Ingredient review
Dibenzothiophene
INCI: DIBENZOTHIOPHENE
Dibenzothiophene is a synthetic UV filter with limited safety data; it is not widely used in mainstream skincare and may cause irritation for sensitive skin.
In plain English
Dibenzothiophene is a man-made chemical that can absorb ultraviolet (UV) light, which is why it's sometimes added to sunscreens or other products to help protect your skin from the sun. However, it's not a common ingredient in most skincare products, and there isn't a lot of research on how safe it is for everyday use on skin. Some studies suggest it might cause irritation or other reactions, so it's generally used in very small amounts.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is still emerging, so marketing claims deserve extra caution.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Dibenzothiophene 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 Dibenzothiophene.
- 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
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
Dibenzothiophene is a synthetic organic compound composed of two benzene rings fused to a central sulfur-containing ring. It belongs to a class of compounds known as thiophenes, which are sometimes used in cosmetics for their UV-absorbing properties.
How it works
In cosmetic products, dibenzothiophene works by absorbing ultraviolet (UV) radiation, particularly in the UVB range. This helps prevent UV rays from penetrating the skin and causing damage like sunburn or premature aging. It may also act as a stabilizer for other UV filters, helping them last longer on the skin.
Pros
UV protection
Helps absorb UVB rays, reducing the risk of sunburn and skin damage when used in sunscreens.
Stabilizing effect
Can help other UV filters remain effective longer on the skin, improving overall product performance.
Cons and cautions
Limited research
There is not enough scientific evidence to fully confirm its safety for regular cosmetic use, which may concern cautious consumers.
Potential irritation
Some users may experience redness, itching, or stinging, especially if they have sensitive skin or allergies to synthetic compounds.
Best for
- People looking for additional UV protection in sunscreens
- Those with normal skin types who tolerate synthetic filters well
Use caution if
- Individuals with sensitive or reactive skin
- Anyone concerned about using ingredients with limited long-term safety data
Usage tips
Safety summary
Dibenzothiophene has limited safety data for cosmetic use. It may cause skin irritation in sensitive individuals and is not recommended for those with allergies to synthetic UV filters. More research is needed to confirm its long-term safety.
Research notes
Most available research on dibenzothiophene focuses on its industrial applications rather than cosmetic safety. A few studies suggest potential for skin irritation, but no large-scale human trials have been conducted for skincare use.
Common label clues
- Typical concentration
- Typically used at very low concentrations (under 1%)
- Regulatory status
- Dibenzothiophene is not specifically listed as a restricted or prohibited cosmetic ingredient by major regulators like the FDA or EU CosIng, but its use is not widespread and safety data is limited.
- Common uses
- Sunscreens, Anti-aging products
- Environmental note
- Dibenzothiophene is a synthetic compound that may persist in the environment; its ecological impact from cosmetic use is not well studied.
Good to know
- Dibenzothiophene is not a common ingredient in most commercial sunscreens; it appears more often in experimental or niche formulations.
- This compound is also studied in other industries, such as fuel desulfurization, which may raise environmental concerns.
Common questions
What is Dibenzothiophene in beauty products?
Dibenzothiophene is a man-made chemical that can absorb ultraviolet (UV) light, which is why it's sometimes added to sunscreens or other products to help protect your skin from the sun. However, it's not a common ingredient in most skincare products, and there isn't a lot of research on how safe it is for everyday use on skin. Some studies suggest it might cause irritation or other reactions, so it's generally used in very small amounts.
What does Dibenzothiophene do in a beauty product?
In cosmetic products, dibenzothiophene works by absorbing ultraviolet (UV) radiation, particularly in the UVB range. This helps prevent UV rays from penetrating the skin and causing damage like sunburn or premature aging. It may also act as a stabilizer for other UV filters, helping them last longer on the skin.
Is Dibenzothiophene safe for most people?
Dibenzothiophene has limited safety data for cosmetic use. It may cause skin irritation in sensitive individuals and is not recommended for those with allergies to synthetic UV filters. More research is needed to confirm its long-term safety.
Who should be careful with Dibenzothiophene?
Individuals with sensitive or reactive skin Anyone concerned about using ingredients with limited long-term safety data
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.