What is INCI? How to Read a Skincare Ingredient Label

Every skincare product sold in Europe, North America, and most of the world must list its ingredients using standardised INCI names. Once you understand the system, those intimidating ingredient lists become readable — and you stop buying products based solely on marketing claims on the front of the bottle.

What Does INCI Stand For?

INCI stands for International Nomenclature of Cosmetic Ingredients. It was developed by the Personal Care Products Council and is adopted by regulatory authorities worldwide, including the EU Cosmetics Regulation (EC No 1223/2009) and the FDA. The system assigns each cosmetic ingredient a unique standardised name — typically derived from Latin botanical names, systematic chemical names, or modified common names — ensuring that the same ingredient is called the same thing on every product label, regardless of brand, country, or marketing name.

For example, what a brand might call "vitamin C" on the front of the bottle will appear as "ascorbic acid" or "l-ascorbic acid" in the INCI list. What's marketed as "retinol" appears as "retinol" in INCI (one of the few cases where the common and INCI names match). Hyaluronic acid appears as "sodium hyaluronate" in most formulas, because this salt form is more stable than the free acid.

How Ingredient Lists Are Ordered

Under both EU and US regulations, ingredients must be listed in descending order of weight/concentration — with one important exception: ingredients present at concentrations of 1% or less can be listed in any order after the main ingredients. This means the first five to ten ingredients are the true backbone of the formula and typically account for 80–95% of its volume. Everything listed towards the bottom — particularly after preservatives like phenoxyethanol or parabens, which are typically used at 0.1–1% — is present in very small amounts.

How to Identify Key Ingredient Concentrations

Since exact percentages aren't required on consumer labels, you have to make educated inferences. Practical strategies:

• Position in the list: An ingredient listed in the top five is present at meaningful concentration. An ingredient listed after phenoxyethanol or fragrance is likely below 1%.
• Water (Aqua) as a reference: Water is almost always the first ingredient and typically makes up 60–80% of a formula. Ingredients listed immediately after it are at progressively lower concentrations.
• Percentage claims on packaging: Some brands voluntarily disclose percentages of key actives. This is the most transparent approach and makes comparison easy.
• Known usage ranges: Niacinamide is typically effective at 2–10%. Vitamin C requires 10–20%. Retinol ranges from 0.01% to 1%. If an active is listed very low on the label, it may be at a concentration too low to deliver results.

Common INCI Names You Should Recognise

• Aqua / Water: The base of most formulas. Its position tells you nothing interesting — it's always first or near-first.
• Glycerin: A humectant that draws moisture into the skin. One of the most well-researched and effective moisturising ingredients. Very low cost, very high efficacy.
• Niacinamide: Vitamin B3. Appears as "niacinamide" in INCI — one of the easier names to spot.
• Sodium hyaluronate: The salt form of hyaluronic acid, the most common form used in formulations for stability.
• Retinol: Vitamin A. Listed as "retinol" in INCI. Retinaldehyde appears as "retinal" or "retinaldehyde."
• Ascorbic acid / L-ascorbic acid: Vitamin C in its most potent form.
• Tocopherol: Vitamin E. A fat-soluble antioxidant frequently paired with vitamin C.
• Phenoxyethanol: One of the most common preservatives. Its position in the list is a useful marker — ingredients below it are likely at 1% or less.
• Parfum / Fragrance: Any fragrance ingredient. A single "parfum" entry can represent a blend of dozens of individual compounds.

Ingredients to Be Aware Of

Not all ingredients on a label are cause for concern, but some are worth noting depending on your skin type. Alcohol denat (denatured alcohol) can be drying and barrier-disrupting when high in the list, though it's relatively harmless in small amounts. Fragrance (parfum) is the most common cause of contact dermatitis from skincare. Essential oils — often listed by their Latin botanical names — can also be sensitising for reactive skin. Silicones (dimethicone, cyclomethicone) are non-comedogenic film-formers; contrary to common belief, they do not block pores.