How to Read Skincare Ingredient Lists: Order, the 1% Line, and Fragrance

An ingredient list ranks ingredients from most to least by weight, but only down to the 1 percent line. Below that line, a brand may list ingredients in any order. And a cosmetic label never has to print a single percentage, so position tells you rank, not dose. Below is how to read skincare ingredient lists: the US and EU ordering rules, the 1 percent line, INCI names, fragrance, and what no list can tell you.

How to read skincare ingredient lists in five steps

1. Check which label you are holding. A Drug Facts box means a drug, such as a sunscreen or an acne treatment, with its own rules. A plain "Ingredients" list means a cosmetic.
2. Read the top five. On a cosmetic, these are the largest amounts in the product, usually the base that carries everything else.
3. Find the 1 percent line. Below it, order means nothing. Phenoxyethanol, if present, is a useful marker.
4. Scan for fragrance. Look for "fragrance," "parfum," or named fragrance allergens, plus anything you have reacted to before.
5. Look for printed numbers, then convert them. A percent or ppm figure on the carton is the only dose information you will get. The guide to what ppm means does the conversion.

Each step is explained below.

What order are skincare ingredients listed in?

In the US, the rule is 21 CFR 701.3. A cosmetic label must declare each ingredient in descending order of predominance. The FDA's labeling summary restates it, with exceptions for color additives and for ingredients at one percent or less.

The EU wording is more exact. Under the EU cosmetics regulation, the list is established in descending order of weight of the ingredients at the time they are added to the product. It must be preceded by the word "ingredients."

Water usually comes first because most products are mostly water. Everything above the 1 percent line follows in falling order of weight. That part of the list is fixed by rule, and a brand cannot rearrange it for marketing.

The 1 percent line, and how to find it

Both systems let the tail of the list go out of order. In the US, ingredients above 1 percent come first, in descending order. Ingredients at 1 percent or less may follow without respect to order of predominance, and color additives go last, in any order.

The EU rule is the same in substance. Ingredients below 1 percent may be listed in any order after those above 1 percent. Colorants may follow the other ingredients in any order, named by their Color Index (CI) numbers.

No label marks the line. You have to infer it, and one preservative makes that easier. The EU caps phenoxyethanol at 1.0 percent in its list of permitted preservatives. According to a 2019 review, EU safety scientists judged it safe for all consumers as a preservative at up to 1 percent.

So on a formula that follows that cap, every ingredient after phenoxyethanol, other than color additives, sits at 1 percent or less. Some ingredients before it may also be under 1 percent, since the free-order zone can begin earlier. The marker shows where the line has certainly been crossed, not where it starts.

One consequence surprises people. The last ingredient on a list is not necessarily the smallest. Below the line, the order is the brand's choice.

What INCI names are, and why labels read like chemistry

INCI stands for International Nomenclature of Cosmetic Ingredients. The EU builds its official glossary of ingredient names on internationally recognized nomenclatures, including INCI. The US rule works from its own hierarchy. After any name set by FDA, a label uses the name given in the industry's cosmetic ingredient dictionary, and then other listed references.

Both systems push brands toward standard names rather than marketing names. That cuts two ways. A chemical-sounding name is not a warning sign. Niacinamide, for instance, is the amide form of vitamin B3. And a friendly name on the front of the box, such as a branded "complex," is not an ingredient name at all. The list shows the parts, not the brand.

A few things never reach the list. US rules do not require incidental ingredients that are present at insignificant levels and have no function in the finished product. The FDA's cosmetics labeling guide gives two examples. One is a preservative that arrived inside a raw material, diluted below the level where it still works. The other is a defoaming agent used during processing. EU law likewise does not count impurities in raw materials as ingredients.

Fragrance, parfum, and the allergens behind them

One word can stand for a whole mixture. US rules allow fragrance to be listed simply as "Fragrance". The FDA explains why: fragrance formulas are complex mixtures of many natural and synthetic ingredients, and they are the components most likely to be trade secrets. For the same reason, an ingredient the FDA accepts as a trade secret may appear only as "and other ingredients" at the end of a list.

