Ingredient review
Sodium Scymnol Sulfate
INCI: Sodium Scymnol Sulfate
A mild, naturally derived surfactant that cleanses without stripping the skin barrier, but its shark origin raises sustainability concerns.
In plain English
Sodium Scymnol Sulfate is a gentle cleansing ingredient originally sourced from shark bile. It helps remove dirt and oil from your skin without causing the tight, dry feeling that harsher cleansers can leave behind. Think of it as a kinder alternative to sodium lauryl sulfate (SLS) for those with sensitive or dry skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium Scymnol Sulfate is generally a lower-concern ingredient when the full formula suits your skin.
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 Sodium Scymnol Sulfate.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
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
A sulfate-based surfactant derived from the bile of deep-sea sharks (genus Scymnus). It is chemically modified to be water-soluble and mild on skin.
How it works
It reduces the surface tension of water, allowing oil and dirt to be lifted away from the skin and rinsed off easily. Its molecular structure is larger and less penetrating than harsher sulfates, which minimizes irritation and moisture loss.
Pros
Extremely mild
Unlike SLS, it cleanses without disrupting the skin's moisture barrier, making it ideal for daily use on sensitive or dry skin.
Conditioning feel
It leaves skin feeling soft and hydrated after rinsing, reducing the need for heavy moisturizers.
Cons and cautions
Animal-derived
It is sourced from shark bile, which may conflict with vegan lifestyles and raises concerns about overfishing and sustainability.
Limited availability
It is less common than plant-based surfactants, so products containing it may be harder to find and more expensive.
Best for
- People with dry or sensitive skin
- Those looking for a mild, non-stripping cleanser
Use caution if
- Vegans or those avoiding animal-derived ingredients
- Environmentally conscious consumers concerned about shark harvesting
Usage tips
Safety summary
Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. The main concern is ethical sourcing rather than skin safety.
Research notes
Limited peer-reviewed studies exist specifically on Sodium Scymnol Sulfate. Most evidence comes from cosmetic ingredient safety reviews and anecdotal formulation data. It is generally regarded as a mild surfactant.
Common label clues
- Typical concentration
- 0.5–3% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general surfactant safety guidelines.
- Common uses
- Facial cleansers, Body washes, Shampoos
- Environmental note
- Sourcing from deep-sea sharks raises sustainability concerns. Look for brands that use certified sustainable harvesting or consider plant-based alternatives.
Good to know
- Sodium Scymnol Sulfate is sometimes listed as 'Sodium Scymnol Sulphate' on European labels.
- It is not the same as SLS (sodium lauryl sulfate) — it is much milder and less likely to cause irritation.
Common questions
What is Sodium Scymnol Sulfate in beauty products?
Sodium Scymnol Sulfate is a gentle cleansing ingredient originally sourced from shark bile. It helps remove dirt and oil from your skin without causing the tight, dry feeling that harsher cleansers can leave behind. Think of it as a kinder alternative to sodium lauryl sulfate (SLS) for those with sensitive or dry skin.
What does Sodium Scymnol Sulfate do in a beauty product?
It reduces the surface tension of water, allowing oil and dirt to be lifted away from the skin and rinsed off easily. Its molecular structure is larger and less penetrating than harsher sulfates, which minimizes irritation and moisture loss.
Is Sodium Scymnol Sulfate safe for most people?
Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. The main concern is ethical sourcing rather than skin safety.
Who should be careful with Sodium Scymnol Sulfate?
Vegans or those avoiding animal-derived ingredients Environmentally conscious consumers concerned about shark harvesting
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.