Question 1

What does Homosalate: 9.0% do in a cosmetic formula?

Accepted Answer

This ingredient is an oil-soluble UVB filter used to raise SPF in sunscreen and daily-care formulas. It mainly covers the UVB range, so formulators pair it with UVA filters for broad-spectrum protection.

Question 2

Is Homosalate: 9.0% clean?

Accepted Answer

From a clean-beauty standpoint, this ingredient has high friction: it appears on many restricted or exclusion lists because of endocrine-activity questions, systemic absorption findings, and tightening concentration limits. At 9.0%, it exceeds the current EU maximum for finished sunscreen products, although U.S. rules have historically allowed higher levels.

Question 3

Is Homosalate: 9.0% sustainable?

Accepted Answer

This material is synthetically made, generally from petrochemical feedstocks, rather than obtained from renewable cosmetic raw materials. Its hydrophobic profile and limited biodegradability create persistence and aquatic-bioaccumulation concerns.

Question 4

Is Homosalate: 9.0% COSMOS-approved?

Accepted Answer

It is not permitted under COSMOS Organic or COSMOS Natural formulas as a conventional synthetic UV filter. Its Green Chemistry fit is weak because it relies on nonrenewable feedstocks and has persistence concerns.

Question 5

How does Homosalate: 9.0% work chemically?

Accepted Answer

The molecule is a lipophilic ester built around an aromatic UVB-absorbing chromophore, which gives it good oil-phase compatibility and little meaningful UVA coverage. In the U.S. it has historically been used up to 15%, while the EU moved to a 7.34% maximum in finished sunscreen products after a margin-of-safety reassessment.