Ingredient review
Homosalate
INCI: Homosalate
Homosalate is a common UVB sunscreen filter that is effective at preventing sunburn, but it has raised some environmental and potential endocrine concerns that are still being studied.
In plain English
Homosalate is a chemical sunscreen ingredient that absorbs ultraviolet B (UVB) rays from the sun, which are the main cause of sunburn. It works by turning UV light into a small amount of heat, which is then released from the skin. You'll find it in many sunscreens, often combined with other filters to provide broad-spectrum protection. While it's approved for use in many countries, some studies have suggested it may have mild hormone-like effects in the body, though the levels used in sunscreens are generally considered safe by regulators. There are also environmental concerns about its impact on marine life, which has led to restrictions in some places.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Homosalate 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 Homosalate.
- 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
Homosalate is a synthetic organic compound classified as a salicylate. It is an oil-soluble UVB filter that absorbs ultraviolet radiation in the 295–315 nanometer range.
How it works
When applied to the skin, homosalate absorbs UVB photons and converts them into heat energy, which then dissipates harmlessly. This prevents the UV radiation from penetrating the skin and causing DNA damage that leads to sunburn and long-term skin aging.
Pros
Effective UVB filter
Homosalate reliably absorbs UVB rays, helping to prevent sunburn when used as directed in a sunscreen formula.
Good formulation compatibility
It is oil-soluble and blends well with other sunscreen ingredients, making it easy to create cosmetically elegant, water-resistant sunscreens.
Cons and cautions
Potential endocrine concerns
Some animal studies have shown that high doses of homosalate can mimic estrogen, though human relevance at typical sunscreen levels is debated and considered low risk by regulators.
Environmental impact
Homosalate has been detected in water sources and may contribute to coral bleaching. Some regions, like Hawaii and Key West, have restricted its use to protect marine ecosystems.
Best for
- People looking for affordable, effective UVB protection
- Those who prefer chemical sunscreens over mineral ones
Use caution if
- Individuals with very sensitive or reactive skin (may cause mild irritation in some)
- Those seeking a reef-safe sunscreen (check local regulations)
Usage tips
Safety summary
Homosalate is considered safe for use in sunscreens at approved concentrations by major regulatory bodies, including the FDA and the European Commission. However, some studies have raised concerns about potential endocrine disruption and environmental harm. The overall risk to human health from typical sunscreen use is very low, but consumers may choose alternatives if they are concerned about these issues.
Research notes
Research on homosalate shows it is an effective UVB filter. Animal studies indicate possible endocrine activity at high doses, but human studies are limited. Environmental studies show it can be toxic to coral larvae. The FDA continues to review its safety profile.
Common label clues
- Typical concentration
- Up to 10% in the US, up to 10% in the EU, up to 10% in Japan
- Regulatory status
- Approved for use in sunscreens in the US (up to 10%), EU (up to 10%), Japan, and many other countries. The FDA has proposed that more safety data is needed to confirm GRASE (Generally Recognized as Safe and Effective) status, but it is still legally sold.
- Common uses
- Sunscreens, Moisturizers with SPF, Makeup with SPF
- Environmental note
- Homosalate has been found to accumulate in marine environments and may contribute to coral bleaching. Some regions have banned sunscreens containing it to protect reefs.
Good to know
- Homosalate is often combined with avobenzone to improve photostability.
- The FDA has requested more safety data on homosalate as part of its ongoing sunscreen ingredient review, but it remains approved for use in the US.
Common questions
What is Homosalate in beauty products?
Homosalate is a chemical sunscreen ingredient that absorbs ultraviolet B (UVB) rays from the sun, which are the main cause of sunburn. It works by turning UV light into a small amount of heat, which is then released from the skin. You'll find it in many sunscreens, often combined with other filters to provide broad-spectrum protection. While it's approved for use in many countries, some studies have suggested it may have mild hormone-like effects in the body, though the levels used in sunscreens are generally considered safe by regulators. There are also environmental concerns about its impact on marine life, which has led to restrictions in some places.
What does Homosalate do in a beauty product?
When applied to the skin, homosalate absorbs UVB photons and converts them into heat energy, which then dissipates harmlessly. This prevents the UV radiation from penetrating the skin and causing DNA damage that leads to sunburn and long-term skin aging.
Is Homosalate safe for most people?
Homosalate is considered safe for use in sunscreens at approved concentrations by major regulatory bodies, including the FDA and the European Commission. However, some studies have raised concerns about potential endocrine disruption and environmental harm. The overall risk to human health from typical sunscreen use is very low, but consumers may choose alternatives if they are concerned about these issues.
Who should be careful with Homosalate?
Individuals with very sensitive or reactive skin (may cause mild irritation in some) Those seeking a reef-safe sunscreen (check local regulations)
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.