How does Mira calculate cosmetic product scores?

A cosmetic's rating in Mira is built from the potential impact of its ingredients on your health and the environment. Each ingredient in the formula is assigned a risk level, and these assessments combine into a final score with a colour band: 'Excellent', 'Good', 'Poor' or 'Bad'.

The riskiest ingredient sets the band

The core principle is straightforward: the ingredient with the highest risk level determines the band.

• If the formula contains a high-risk ingredient, the product drops to the lowest band, 'Bad', regardless of the rest of its composition.

• If the riskiest ingredient is only of medium risk, the product cannot rise above the lower-middle bands.

• If the formula holds only safe and low-risk ingredients, the product stays in the upper bands, 'Good' or 'Excellent'.

The other ingredients matter too

Within that band, every risky ingredient lowers the score further, the more so the higher its risk and the more serious its potential harm. Mira looks at several dimensions: cancer risk, endocrine disruption, allergenicity, irritation and pollution. When a single ingredient carries more than one type of risk, the highest one is applied.

Short ingredient lists are judged more strictly

When a product has only a few ingredients, a single problematic one makes up a larger share of the formula, so in short compositions a risky ingredient weighs more heavily and pulls the score down harder.

Inside the app, each ingredient shows its potential risks along with the scientific sources behind the assessment.

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