SKIN ATLAS · INGREDIENTS · 5 MIN. READ

Cosmetic Ingredients: Effects, INCI List & Skin Compatibility

Cosmetic ingredients determine how a skincare product affects the skin, how it feels, and how well it is tolerated. Understanding the INCI list allows for conscious and informed decisions about one's skin.

What are cosmetic ingredients?

Cosmetic ingredients (also called ingredients) are all chemical, botanical, or biotechnological substances contained in skincare products. They determine the efficacy, texture, shelf life, and tolerability of a product. In the European Union, all substances are declared on the packaging according to the INCI system (International Nomenclature of Cosmetic Ingredients), as documented on Wikipedia.

All permissible substances are listed in the European Commission's Cosmetic Ingredient Database (CosIng). Cosmetics are subject to the EU Cosmetics Regulation (EC) No. 1223/2009, which regulates which substances are permitted, restricted, or prohibited – documented by the Federal Office of Consumer Protection and Food Safety.

How cosmetic ingredients affect the skin

Active ingredients interact with the skin barrier, the microbiome, and cell regeneration. According to a review in Springer Medizin, targeted combinations of peptides, antioxidants, and humectants can synergistically affect skin regeneration. The effect of an ingredient depends crucially on its concentration, the formulation, and the pH value of the product.

Commonly used active substances include hyaluronic acid for moisture retention, niacinamide for regulating the skin's appearance, and retinol for supporting cell renewal.

Categories and effects of cosmetic ingredients

• Active ingredients: active substances such as hyaluronic acid, niacinamide, or retinol that specifically target skin functions.
• Excipients: solvents like water, alcohol, or glycerin, which form the basis of the formulation.
• Conditioning agents: lipids, ceramides, or oils that support the skin barrier.
• Preservatives: prevent microbial growth and extend shelf life.
• Emulsifiers: combine water and oil phases in creams and lotions.
• Fragrances and colorants: improve sensory properties, but can be irritating to sensitive skin.

Application and compatibility

Every cosmetic ingredient must undergo a safety assessment before it can be used in a product:

• Toxicological testing: assessment of skin compatibility and potential sensitization.
• Dermatological tests: checking for irritation potential, e.g., via patch test.
• Stability tests: investigation of active ingredient stability over the product lifecycle.
• Microbiological tests: safety against germs and contamination.

Animal testing for cosmetics has been completely banned in the EU since 2013, as Wikipedia states. The EU prohibits or restricts over 1,300 substances, including certain formaldehyde releasers, parabens, and phthalates. Allergenic fragrances such as Linalool, Citral, or Geraniol must be declared above a certain concentration, as explained by the Federal Institute for Risk Assessment.

Combination of ingredients

Natural and synthetic ingredients are not mutually exclusive – purity and stability are crucial:

• Natural ingredients: plant extracts, essential oils, or minerals. Rich in secondary plant compounds, but can trigger allergies.
• Synthetic ingredients: manufactured in the lab, often more stable and precisely dosable.
• Biotechnological ingredients: created through fermentation processes and combine natural origin with modern research, e.g., bioactive peptides.

Who are high-quality ingredients suitable for?

Anyone who wants to consciously care for their skin benefits from products with clearly declared, scientifically tested ingredients – regardless of skin type. Particularly relevant for:

• Sensitive or allergy-prone skin: as few, well-tested ingredients as possible.
• Mature skin: peptides, antioxidants, hyaluronic acid.
• Blemish-prone skin: niacinamide, salicylic acid.
• Anyone who wants to independently read and understand INCI lists.

Short, clear ingredient lists focusing on active ingredients – without declarable fragrances or aggressive preservatives – are a reliable quality feature.

Frequently asked questions about cosmetic ingredients

Which cosmetic ingredients are particularly effective for skincare?

The most effective substances include hyaluronic acid (moisture), niacinamide (evenness), retinol (cell renewal), and peptides (skin structure). The key factor is not just the active ingredient itself, but its concentration and the overall formulation of the product.

How do I identify questionable ingredients on the packaging?

By reading the INCI list, critical substances can be identified. The EU prohibits or restricts over 1,300 substances. Allergenic fragrances must be explicitly declared above certain concentrations. Databases like CosIng or EWG Skin Deep assist in classifying individual ingredients.

Can natural ingredients trigger allergies?

Yes. Even natural substances such as plant extracts or essential oils can cause allergies or skin irritation. The crucial factor is not the origin, but purity, concentration, and individual compatibility.

Conclusion

Cosmetic ingredients determine the efficacy, tolerability, and quality of a product. Understanding the INCI list allows for conscious decisions about one's skin. NATURFACTOR's Porcelain Skin Serum and Blue Crystal Drops stand for scientifically tested, skin-identical cosmetic ingredients with maximum transparency and uncompromising compatibility.

Sources

1. Wikipedia (DE): Kosmetische Inhaltsstoffe
2. Bundesamt für Verbraucherschutz und Lebensmittelsicherheit (BVL): Kosmetische Mittel
3. Wikipedia (DE): Tierversuchsverbot in der Kosmetik
4. BfR: Duftstoffe in kosmetischen Mitteln
5. Springer Medizin: Hautpflege und Hautbarriere (Review)