is noted for individuals with a history of wasp or bee sting allergies.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While hyaluronidase exhibits a clear and potent mechanism for breaking down hyaluronic acid through injectable applications, substantial clinical evidence for its efficacy in typical topical skincare benefits is currently insufficient, requiring further research for this application.
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