How to Check Cosmetics Ingredients: INCI, Comedogenicity, Basics

The packaging promises everything; the truth is in the ingredient list on the back. Learning to read it is more useful than trusting "natural" and "hypoallergenic" labels: the composition shows what is actually in the jar, at what concentration, and whether it suits your skin. Let's break down how to check cosmetics ingredients by INCI, what ingredient order means, what comedogenicity is, and which fears about "harmful ingredients" are exaggerated.

Why Check Cosmetics Ingredients

The composition (INCI) is the honest part of the packaging: it is regulated and cannot lie about what is inside. From it you can see:

• whether the product contains the claimed active ingredient and in what amount
• whether it contains something that does not suit you (fragrances, alcohol, allergens)
• whether it is just marketing ("with hyaluronic acid" in trace amounts)

This is the essence of our cosmetics matching by composition service: read the label and map it to your skin and goals.

How the INCI List Works: Ingredient Order

INCI (International Nomenclature of Cosmetic Ingredients) is a single international naming language. The key rule: ingredients are listed in descending order of concentration down to 1%. What matters:

• The first 5–6 positions are the base of the product (usually water, base oils, emollients)
• Ingredients below 1% may be listed in any order — so "actives" at the very end are often there in trace doses
• Fragrance (Parfum/Fragrance) and preservatives are usually at the end

Where the Active Ingredients Are and Where the Traces Are

If a heavily advertised active (for example, niacinamide or peptides) is at the very end, after the fragrance, there is likely a fraction of a percent and no "working" concentration. Useful actives for a visible effect should be high enough up. How specific actives work is covered in niacinamide: what it is for and acids for the face.

Comedogenicity: What It Is and Why Ratings Are Unreliable

Comedogenicity is an ingredient's ability to clog pores. But the popular "comedogenicity ratings from 0 to 5" are largely outdated: they are based on 1970s–80s experiments (rabbit ear tests), translate poorly to humans, and ignore that the outcome depends on the whole formula and concentration, not a single component. So "non-comedogenic" on a label is a marketing term with no strict legal standard. Only practice shows the real skin reaction. If skin is prone to clogging, see blackheads and enlarged pores and acne: causes.

"Harmful Ingredients" in Cosmetics: Myths and Reality

Many fears are exaggerated: parabens, silicones, and mineral oil in permitted concentrations are deemed safe by regulators (for example, EU 1223/2009). "Chemical" is not a synonym for harmful, and "natural" is not a synonym for safe (essential oils and extracts are frequent allergens). It is wiser to look not at scary lists but at whether the composition suits you specifically.

Composition Safety: What to Look For

• Fragrance allergens (the EU list of 26 allergens) — if your skin is reactive
• Alcohol (Alcohol Denat.) high in the list — can be drying
• Acids and retinoids — consider sun protection and pregnancy
• Period after opening (the PAO symbol) and storage conditions

How to Check Cosmetics for Your Skin (Checklist)

1. Read the first 5–6 ingredients — that is the base
2. Find the claimed actives and assess their position (high / at the tail)
3. Check for the undesirable for your skin (fragrances, alcohol, allergens)
4. Map it to your goal (hydration, acne, pigmentation, sensitivity)

Doing this automatically and accounting for your biology is helped by cosmetics matching by composition.

This information is for educational purposes and does not replace a specialist consultation.