How Ingredient Scoring Goes Wrong

What replaced the ingredient you were scared of

Somewhere in a formulation lab this week, a chemist crossed out a familiar ingredient name and wrote in one nobody has heard of yet.

Not because the old one stopped working. Because it became famous for the wrong reasons, and a product with that name on the label will not sell. So it gets replaced with something that does the same job and carries no reputation at all. Not a good one. Not a bad one. None.

This happens constantly in skincare right now, and almost nobody notices, because the whole point of the swap is that it is invisible. A villain leaves the label. Something with no history walks on in its place. The formula looks safer. Whether it is safer is a completely separate question, and it is the one nobody is asking.

The preservative that replaced the one you were told to fear

Parabens are among the most studied ingredients in cosmetics. Decades of data, wide margins of safety at cosmetic concentrations, reviewed repeatedly by regulators. They also became the first big villain of the ingredient-fear era, blamed for effects the evidence never actually supported at the doses used in skincare.

So brands dropped them. Many reached for a preservative called methylisothiazolinone, usually shortened to MIT, used on its own rather than in the mixture it originally shipped in. It worked. It was not a household name. It did not trigger anything. It sailed under the radar for years while it scaled up across leave-on cosmetics.

Then the reaction started catching up with the ingredient. Contact allergy to MIT rose so sharply across Europe through the 2010s that dermatologists called it an epidemic, with reported rates as high as 6 to 12 percent in some countries among people patch tested for it. In 2017 the EU banned MIT outright from leave-on cosmetics and sharply restricted it elsewhere. The chemical had been known as a sensitizer since the 1980s in industrial use. Nobody had reckoned with what would happen once it went into millions of daily-use face creams under a name that raised no flags.

Why this keeps happening

None of this is a coincidence, and it is not really anyone's villainy either. It is what happens when the thing being scored is a name's reputation instead of the evidence behind it.

A blacklist, or a scanning app built around one, can only flag what it already recognizes. A synthetic ingredient with forty years of published toxicology behind it will show up as “concerning” if it happens to be the one currently in disrepute. A newer substitute with three papers and a marketing page can sail through with a clean score, not because it is better understood, but because it has not been around long enough to accumulate a reputation either way. The scoring system rewards obscurity. Formulators, who are just trying to sell a product, respond to the incentive in front of them.

This is not limited to preservatives. It shows up anywhere an ingredient becomes the ingredient of the moment.

Fragrance is the other obvious case. “Fragrance-free” became a badge of gentleness, and a lot of brands responded by swapping synthetic fragrance blends for essential oils, marketed as the natural, kinder option. The chemistry runs the other way. Essential oils are concentrated mixtures of naturally occurring compounds, and several of the most common contact allergens recognized under EU cosmetics law, linalool, limonene, geraniol, citral, are exactly the molecules essential oils are built from. Synthetic fragrance can be engineered to lower or remove specific allergens. An essential oil cannot be edited. “Natural” bought a label. It did not buy a lower allergy risk, and in some formulations it plainly bought a higher one.

The silky white cream, and what’s actually inside it

Here is the part worth sitting with, because it applies to nearly everything in a skincare aisle. A moisturizer is not silky and white by nature. Nothing about combining water and oil produces that particular texture and that particular color on its own. Somebody engineered it. Something was added specifically to make the cream glide the way it does and look the way it does in the jar.

For decades, the answer was often dimethicone, a silicone. It is genuinely one of the most studied ingredients in cosmetics, reviewed by independent toxicology panels and by European regulators, and repeatedly found to carry a strong safety record on skin. It also became a villain, blamed in consumer conversation for clogging pores and being “unnatural,” claims the evidence does not particularly support.

So the industry is now in the middle of quietly replacing it. Newer emollients like hemisqualane, made from sugarcane, or coco-caprylate, derived from coconut, deliver a similar slip and finish and carry the appeal of a plant-based origin. Some of that newer generation has real safety data behind it already. None of it has what dimethicone has, which is decades of accumulated use, formal expert panel review, and a very long paper trail. That is not an accusation. It might turn out completely fine. The honest position is that we do not yet know it the way we know the ingredient it is replacing, and “we don’t yet know” is a different claim than “it’s safer,” even though the marketing tends to blur the two.

Every cream on the shelf is a formulated object. Something creates the silkiness. Something creates the white. The question worth asking was never whether that something has a scary-sounding name. It was always how well understood that something actually is, at the amount actually used.

The question that actually matters

Chasing scary names creates a kind of treadmill. An ingredient gets a bad reputation, sometimes fairly, often not. Formulators replace it with whatever is not yet flagged. That replacement accumulates its own real-world exposure in the dark, for years, while it enjoys a clean scorecard it has not actually earned. Eventually enough people react, or enough data accumulates, and the cycle starts again with a new villain and a new understudied substitute waiting behind it.

An ingredient list built around reputation cannot break that cycle, because reputation is exactly what it is measuring. The only way out is to score what is actually known: how much research exists, how strong it is, and at what concentration a given ingredient is genuinely present in the product, not just whether its name has been in the news.

That is a duller standard than a villain list. It is also the only one that would have caught the MIT problem before it became a decade-long epidemic instead of after.

If you want the specifics of how we do that, the scoring method is published in full, and the ingredient library lists concentration thresholds and EU limits for each entry.

Sources

1. Schwensen JF, et al. “The epidemic of methylisothiazolinone: a European prospective study.” Contact Dermatitis, 2017. Documents the MIT contact-allergy epidemic across multiple European countries.
2. European Commission, Regulation amending Annex V to the Cosmetics Regulation (EU) No. 1223/2009, 2017. Restricts and bans methylisothiazolinone in leave-on cosmetic products.
3. Cosmetic Ingredient Review, dimethicone and related silicone ingredients, safety assessment. Independent US expert panel review concluding dimethicone is safe as used in cosmetics.
4. EU Cosmetics Regulation (EC) No. 1223/2009, Annex III, list of fragrance allergens requiring labeling above threshold concentration.