Question 1

What does Homosalate 0.5% do in a cosmetic formula?

Accepted Answer

This ingredient functions as an oil-soluble UVB sunscreen filter, helping a formula absorb sunburn-range ultraviolet light and support SPF.

Question 2

Is Homosalate 0.5% clean?

Accepted Answer

Clean-beauty programs often flag this ingredient because it is a synthetic UV filter with endocrine-activity questions and tightening regulatory limits in some regions. Skin irritation is not its main issue, but clean-standard friction is significant.

Question 3

Is Homosalate 0.5% sustainable?

Accepted Answer

This ingredient is synthetically produced from petrochemical-derived inputs and is not a strong fit for renewable-sourcing goals. Its low water solubility and high lipophilicity raise persistence and bioaccumulation concerns in aquatic settings.

Question 4

Is Homosalate 0.5% COSMOS-approved?

Accepted Answer

It is not permitted under COSMOS-natural or COSMOS-organic sunscreen criteria, which favor mineral UV filters and approved nature-derived materials. From a Green Chemistry view, the petrochemical feedstock profile and environmental persistence concerns make alignment weak.

Question 5

How does Homosalate 0.5% work chemically?

Accepted Answer

The molecule is an oil-soluble aromatic ester with a bulky cyclohexyl group, absorbing primarily in the UVB range around 295 to 315 nm and contributing little UVA coverage. It is used at 0.5% here, below historical regulatory caps such as 15% in the U.S., and it is typically paired with other UV filters because it is a relatively weak absorber on its own.