The EU uses "parfum" or "aroma," but adds a second layer. Certain fragrance allergens must also be named in the list when they exceed 0.001 percent in leave-on products or 0.01 percent in rinse-off products. In 2012, the EU's scientific committee identified 56 more fragrance allergens that have clearly caused allergies in people. A 2023 regulation added an individual labeling duty for them. Products that did not comply could be placed on the EU market until 31 July 2026, and made available until 31 July 2028.

The US is behind. The 2022 cosmetics law requires labels to identify each fragrance allergen in a product, with the list of allergens to be set by FDA regulation. When we searched the Federal Register in September 2026, we found no proposed rule from the FDA. No US allergen list is in force yet, so a US label can still say "fragrance" and stop there.

Front-of-box words do not fill the gap. The FDA says there is no federal standard or definition for "hypoallergenic," "fragrance-free," or "for sensitive skin." The list is the evidence. The front of the box is a claim.

Why position is not dose

A list gives you rank. It never gives you amount. Even for a well-known active, the percentage is often missing. As one dermatologist told the AAD, for over-the-counter products there is no standard requirement that the percentage of retinol be disclosed on the label or packaging.

Low on the list does not mean useless. Some actives are formulated in tiny amounts. Peptides are the clearest case, covered in why peptides work in parts per million. High on the list does not mean active, either. The top of most lists is the base: water, humectants, and solvents that carry everything else.

Position plus a printed number tells you much more. Our re:vive-B3 ampoule lists niacinamide second, right after water, and its carton states the amount: 210,000 ppm, which is 21 percent. Position alone could only have told you "a lot." Whether a number like that does more than a smaller one is a separate question, taken up in the niacinamide guide.

Some things no list can show. The pH of the formula. How stable the active is after opening. How much of anything gets past the outer layer of your skin. The list describes what went into the bottle, and nothing after that.

Drug Facts labels follow different rules

Sunscreens and acne treatments are drugs under US law. Moisturizers and makeup with SPF labeling are regulated as both cosmetics and drugs. Their labels work differently.

A drug's active ingredients come first, under "Active ingredients." For a topical product, the label states the proportion of each one, usually as a percentage. If there is more than one active, they appear in alphabetical order. The inactive ingredients follow, and here is the trap. Under 21 CFR 201.66, a drug that is not also a cosmetic lists its inactive ingredients in alphabetical order. A drug that is also a cosmetic uses the cosmetic ordering rules instead.

So on a drug-only product, the inactive list says nothing about amounts. The Drug Facts box, with its printed percentages, is where the dose information lives. Our guide to Korean sunscreens covers why the permitted filters differ by market.

Frequently asked questions

Are skincare ingredients listed by percentage?

No. They are listed by weight, from most to least, but only down to the 1 percent line. Below it, the order is free, and cosmetic labels do not have to print any percentages at all. Drug Facts labels are the exception, since they state the strength of each active ingredient.

What does it mean when an ingredient is listed last?

Less than you might think. Ingredients at 1 percent or less can appear in any order, and color additives go at the very end regardless of amount. The last name on the list is not necessarily the smallest amount in the bottle.

What does "and other ingredients" mean on a label?

It stands in for an ingredient the FDA has accepted as a trade secret. US rules allow that phrase at the end of the list in place of the ingredient's name. Fragrance can also appear as a single word, "fragrance," for similar trade secret reasons.

Does fragrance-free mean a product has no fragrance ingredients?

Not necessarily. The FDA says there is no federal standard or definition for "fragrance-free," "hypoallergenic," or "for sensitive skin." Read the list itself for "fragrance," "parfum," and any named fragrance allergens.

Why is water usually the first ingredient?

Most skincare is mostly water, and the list runs from the largest amount down. A product that starts with something else, such as an oil or a plant water, is built on a different base. That tells you about texture and format, not strength.

How do I find the percentage of an active ingredient?

Look for a figure on the carton or product page, in percent or in ppm. Divide ppm by 10,000 to get percent. With no printed figure, the list can only suggest whether the active sits above or below the 1 percent line, and sometimes not even that.

Related reading: What does ppm mean in skincare?, Peptides in skincare, Niacinamide benefits.