Sulfur in Cosmetics: Properties, Effects, and Formulations
Short Answer/Definition:
Sulfur is an elemental active ingredient primarily used in cosmetic products for oily, blemished, or acne-prone skin.
In cosmetic formulations, it is usually used as colloidal sulfur or sulfur.
The active ingredient possesses keratolytic, antimicrobial, and sebum-regulating properties.
Typical concentrations in cosmetic products range from 1% to 10%, depending on the product type and regulatory assessment.
What is sulfur from a physicochemical perspective?
Sulfur is a chemical element with atomic number 16 and belongs to the group of chalcogens.
Physicochemical properties
| Parameter | Description |
|---|---|
| Chemical symbol | S |
| Molecular structure | usually cyclic S₈ |
| Molecular weight | 256.52 g/mol (S₈) |
| INCI | Sulfur / Colloidal Sulfur |
| Solubility | practically insoluble in water |
| Color | Yellow |
| Odor | Characteristic sulfuric |
In cosmetic formulations, the active ingredient is usually used as a micronized or colloidal dispersion to enable uniform distribution in creams, masks, or lotions.
What effect does sulfur have on the skin?
Sulfur has keratolytic, sebum-regulating, and antimicrobial effects.
Primary cosmetic effects:
- Promotes exfoliation of the stratum corneum
- Reduces excess sebum production
- Inhibits certain skin-related microorganisms
- Supports skin renewal
These properties make the active ingredient particularly suitable for products targeting blemished skin.
Why is sulfur used for acne and oily skin?
The active ingredient can influence sebum production as well as regulate skin keratinization.
Relevant effects:
- Reduction of hair follicle blockage
- Support of keratin exfoliation
- Improvement of the appearance of comedones
Cosmetically, the active ingredient is therefore frequently used in acne masks, spot treatments, and cleansing systems.
Which cosmetic products contain sulfur?
The active ingredient is primarily used in products for problematic skin.
Typical applications:
- Facial cleansers for blemished skin
- Anti-acne masks
- Spot treatments
- Medically inspired skincare
- Scalp care for seborrheic skin
The required concentration depends heavily on the product concept.
What are the challenges of formulating with sulfur?
Sulfur is poorly soluble and can cause sensory issues.
Typical challenges:
- limited solubility
- sedimenting particles
- distinctive odor
- potential skin dryness at high dosages
Practical guide for developers:
- Use as a colloidal dispersion
- Stabilization using suitable emulsifiers
- Particle size control
- Sensory masking through formulation systems
- Stability testing over 12–24 months
These aspects are crucial for stable cosmetic formulations.
How is sulfur classified under EU regulations?
Sulfur is permitted for cosmetic use in the EU.
Regulatory Key Points:
- INCI: Sulfur / Colloidal Sulfur
- Use depends on product category and safety assessment
- Assessment required in the Cosmetic Product Safety Report (CPSR)
The following points in particular must be assessed in the CPSR:
- Concentration in the final product
- Exposure
- Possible skin irritations
What scientific evidence of efficacy is available?
Dermatological studies show that sulfur can have a beneficial effect on blemished skin.
Effects described in studies:
- Reduction of acne lesions
- Improvement of skin texture
- Antimicrobial effect against acne-causing bacteria
Studies also report keratolytic effects that can help resolve keratinization disorders.
Conclusion: Sulfur
For rapid market entry, Tojo Cosmetics offers EU-compliant white-label products that have already been developed for problematic skin.
For custom formulations, Cosactive offers formulation-tested active ingredients and functional raw materials starting at low usage levels.
When developing products with sulfur, stability, particle size, and skin compatibility should be tested in particular. For custom formulation development, feel free to contact Cosmacon — we’ll advise you free of charge!
FAQ
What is sulfur in cosmetics?
Sulfur is a keratolytic and sebum-regulating active ingredient frequently used in products for blemish-prone skin.
What effect does sulfur have on the skin?
It can reduce excess sebum, support skin exfoliation, and have an antimicrobial effect.
Is sulfur suitable for acne?
Yes, the active ingredient is traditionally used in cosmetic products for acne-prone skin.
Is sulfur permitted in the EU?
Yes, the active ingredient is permitted in cosmetics provided a safety assessment is conducted in the CPSR.
What concentrations are used?
Typical concentrations range from 1% to 10%.
Why is sulfur difficult to formulate?
It is poorly soluble in water and can cause sensory challenges.
Does every product containing sulfur require its own safety assessment (CPSR)?
Yes, since every cosmetic formulation requires its own safety assessment.
References
- Del Rosso JQ.
Topical sulfur in dermatology.
https://pubmed.ncbi.nlm.nih.gov/15748577/ - Kircik LH.
The role of sulfur in dermatology.
https://pubmed.ncbi.nlm.nih.gov/20677523/ - Gupta AK et al.
Topical treatments for acne vulgaris.
https://pubmed.ncbi.nlm.nih.gov/21393982/ - Plewig G.
Acne therapy and keratolytic agents.
https://pubmed.ncbi.nlm.nih.gov/18488574/