Ingredient review
Hyaluronidase
INCI: Hyaluronidase
Hyaluronidase is an enzyme that breaks down hyaluronic acid in the skin, which can temporarily increase ingredient absorption but also risks irritation and moisture loss.
In plain English
Hyaluronidase is an enzyme that acts like tiny scissors, cutting apart hyaluronic acid molecules in your skin. Hyaluronic acid is a natural substance that holds water and keeps skin plump. By breaking it down, hyaluronidase temporarily loosens the skin's structure, allowing other ingredients to penetrate deeper. However, this also means your skin may lose some of its natural moisture-holding ability for a short time, so it's important to use it carefully and follow with hydrating products.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- biotech
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Hyaluronidase can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Hyaluronidase.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Hyaluronidase is a naturally occurring enzyme found in many organisms, including humans, that specifically breaks down hyaluronic acid. In skincare, it is typically produced through biotechnology (fermentation) and used at very low concentrations to temporarily modify the skin's barrier.
How it works
When applied to the skin, hyaluronidase cleaves the bonds in hyaluronic acid molecules, reducing their size and viscosity. This temporarily disrupts the skin's extracellular matrix, making it more permeable to other active ingredients. The effect is reversible, as the skin naturally produces new hyaluronic acid over time.
Pros
Boosts ingredient absorption
By temporarily loosening the skin's structure, hyaluronidase can help other active ingredients like vitamin C or peptides penetrate deeper, potentially increasing their effectiveness.
Temporary and reversible effect
The breakdown of hyaluronic acid is not permanent; your skin naturally replenishes it within hours to days, so the effect is short-lived and controllable.
Cons and cautions
Risk of moisture loss
Because it breaks down hyaluronic acid, which holds water, hyaluronidase can temporarily reduce your skin's hydration levels, leading to dryness or tightness if not paired with moisturizers.
Potential for irritation
The increased permeability can allow irritating ingredients to penetrate more deeply, raising the risk of redness, stinging, or allergic reactions, especially in sensitive skin.
Best for
- People with resilient, non-sensitive skin looking to boost ingredient absorption
- Those using professional treatments under dermatologist guidance
Use caution if
- Individuals with sensitive, reactive, or damaged skin
- Anyone with active inflammation, rosacea, or eczema
Usage tips
Safety summary
Hyaluronidase is considered safe for cosmetic use at low concentrations in well-formulated products, but it carries a moderate risk of irritation and temporary moisture loss. It is not recommended for sensitive or compromised skin, and should be used with caution alongside other active ingredients.
Research notes
Studies show hyaluronidase effectively increases skin permeability, but most evidence comes from in vitro or animal models. Human studies are limited, and long-term safety data for cosmetic use is sparse. The ingredient is well-documented in medical contexts for dissolving fillers.
Common label clues
- Typical concentration
- Very low (typically 0.01–0.1%)
- Regulatory status
- Approved as a cosmetic ingredient in many regions, but concentration limits may apply. Not approved for use in leave-on products in some countries due to safety concerns.
- Common uses
- Serums, Treatments, Professional peels
- Environmental note
- Produced via biotechnology (fermentation), which is generally more sustainable than animal-derived sources, but manufacturing energy use should be considered.
Good to know
- Hyaluronidase is sometimes used in medical settings to dissolve hyaluronic acid fillers, but in skincare it's used at much lower concentrations.
- The effect is temporary, lasting from a few hours to a day, after which the skin returns to normal.
Common questions
What is Hyaluronidase in beauty products?
Hyaluronidase is an enzyme that acts like tiny scissors, cutting apart hyaluronic acid molecules in your skin. Hyaluronic acid is a natural substance that holds water and keeps skin plump. By breaking it down, hyaluronidase temporarily loosens the skin's structure, allowing other ingredients to penetrate deeper. However, this also means your skin may lose some of its natural moisture-holding ability for a short time, so it's important to use it carefully and follow with hydrating products.
What does Hyaluronidase do in a beauty product?
When applied to the skin, hyaluronidase cleaves the bonds in hyaluronic acid molecules, reducing their size and viscosity. This temporarily disrupts the skin's extracellular matrix, making it more permeable to other active ingredients. The effect is reversible, as the skin naturally produces new hyaluronic acid over time.
Is Hyaluronidase safe for most people?
Hyaluronidase is considered safe for cosmetic use at low concentrations in well-formulated products, but it carries a moderate risk of irritation and temporary moisture loss. It is not recommended for sensitive or compromised skin, and should be used with caution alongside other active ingredients.
Who should be careful with Hyaluronidase?
Individuals with sensitive, reactive, or damaged skin Anyone with active inflammation, rosacea, or eczema
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.