PFAS, or per- and polyfluoroalkyl substances, have become a major public health and environmental issue.
These chemical compounds, nicknamed "eternal pollutants", are found in a multitude of everyday products, including cosmetics .
Their persistence in the environment and their impact on human health are raising growing concerns. But what exactly are PFAS? Why is their use in cosmetics so widespread? This first part answers these questions by providing an in-depth understanding of PFAS and their unique properties.
1. What are PFAS?
A family of synthetic chemical compounds
PFAS encompass a large family of chemical substances, estimated at between 4,000 and 14,000 compounds, according to various scientific sources. Their main characteristic lies in their unique chemical structure, which includes carbon-fluorine bonds. These bonds are among the strongest in organic chemistry, giving PFAS exceptional resistance to degradation. They are entirely synthetic compounds and do not occur naturally.
Remarkable physicochemical properties
PFAS possess physicochemical properties that explain their industrial success:
- Hydrophobic and lipophobic : They repel both water and grease, making them ideal for non-stick and waterproofing applications.
- Thermal and chemical stability : They withstand high temperatures and many aggressive chemicals.
- Amphiphily : Some PFAS are soluble in both water and organic solvents, facilitating their use as emulsifiers and dispersing agents.
These properties make them choice ingredients for a variety of sectors, ranging from electronics to cosmetics .
A worrying persistence in the environment
PFAS are nicknamed "forever pollutants" because of their inability to break down in the environment. Their chemical stability allows them to accumulate in soils, water, and living organisms. This persistence is a major environmental concern, as it leads to long-term contamination of ecosystems.
Origin and industrial development
Created in the 1950s, PFAS were initially used for their non-stick properties in products like Teflon. Their use quickly expanded to other areas, including textiles, food packaging, fire extinguisher foams, and of course, cosmetics.
Applications in cosmetics
In cosmetics, PFAS play a crucial role thanks to their unique properties:
- Texture improvement : They give products a soft and silky feel.
- Long-lasting effect : They prolong the life of makeup, especially waterproof lipsticks and mascaras.
- Water and oil resistance : Their hydrophobicity makes them essential in moisture-resistant formulations.
- Product uniformity : As emulsifiers, they help to stabilize complex mixtures.
Examples of products containing PFAS
PFAS are commonly found in mascaras, foundations, makeup powders, lipsticks, and anti-aging skincare products. Their presence in these products often stems from their ability to enhance the performance of the formulations.
2. Why are PFAS used in cosmetics?
The chemical and physical properties of PFAS make them particularly popular ingredients in the cosmetics industry. These substances are used to improve product performance, extend shelf life, and meet consumer expectations regarding texture, strength, and durability. This section explores in detail the reasons for their use in cosmetics and the products most affected.
Desired properties in cosmetic formulations
PFAS offer specific benefits that justify their inclusion in conventional cosmetic products:
- Hydrophobicity : PFAS repels water, making products resistant to humidity and contact with water, a major advantage for waterproof mascaras and long-lasting lipsticks.
- Lipophobia : By repelling oils, these substances allow products to remain uniform, even in the presence of sebum, which is essential for foundations.
- Texture improvement : PFAS provide a soft and silky feel, highly valued in powders and skincare products.
- Long-lasting effect : They extend the lifespan of products by improving their adhesion to the skin or lips.
- Chemical stability : Their ability to resist degradation ensures that the products retain their properties, even in harsh environmental conditions (heat, humidity).
These unique characteristics allow manufacturers to meet high consumer expectations for cosmetic performance.
Cosmetic products containing PFAS
PFAS are primarily found in products designed to offer long wear, water resistance, or an improved texture. Here are the product categories most affected:
- Waterproof mascaras : PFAS are incorporated to guarantee water resistance and prolong their duration without smudging.
- Foundations : They help maintain even coverage throughout the day.
- Long-lasting lipsticks : PFAS improve pigment fixation, preventing transfer onto glasses or clothing.
- Makeup powders : These substances ensure a fine and silky texture, facilitating application and comfort on the skin.
- Anti-aging skincare, deodorants and sunscreens : PFAS can play a role in stabilizing formulas and improving their resistance to external aggressions, such as sweat or natural skin oils.
Examples of PFAS ingredients in cosmetics
PFAS appear in the INCI list under specific names, often difficult for consumers to recognize. Among the most common are:
- PTFE (polytetrafluoroethylene)
- Perfluorodecalin
- Perfluorononyl dimethicone
- Polyperfluoromethylisopropyl ether
- Perfluorohexane
- Methyl perfluoroisobutyl ether
These ingredients play a variety of roles, ranging from texturizing agents and stabilizers to film-forming agents. Their presence can be masked by generic terms, making them difficult for users to identify.
