The front of a hair care bottle is marketing. The back, the small text in capitals, is the truth. Once you can read it, you stop being sold to and start choosing on substance.
This UK guide decodes hair care ingredient labels in 5 minutes.
What INCI is, and why it matters
INCI stands for International Nomenclature of Cosmetic Ingredients. Every cosmetic product sold in the UK and EU lists its ingredients in INCI format on the bottle. It's a legal requirement and standardised globally.
Key rule: ingredients are listed by descending weight. The first ingredient is the highest concentration; the last is the smallest. Anything below 1 % can be listed in any order, usually at the end.
So if you see "Aqua, Sodium Lauryl Sulfate, Glycerin" — water is the most, SLS is second-highest, glycerin is third. The marketing might shout about the glycerin, but the SLS is doing most of the cleaning.
The first 5 ingredients tell you everything
Most cosmetic products contain 20–50 ingredients. The top 5 represent 70–90 % of the formula. Read those first.
Typical first 5 in a shampoo:
- Aqua / Water (always)
- Primary surfactant (sulfate or sulfate-free)
- Secondary surfactant or thickener
- Conditioning agent
- pH adjuster or preservative
The hero ingredients the brand markets (argan oil! keratin! biotin!) are usually below position 10 — meaning trace amounts. Not bad, just not the main event.
Ingredients worth knowing (in shampoos)
The good surfactants (sulfate-free)
- Cocamidopropyl betaine
- Decyl glucoside
- Coco-glucoside
- Sodium cocoyl isethionate
- Sodium lauroyl methyl isethionate
The aggressive surfactants (sulfates)
- Sodium lauryl sulfate (SLS)
- Sodium laureth sulfate (SLES)
- Ammonium lauryl sulfate (ALS)
Not always bad — fine on uncoloured oily hair. Problematic for coloured, dry or sensitive scalps.
Conditioning actives
- Cetearyl alcohol, Behentrimonium chloride — standard slip and softness
- Panthenol (Vitamin B5) — hydration and minor repair
- Hydrolysed keratin, Hydrolysed silk — protein-based strengthening
Pigment- and colour-protecting ingredients
- Ethylhexyl methoxycinnamate — UV filter
- BHT — antioxidant
- Tocopherol (Vitamin E) — antioxidant
Ingredients worth knowing (in conditioners and masks)
Penetrating oils (do something for hair)
- Coconut oil (Cocos nucifera oil)
- Avocado oil (Persea gratissima oil)
- Argan oil (Argania spinosa kernel oil)
- Olive oil (Olea europaea fruit oil)
- Hemp seed oil (Cannabis sativa seed oil)
Coating-only oils (sit on top)
- Mineral oil (Paraffinum liquidum)
- Petrolatum
Light vs heavy silicones
- Light: cyclomethicone, dimethicone copolyol — give slip, wash out easily
- Heavy: dimethicone (especially high in the list) — build up over washes
Things to consider avoiding or limiting
- Parabens (methylparaben, propylparaben, ethylparaben) — preservatives with endocrine concerns. Most modern formulas use alternatives.
- Formaldehyde-releasing preservatives (DMDM hydantoin, imidazolidinyl urea) — can irritate sensitive scalps.
- Synthetic fragrance / parfum if you have a fragrance allergy. Otherwise fine in most formulas.
- Heavy mineral oils as the second or third ingredient — indicates a cheap occlusive product.
Real example: reading a Moné ingredient label
Take the Sparkling Shine Shampoo. The first 5 ingredients on a typical Moné shampoo formula:
- Aqua / Water
- A mild surfactant (sulfate-free)
- Cocamidopropyl betaine (mild secondary surfactant)
- Glycerin (humectant for hydration)
- A conditioning agent
Lower in the list: the 8-oil complex (grapeseed, olive, macadamia, coconut, avocado) and vanilla fragrance. The oils are present but not in large quantity — that's normal for a shampoo. For high oil delivery you'd reach for a conditioner or mask, not a shampoo.
Frequently asked questions
Why do brands hide bad ingredients at the end of the list?
They don't "hide" them — it's regulatory order. Bad ingredients high on the list aren't allowed without warning labels in the UK and EU.
Are "natural" ingredients always better?
No. "Natural" isn't regulated, and many synthetic ingredients are gentler than essential oils (which can irritate).
Should I worry about preservatives?
No — cosmetics need preservatives or they grow mould. Modern preservatives like phenoxyethanol and sodium benzoate are well-tolerated.
What does "-free" mean if it's not on the INCI?
A claim like "paraben-free" or "sulfate-free" is checked against the INCI. If the ingredient isn't listed, the claim is valid.
Is there an app to scan ingredients?
Yes — Yuka (UK) and INCI Beauty are popular. They give a score per product. Useful as a starting point, but the score depends on their algorithm — don't take it as gospel.
Build your routine around ingredients you understand. Start with the Moné Best Sellers — INCI lists are on every product page. Free UK delivery over £20.