Ingredient review
SD Alcohol 38-B
INCI: SD Alcohol 38-B
SD Alcohol 38-B is a fast-evaporating solvent that can help products feel lightweight but may be drying or irritating for sensitive skin.
In plain English
SD Alcohol 38-B is a type of denatured alcohol, meaning ethanol that has been treated with additives to make it undrinkable. In skincare, it helps other ingredients dissolve, gives a quick-drying feel, and can temporarily tighten pores. However, it can strip the skin's natural oils, leading to dryness or irritation, especially for those with sensitive or dry skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is relatively strong for its common cosmetic role.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- strong
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
SD Alcohol 38-B 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 SD Alcohol 38-B.
- 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
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
SD Alcohol 38-B is a denatured alcohol, specifically ethanol with denaturants added to prevent consumption. It is commonly used in cosmetics as a solvent and antimicrobial agent.
How it works
It evaporates quickly from the skin, creating a cooling sensation and helping other ingredients penetrate. It also has antimicrobial properties that can reduce surface bacteria, which is why it's often used in acne products.
Pros
Fast evaporation
Leaves a non-greasy, matte finish that many with oily skin appreciate.
Antimicrobial action
Helps reduce surface bacteria, which can be beneficial for acne-prone skin when used in appropriate formulations.
Cons and cautions
Drying effect
Repeated use can strip the skin of its natural moisture barrier, leading to increased dryness and irritation.
Irritation potential
May cause stinging, redness, or peeling, especially for those with sensitive skin or conditions like eczema.
Best for
- People with oily or acne-prone skin looking for a lightweight, fast-drying formula
- Those who tolerate alcohol well and want a refreshing toner
Use caution if
- Individuals with dry, sensitive, or eczema-prone skin
- Anyone with a compromised skin barrier or rosacea
Usage tips
Safety summary
Generally safe for most skin types when used in moderation, but can cause dryness and irritation in sensitive individuals. Avoid prolonged contact with eyes and mucous membranes.
Research notes
Studies confirm that denatured alcohol can disrupt the skin barrier with repeated use, but it remains effective as a solvent and antimicrobial in controlled concentrations.
Common label clues
- Typical concentration
- 1% to 50% depending on product type
- Regulatory status
- Approved for use in cosmetics in the US and EU, with concentration limits to ensure safety. Always follow product instructions.
- Common uses
- Toners, Cleansers, Acne treatments, Fragrance
- Environmental note
- Denatured alcohol is derived from ethanol, which can be sourced from corn or sugarcane. Its production has a moderate environmental footprint.
Good to know
- SD Alcohol 38-B is one of several denatured alcohol variants; the '38-B' refers to a specific denaturing formula.
- In the EU, denatured alcohol is regulated under cosmetic safety standards, but concentrations vary by product.
Common questions
What is SD Alcohol 38-B in beauty products?
SD Alcohol 38-B is a type of denatured alcohol, meaning ethanol that has been treated with additives to make it undrinkable. In skincare, it helps other ingredients dissolve, gives a quick-drying feel, and can temporarily tighten pores. However, it can strip the skin's natural oils, leading to dryness or irritation, especially for those with sensitive or dry skin.
What does SD Alcohol 38-B do in a beauty product?
It evaporates quickly from the skin, creating a cooling sensation and helping other ingredients penetrate. It also has antimicrobial properties that can reduce surface bacteria, which is why it's often used in acne products.
Is SD Alcohol 38-B safe for most people?
Generally safe for most skin types when used in moderation, but can cause dryness and irritation in sensitive individuals. Avoid prolonged contact with eyes and mucous membranes.
Who should be careful with SD Alcohol 38-B?
Individuals with dry, sensitive, or eczema-prone skin Anyone with a compromised skin barrier or rosacea
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.