Why aren't these alternatives widespread yet?
Despite the risks associated with PFAS, replacing them remains a challenge for the cosmetics industry. The reasons include:
- Reformulation complexity : PFAS are often key ingredients in formulations, and their substitution requires a complete overhaul of the recipes, which can affect product performance.
- Cost of alternatives : Biodegradable or natural substitutes are often more expensive, making their adoption less accessible for some companies.
- Technical constraints : The alternatives must offer the same advantages in terms of texture, durability and resistance, which limits the available options.
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3. What are the dangers of PFAS in cosmetics?
PFAS, while valued for their technical performance, pose serious public health and environmental problems. Their toxicity, combined with their persistence in the environment, makes them a long-term threat. This section details the impacts of PFAS on human health and the ecosystem, drawing on scientific studies and precise data.
Risks to human health
PFAS are bioaccumulative, meaning they gradually accumulate in the human body over time through food, water, or even skin exposure via cosmetics. This accumulation has been linked to numerous adverse health effects:
- Endocrine disruptors : PFAS interfere with the hormonal system, affecting key functions such as growth, reproduction, and metabolism. They are particularly suspected of disrupting thyroid function.
- Immunotoxic effects : Studies have shown that PFAS reduce the effectiveness of the immune system, decreasing the body's ability to fight infections and reducing responses to vaccines.
- Reproductive and developmental toxicity : In pregnant women, exposure to PFAS has been linked to lower birth weights and developmental abnormalities in newborns.
- Carcinogenicity : Some PFAS, such as PFOA and PFOS, are classified as probable carcinogens by health agencies, being associated with cancers of the liver, kidneys, and testicles.
- Cardiovascular and metabolic problems : PFAS are linked to high cholesterol levels and liver dysfunction.
Cosmetics containing PFAS, applied directly to the skin, increase the risks of exposure, particularly through skin absorption.
Environmental impact
The chemical stability of PFAS, while an advantage for their industrial use, poses a major environmental challenge. These substances, resistant to degradation, cause lasting contamination of ecosystems.
- Soil and water contamination : PFAS migrate easily through soils and groundwater, reaching drinking water sources. Studies have revealed their presence in concerning concentrations in rivers and lakes worldwide.
- Atmospheric spread : Some volatile PFAS disperse in the air, allowing for large-scale pollution. They have even been detected in remote regions, such as the Arctic.
- Bioaccumulation in wildlife : These substances accumulate in living organisms, disrupting the food chain. For example, PFAS have been found in the tissues of marine animals and large predators, such as polar bears.
- Risk of transgenerational pollution : PFAS present in the environment can be passed on to future generations, amplifying their impacts on ecosystems.
Key scientific data
Several studies highlight the dangers of PFAS:
- An analysis of 231 cosmetic products by the Green Science Policy Institute (2021) revealed that nearly 50% of the mascaras, lipsticks and foundations tested contained PFAS, often not declared in the ingredient lists.
- A study conducted by Public Health France (2019) demonstrated that 100% of blood samples from pregnant women contained traces of PFAS, confirming their omnipresence and bioaccumulation.
- A 2024 study published in Environment International revealed that PFAS can cross the skin barrier, increasing the risks of direct exposure via cosmetics.
Combined effects: the cocktail effect
Exposure to cosmetic PFAS is not limited to a single source. They often interact with other environmental contaminants, amplifying their harmful effects. This phenomenon, known as the "cocktail effect," represents an even greater threat to human and environmental health.
4. Global and local regulations on PFAS
Faced with the significant risks associated with PFAS, international and national authorities have progressively introduced regulations to limit their use. These laws aim to protect public health and the environment while imposing constraints on the industries concerned, including the cosmetics sector.
International regulation: global initiatives to regulate PFAS
Global efforts to limit PFAS rely on frameworks such as the Stockholm Convention on Persistent Organic Pollutants:
- Stockholm Convention (2001) : This international treaty regulates persistent organic pollutants, including certain PFAS such as PFOS (perfluorooctane sulfonate). Since 2009, PFOS has been restricted to specific uses (hydraulic fluids, anti-reflective coatings), while other compounds, such as PFOA, have been banned since 2020.
- Overall objectives : To reduce PFAS emissions through coordinated actions, including the development of alternative technologies and the management of waste containing these substances.
These initiatives lay the groundwork for countries to incorporate industry-specific restrictions, including cosmetics.
