How are cosmetic products rated?

How are cosmetic products rated?

Mira rates cosmetics by their composition: the app breaks a product down into individual ingredients (by INCI) and analyses each one.

Based on current scientific data, every ingredient gets a level of risk to health and the environment. We look at several aspects: allergenicity, irritation, hormonal effects, cancer risk and harm to nature. For each ingredient the app shows its potential risks and the scientific sources behind the assessment.

A product's rating is a score with a colour band: "Excellent", "Good", "Poor" or "Bad".

The core principle: the riskiest ingredient sets the rating.

• A single high-risk ingredient pushes the product into the lowest band, "Bad", regardless of the rest of its composition.

• If the riskiest ingredient is of medium risk, the product can't rise above the lower-middle bands.

Other risky ingredients lower the rating further within that band. Short ingredient lists are judged more strictly: when there are few ingredients, a single problematic one makes up a larger share of the formula and weighs more on the result.

The rating is Mira's opinion. The words "Excellent", "Good", "Poor" and "Bad" refer to the rating, not to the product itself.