Your shampoo bottle lists twenty-two ingredients. The last one is "fragrance." That one word represents a single ingredient slot — but it could contain anywhere from 1 to over 3,000 distinct chemical compounds. You'll never know which ones unless the brand tells you voluntarily. Most don't.
This isn't a conspiracy. It's a legal trade secret provision embedded in US cosmetic regulation since 1966. Fragrance formulas are proprietary. Brands are not required to disclose what's in them.
Why "fragrance" is a trade secret
Under the Fair Packaging and Labeling Act of 1966 and the FDA's cosmetics regulations (21 CFR 701.3), cosmetic manufacturers must list all ingredients — with one exception: fragrance and flavor compounds can be declared as "fragrance" or "flavor" without disclosing component ingredients.
The Campaign for Safe Cosmetics has documented that the word "fragrance" can conceal as many as 3,163 separate ingredients. The FDA requires none of them to be disclosed. Third-party testing has identified dozens of chemicals of concern — including phthalates, synthetic musks, and formaldehyde-releasing compounds — hiding under this single ingredient declaration.1
What's actually in "fragrance"?
Phthalates
Phthalates — particularly diethyl phthalate (DEP) — are used in fragrance formulas to help scent adhere to skin and last longer. Research has linked certain phthalates to endocrine disruption — interference with hormone signaling pathways.3
[Inference: Whether fragrance-applied phthalate exposure at typical consumer product doses causes measurable harm remains an active area of research. A precautionary approach — choosing fragrance-free or phthalate-free options — is reasonable given daily multi-product exposure.]
Phthalates are not required to be listed separately on cosmetic labels. If a product contains "fragrance," it may contain phthalates.
Synthetic musks
Synthetic musks (including polycyclic musks like galaxolide and tonalide) are used to create clean, fresh base-note scents. They're detectable in human blood, breast milk, and adipose tissue, indicating they're absorbed through the skin and accumulate over time. Some polycyclic musks have shown estrogenic activity in lab settings.4
Formaldehyde-releasing preservatives
DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea, quaternium-15, and bronopol are preservatives that release small amounts of formaldehyde over time. Formaldehyde is classified as a known human carcinogen by the IARC.5 Concentrations in typical cosmetic products are well below levels associated with acute toxicity, but cumulative daily exposure across multiple leave-on products is a reasonable concern.
Allergens
Fragrance is the most common cause of contact allergic reactions to personal care products, affecting both adults and children.6 The EU requires labeling of 26 specific fragrance allergens above threshold concentrations. The US has no equivalent requirement.
Where "fragrance" shows up
- Skincare: Moisturizers, serums, eye creams, face wash, toner
- Hair care: Shampoo, conditioner, leave-in treatments, dry shampoo
- Body care: Body wash, lotion, deodorant, antiperspirant
- Cleaning: Dish soap, laundry detergent, fabric softener, surface cleaners
- Baby products: Some baby washes, wipes, and lotions
How to find fragrance on a label
Fragrance hides under several names:
- Fragrance — the standard US declaration
- Parfum — used by European and some Canadian brands
- Aroma — common in aromatherapy and natural product lines
- Natural fragrance — natural source doesn't mean disclosed; essential oils can also be sensitizing
Fragrance-free vs. unscented: the difference
Fragrance-free means no fragrance compounds were added for scent purposes.
Unscented means no perceptible smell — sometimes achieved by adding a masking fragrance. "Unscented" products can still contain fragrance.
For people managing allergies or seeking to minimize exposure: choose fragrance-free, not unscented.
What to use instead
Criteria for fragrance-free alternatives: labeled fragrance-free (not unscented), no "fragrance," "parfum," or "aroma" on the INCI list, preferably EWG Verified or MADE SAFE certified.
Run your current products through EWG Skin Deep or the Think Dirty app to check fragrance status before buying.
The bottom line
"Fragrance" is one of the most loaded words on a personal care label. The practical path: choose fragrance-free where it matters most (products used daily, left on skin, used by children), and use EWG Skin Deep to run unfamiliar products. You don't need to throw everything out — start with your daily face and body products.