European regulations: a proactive fight against PFAS
The European Union is at the forefront of regulating PFAS, relying on ambitious directives:
- REACH Regulation (1907/2006) : This framework for managing chemicals classifies PFAS as a priority substance for restriction. In 2023, a proposal submitted by five Member States (Germany, Denmark, the Netherlands, Norway, and Sweden) aimed to ban the manufacture, import, and use of 10,000 PFAS within the European Union.
- Regulation (EC) No 1223/2009 : Since June 2020, certain perfluorinated substances, including PFOA, have been banned in cosmetics. This measure is part of a broader strategy to strengthen consumer safety.
- Directive 2020/2184 on water intended for human consumption : Now includes 20 PFAS in its monitoring, with a maximum limit of 0.10 µg/L for their cumulative presence.
The European Union plans a total ban on PFAS in cosmetics by 2026, requiring a rapid transition for manufacturers.
French regulations: a pioneering legislative framework
In France, the authorities have adopted a strict approach to reducing the use of PFAS, with particular attention paid to cosmetics:
- Law of April 4, 2024 : This legislation progressively prohibits the manufacture, import and sale of products containing PFAS, including cosmetics, with full implementation planned for 2026.
- Enhanced monitoring : Manufacturers must now provide detailed reports on their releases and uses of PFAS, contributing to greater transparency and a reduction in emissions.
This regulation makes France one of the countries most committed to the fight against PFAS in Europe.
Regulation in North America: Diverse Approaches
In the United States and Canada, measures against PFAS are developing at different levels:
- UNITED STATES :
- The "No PFAS in Cosmetics Act" (2021) aims to ban PFAS in cosmetic products. It is reinforced by the Modern Cosmetics Regulatory Act (MoCRA), which requires the FDA to assess their safety by 2025.
- States like California, Vermont, and Maryland have already implemented specific bans on PFAS in cosmetics.
- Canada :
- The Chemicals Management Plan includes an assessment of PFAS to reduce their environmental impact. Regulations are being developed to limit their use in cosmetics and other products.
These initiatives reflect a growing awareness in North America, although their implementation varies from state to state or province to province.
Challenges and implications for the cosmetics industry
Regulations pose significant challenges to cosmetics manufacturers:
- Product reformulation : Companies must revise their formulations to comply with the bans, a complex and costly process.
- Adaptation to local and international standards : Variations between regional regulations require manufacturers to adapt to the specific requirements of each market.
- Innovation and substitution : Developing alternatives to PFAS requires investment in research and development, but also represents an opportunity for the industry to distinguish itself with safer and more sustainable products.
5. Identification and laboratory analysis of PFAS in cosmetics
To ensure regulatory compliance and consumer safety, PFAS analysis in cosmetics has become a priority for specialized laboratories. These analyses identify the compounds present, measure their concentration, and verify their compliance with current regulations. This section explores the main analytical techniques used and their importance to the cosmetics industry.
Why analyze PFAS in cosmetics?
PFAS analysis is essential for several reasons:
- Ensuring product safety : PFAS can be toxic, and their identification is crucial to minimizing risks to consumers.
- Ensuring regulatory compliance : International regulations impose strict restrictions on the use of PFAS, and analyses help to verify that products comply with these standards.
- Meeting consumer expectations : In a context where consumers are looking for safer and more natural products, laboratory analyses offer increased transparency.
Analytical techniques used to detect PFAS
Several advanced methods are used to analyze PFAS in cosmetics. These techniques allow for precise and reliable detection, even at trace levels.
Liquid chromatography coupled with mass spectrometry (LC-MS/MS) :
This method is the most common for identifying and quantifying PFAS. It offers high sensitivity and allows the detection of a wide range of PFAS compounds in complex matrices such as cosmetics.
- Example application : Detection of PFAS in mascaras and lipsticks.
Gas chromatography coupled with mass spectrometry (GC-MS) :
Adapted for volatile PFAS, this technique is used for compounds that vaporize easily. It is particularly useful for analyzing aerosols or cosmetic sprays.
- Example of application : Identification of PFAS in spray deodorants.
Fourier transform infrared (FTIR) spectroscopy :
This technique allows for the rapid identification of PFAS in products thanks to their specific chemical signature. Although less precise than LC-MS/MS, it is useful for rapid screening.
Migration tests :
These tests verify whether cosmetic packaging transfers PFAS to the products it contains. They are essential to ensure that packaging materials comply with safety standards, particularly those set by EC Regulation No. 1935/2004.
Importance of standards and certifications in analyses
Laboratories performing these analyses must adhere to strict standards to guarantee the reliability of the results:
- ISO 17025 standard : It establishes the general requirements for the competence of testing laboratories, ensuring accurate and valid results.
