Question 1

What does Homosalate 6.5% do in a cosmetic formula?

Accepted Answer

This ingredient is an oil-soluble organic UV filter used primarily to absorb UVB light and contribute to SPF in sunscreen and daily-wear SPF formulas. At 6.5%, it is functioning as an active sunscreen filter rather than a supporting cosmetic additive.

Question 2

Is Homosalate 6.5% clean?

Accepted Answer

This ingredient has significant clean-standard friction because endocrine-activity questions and changing regulatory concentration limits have led many retailer standards and brand policies to restrict it. Irritation is usually not the central issue, but the safety debate keeps it from a low-concern profile.

Question 3

Is Homosalate 6.5% sustainable?

Accepted Answer

This material is synthetic and generally tied to petrochemical feedstocks rather than renewable sourcing. It is oil soluble, not readily biodegradable, and is monitored for aquatic persistence and bioaccumulation potential.

Question 4

Is Homosalate 6.5% COSMOS-approved?

Accepted Answer

This ingredient is not permitted under COSMOS-natural or COSMOS-organic certification for sunscreen active use. Its petrochemical sourcing, limited biodegradability, and aquatic persistence concerns make it a weak fit with Green Chemistry priorities.

Question 5

How does Homosalate 6.5% work chemically?

Accepted Answer

The molecule is a bulky aromatic ester with high oil solubility and UVB absorption, with peak performance in the roughly 295 to 315 nm range. At 6.5%, it sits below the U.S. 15% sunscreen monograph ceiling and within current EU face-product limits, but it gives limited UVA coverage and is usually paired with other filters for broad-spectrum performance.