What is actually in a face mask

Ingredient lists are printed in descending order of weight, so the first name on the pack is the bulk of the product. On 191 of our 215 masks that first name is water. On another 10 it is a flower water, a leaf juice or a thermal spring water, which is water with a provenance and a price.

The interesting part is that those 191 lists spell it 16 different ways. Aqua is the legal INCI name; the rest are house style, and every one of them is the same molecule.

This is the first thing worth internalising about a mask: you are buying water, plus a system for holding it against your face for fifteen minutes, plus a small amount of everything else. That is not a criticism. Hydration is most of what a mask can plausibly do in a single sitting, and water is the only way to deliver it.

Across 215 masks we resolved 5,941 printed entries against an encyclopaedia of 301 substances. The distribution is brutally uneven. Nine ingredients account for the spine of almost every formula, and 194 of the 215 masks contain both water and Glycerin, the two cheapest, most boring, best-evidenced things on the shelf.

Read that table as a recipe and a mask stops being mysterious: water to carry it, a humectant to hold water in the skin, a gum to stop the whole thing running off your chin, a preservative so it survives the eighteen months between factory and face. Everything a brand puts on the front of the box is what is left over.

List length varies by a factor of twenty. The median mask prints 26 entries. The shortest on the site is Dr. Hauschka Clarifying Clay Mask with 4:

The longest is Shiseido Vital Perfection LiftDefine Radiance Face Mask at 81 entries. Neither number is a verdict. A four-entry clay mask is short because clay, starch and two plant extracts genuinely is the formula; an 81-entry sheet mask is long because it carries a dozen extracts at a fraction of a per cent each, which is a different strategy rather than a worse one.

Short does not mean simple, and long does not mean dirty

The pairing that makes this clearest is SK-II Facial Treatment Mask. It runs to 7 entries, costs €89.99, and is one of the most expensive masks here. Set it against a supermarket sheet mask with three times the list and a twentieth of the price. Length tells you about a formulator’s philosophy. It tells you nothing about quality, and nothing at all about what the product will do to your face.

The most useful finding in the corpus is a negative one. Of the 280 substances that actually appear on these labels, 216 are ones we grade as well tolerated, 48 depend on you or on dose, and 16 are worth knowing about: EU-restricted, a common contact allergen, or genuinely disputed. The number we grade as avoid is 0.

well tolerated

216well toleratedno meaningful concern for most people

worth a second look

64worth a second lookdose-dependent, restricted, or a known allergen

banned substances found

0banned substances foundout of 8 we document specifically to check for

We document 8 EU-banned substances: Butylphenyl Methylpropional, Formaldehyde, Hydroquinone and others, precisely so we can check for them. They appear in 0 of these masks. Along with 21 further substances written up for reference and found in nothing we list, they live on the EU watchlist.

This is what the EU cosmetics regime actually buys you, and it is worth being plain about it: by the time a mask is legally on sale in a European shop, the genuinely dangerous decisions have already been taken off the table. What is left on the label is a question of fit: your skin, your allergies, your tolerance for fragrance. Not safety.

• Read the first five names, then stop. They are most of the product. If the thing on the front of the box is not among them, it is present in small change, which the ≈1% line explains.
• Ignore list length as a quality signal.It measures a formulator’s approach, not their care.
• Spend your suspicion on fragrance, not on preservatives. The fragrance entries are where the avoidable reactions in this corpus live. The preservatives are capped, listed and mostly dull.