How to Read a Personal Care Ingredient Label

The ingredient list on a personal care product is the only place where what’s actually inside is disclosed. The front of the label is marketing. The back is information.

How the List Works

Personal care products sold in the US are required to list ingredients in descending order by concentration under the FDA’s Fair Packaging and Labeling Act. The first five to eight ingredients typically make up 80 to 95 percent of the formula. Everything below one percent can be listed in any order, which is where most of the preservatives, fragrances, and functional additives appear.

Ingredients are listed by their INCI name (International Nomenclature of Cosmetic Ingredients), a standardized naming system that’s consistent across international markets. This means “water” appears as “Aqua,” botanical extracts appear as their Latin species names, and synthetic compounds appear as their chemical names. This isn’t obfuscation — it’s the international standard — but it does make the list unfamiliar to most people.

Ingredients to Recognize and Avoid

Parabens: Preservatives that extend shelf life and have been studied for their ability to mimic estrogen in the body. They appear as methylparaben, ethylparaben, propylparaben, butylparaben, and isopropylparaben. They’re detectable in human urine and tissue samples. The EU has restricted butylparaben and propylparaben in leave-on products. Many brands have removed them voluntarily.

Phthalates: Appear rarely by name on cosmetic labels because they’re often part of “fragrance” (see below). When listed directly, look for dibutyl phthalate (DBP) in nail polish, where it functions as a plasticizer. Phthalates are endocrine-disrupting compounds linked to hormonal effects at sufficient exposure levels.

Fragrance / Parfum: A single ingredient entry that can legally represent hundreds of individual chemical compounds, none of which are required to be disclosed. Manufacturers claim trade secret protection for fragrance formulations. This is where phthalates often hide. Fragrance is also the leading cause of contact dermatitis and allergic reactions in personal care products. “Natural fragrance” is not meaningfully better — the same lack of disclosure applies. “Fragrance-free” means no fragrance compounds have been added; “unscented” may still contain masking fragrances.

Formaldehyde and formaldehyde releasers: Formaldehyde itself appears occasionally as a preservative, but more often it’s released slowly by compounds added for that purpose. The releasers to recognize: DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea, quaternium-15, bronopol (2-bromo-2-nitropropane-1,3-diol), and methenamine. Formaldehyde is a known human carcinogen at occupational exposure levels. The concentrations in cosmetics are lower, but the combination with other sources of exposure across many products adds up.

PEGs (polyethylene glycols): Listed as PEG followed by a number (PEG-40, PEG-100, etc.), these are used as emulsifiers, thickeners, and penetration enhancers. The concern isn’t PEGs themselves but the manufacturing process, which can leave them contaminated with 1,4-dioxane and ethylene oxide, both of which are carcinogenic. The FDA has not set limits. New York State tested 25 personal care products in 2019 and found 1,4-dioxane contamination in several widely sold products including baby wash.

Sodium laureth sulfate (SLES) and similar ethoxylated compounds: The “eth” in the name indicates ethoxylation, the same process that creates the 1,4-dioxane contamination concern. Sodium lauryl sulfate (SLS, without the “eth”) does not have this issue.

Oxybenzone and octinoxate: Chemical UV filters found in many sunscreens. Oxybenzone is detectable in blood after a single application and has shown hormonal activity in laboratory studies. Hawaii and several other states have banned both compounds in sunscreens due to reef damage. Mineral sunscreens using zinc oxide or titanium dioxide as the active ingredient avoid these compounds entirely.

Aluminum compounds: Aluminum chlorohydrate and aluminum zirconium compounds are the active antiperspirant ingredients that block sweat ducts. The research on aluminum and breast cancer risk or Alzheimer’s association is genuinely inconclusive — the studies are mixed. For people who prefer to avoid it, aluminum-free deodorants (which affect odor but not sweat production) are the alternative.

Ethanolamines (DEA, TEA, MEA): Diethanolamine, triethanolamine, and monoethanolamine are used as emulsifiers and pH adjusters. DEA in particular can react with other ingredients to form nitrosamines, which are carcinogenic. The EU restricts DEA in cosmetics. In the US, no restriction exists.

A Practical Reading System

Rather than memorizing every compound, use this tiered approach:

Step one — check the first five ingredients. This is the bulk of the product. Water, glycerin, and plant-based emollients at the top are generally fine. Fragrance or parfum in the top five is a flag.

Step two — scan for the keywords. Paraben (any form), fragrance/parfum, -eth- in any ingredient name, DMDM, quaternium-15, oxybenzone, and PEG are all worth flagging.

Step three — use EWG’s Skin Deep database. Search the product by name or paste in individual ingredient names. Skin Deep aggregates the published research and regulatory status for over 100,000 ingredients. It’s the most practical reference tool available for this.

Step four — understand the difference between “free-from” marketing and actual formulation. “Paraben-free” tells you one thing is absent but says nothing about the rest of the formula. A paraben-free product can still contain formaldehyde releasers, synthetic fragrance, and ethoxylated compounds. The label claim is not the same as a clean formulation.

Certifications That Help

EWG Verified: Products that carry this mark have been reviewed against EWG’s criteria and verified to avoid the ingredients on their Unacceptable list. It’s a meaningful signal.

MADE SAFE: A more rigorous certification that screens for a broader set of hazardous chemicals. Fewer products carry it because the standard is harder to meet.

COSMOS / Ecocert: European organic and natural certifications that prohibit synthetic preservatives, PEGs, and synthetic fragrance. Common on imported natural beauty brands.

Recommended Products

Browse personal care products verified against these standards at Non-Toxic Personal Care & Beauty

Products avoiding parabens: Products Free of Parabens

Fragrance-free options: Synthetic Fragrances-Free Products

Summary

The ingredient list is the only reliable source of information on a personal care product. Read from the top down, scan for parabens, fragrance, formaldehyde releasers, ethoxylated compounds, and chemical UV filters, and use EWG’s Skin Deep database to check anything unfamiliar. Front-of-label claims like “natural,” “clean,” or “free-from” narrow the field but don’t substitute for reading the actual list.