Synthetic Perfume and Hormone Disruptors in Cosmetics
Did you know that up to 3,691 fragrance chemicals can legally be hidden under one word on a UK cosmetic label?
That word is Fragrance or Parfum.
When I began creating natural perfume in the UK, I quickly discovered how secretive the fragrance industry really is. There are no clear guides explaining how to build natural scent profiles. Very little is shared publicly.
After nearly a year of research and formulation trials, I uncovered something far bigger than scent creation. I discovered the scale of synthetic perfume chemicals used globally and how little transparency exists around them.
How Many Chemicals Are in Fragrance
According to the 2025 IFRA Transparency List, there are currently 3,691 ingredients approved for use in fragrance.
- 3,312 fragrance ingredients used for scent or odour masking
- 379 functional ingredients including solvents, preservatives and antioxidants
- 1,021 Natural Complex Substances derived from plant materials
Yet on a cosmetic label in the UK or EU, most of these can legally be grouped together under Fragrance or Parfum.
Only 26 allergens must be individually declared.
You can explore the full list here: View the IFRA Transparency List
The 26 Declared Allergens
In the UK and EU, 26 fragrance allergens must be listed when present above certain concentrations.
For example, if lavender essential oil is used, Limonene, Geraniol and Linalool must appear on the label. These occur naturally in essential oils and can cause sensitisation in some individuals.
The important distinction is this: the declared allergens are often naturally occurring. Thousands of other synthetic fragrance chemicals do not require separate disclosure.
Hormone Disruptors in Synthetic Perfume
Some fragrance ingredients have been studied for their potential to interfere with hormone systems. These are often referred to as endocrine disruptors.
Phthalates Including Diethyl Phthalate
Phthalates are commonly used as solvents and fixatives in fragrance blends. Research has linked certain phthalates to endocrine disruption and reproductive concerns. Diethyl phthalate may be present within the fragrance mixture without being individually listed.
Synthetic Musks Including Musk Ketone Galaxolide and Tonalide
Synthetic musks are widely used in mainstream perfumes. Some studies have found that certain musks can accumulate in human tissue. Laboratory research suggests possible interaction with hormone receptors.
Benzophenone Derivatives Including Oxybenzone
Benzophenone derivatives are used in some cosmetic formulas for UV stabilisation. Research has explored their potential impact on hormone and thyroid pathways.
Why Fragrance Transparency Matters
Fragrance is not limited to perfume. It is found in skincare, haircare, cleaning products, air fresheners, candles, and even retail environments.
Everything is technically a chemical. The real issue is transparency, cumulative exposure and informed choice.
Choosing Natural Fragrance in the UK
Natural fragrance uses plant derived essential oils, resins and absolutes rather than synthetic aroma chemicals. While natural does not automatically mean risk free, it generally offers greater ingredient transparency.
- Choose brands that disclose full fragrance compositions
- Avoid products that list only Fragrance or Parfum
- Use the IFRA Transparency List to research ingredients
You Are in Control
This information is public, but rarely presented clearly. My role is to simplify it so you can make informed decisions about what you put on your body.
Melissa x