- COFRAC accreditation : In France, this certification guarantees that laboratories comply with European and international standards for cosmetic analysis.
- EC Regulation No. 1223/2009 : Specifically applied to cosmetics, it imposes requirements in terms of safety and composition, including restrictions on PFAS.
Challenges related to PFAS analysis
Despite technological advances, PFAS analysis presents several challenges:
- Complexity of matrices : Cosmetics contain a wide variety of ingredients, making it difficult to extract and quantify PFAS.
- Wide diversity of compounds : With more than 10,000 possible PFAS, it is sometimes difficult to accurately identify all the compounds present in a product.
- Cost of analyses : Advanced techniques, such as LC-MS/MS, require expensive equipment and specialized expertise.
YesWeLab's contribution to PFAS analyses
YesWeLab, through its network of partner laboratories, offers comprehensive services for the analysis of PFAS in cosmetics:
- Detection and quantification : Precise identification of PFAS present in cosmetic formulations.
- Migration tests : Verification of the conformity of packaging and materials in contact with cosmetics.
- Regulatory support : Assistance in bringing products into compliance with ISO standards, COFRAC and European directives.
- Technical recommendations : Advice on alternatives to PFAS and reformulation strategies.
6. Alternatives to PFAS in cosmetics
Faced with growing concerns about the health and environmental impacts of PFAS, the cosmetics industry is actively exploring safer alternatives. These substitutes must offer similar performance while meeting sustainability and safety requirements. This section details the available alternatives, their advantages, and the challenges associated with their adoption.
Biodegradable and natural substitutes
Biodegradable and natural alternatives are gaining ground due to their low environmental impact and compatibility with consumer expectations:
- Natural waxes : Derived from plants or bees, these waxes replace PFAS in formulations requiring film-forming properties, such as mascaras and lipsticks.
- Vegetable oil esters : These compounds derived from natural oils offer an alternative to PFAS to improve the texture and stability of products.
- Bio-based polymers : Made from renewable sources such as starch or cellulose, these polymers offer properties similar to those of PFAS in terms of water resistance and texture.
These substitutes, in addition to their safety, are part of an eco-responsible approach, responding to the growing demand for more sustainable products.
PFAS-free synthetic alternatives
For applications requiring advanced technical properties, PFAS-free synthetic compounds are also being developed:
- Biodegradable polymers : They offer a combination of performance and durability, particularly suitable for cosmetic products requiring long-lasting hold.
- Silicone-based compounds : These materials, although they sometimes raise questions about their biodegradability, are a viable solution to replace PFAS in products such as foundations and sunscreens.
- Nanomaterials : When used in a controlled manner, some nanomaterials can mimic the properties of PFAS, particularly for impermeability and texture, while exhibiting better environmental compatibility.
Research and innovation in green chemistry
Green chemistry plays a key role in the transition to alternatives to PFAS. The principles of this discipline aim to design chemical products and processes that reduce or eliminate the use of hazardous substances
- Synthesis of environmentally friendly polymers : Development of synthetic polymers that degrade easily without releasing toxic substances.
- Use of green solvents : Integration of non-toxic and biodegradable solvents into manufacturing processes.
- Innovative technologies : Exploration of new chemical structures capable of replacing PFAS while offering equivalent performance.
Challenges related to the adoption of alternatives
Although the alternatives are promising, their large-scale implementation presents several challenges for the cosmetics industry:
- High costs : Natural or innovative raw materials are often more expensive than traditional PFAS, increasing the final price of products.
- Long-term performance : Some alternatives, particularly biodegradable ones, still need to prove their long-term effectiveness for specific applications such as waterproof products.
- Complex reformulation : Replacing PFAS often requires a complete overhaul of formulations, impacting production processes and time to market.
Examples of successful reformulations
Despite these challenges, several cosmetic brands have already incorporated PFAS alternatives into their products:
- Organic waterproof products : Some brands use plant-based waxes and bio-sourced polymers to achieve water resistance without PFAS.
- Natural long-lasting lipsticks : Formulated with plant oil esters and mineral pigments, these products offer performance comparable to versions containing PFAS.
The role of laboratories in the development of alternatives
Laboratories play a crucial role in validating alternatives and integrating them into cosmetic formulations:
- Performance tests : Evaluation of the hold, texture and stability of PFAS-free formulations.
- Safety testing : Verification of the safety of alternatives for consumers and the environment.
- Support for reformulation : Technical assistance to effectively integrate substitutes into existing formulations.
