Clean Beauty: 12 Toxic Ingredients to Avoid in Your Skincare
Walk into any drugstore and the beauty shelves are lined with products promising miraculous results. But flip those bottles over and read the ingredient list — if you know what to look for, some of them read like a chemistry experiment you'd never want near your face.
"Clean beauty" has become a loaded term, co-opted by marketing departments to mean almost anything. But beneath the buzzword, there's a real and important conversation about which ingredients have legitimate safety concerns, which are well-tolerated by most people, and how to make informed choices for your own skin and health.
Here are 12 ingredients that have raised enough evidence-based red flags to be worth avoiding — along with the science behind each concern.
1. Parabens (Methylparaben, Propylparaben, Butylparaben)
Parabens are preservatives that prevent bacterial growth in cosmetics. They're found in a huge range of products — moisturizers, shampoos, foundations, body washes. The concern: parabens are endocrine disruptors. They mimic estrogen in the body and have been found in breast tumor tissue, though researchers note this doesn't establish causation. The EU has banned certain longer-chain parabens (butyl and propylparaben) in products used on infant skin and has restricted concentrations across all cosmetics. While the science isn't conclusive, many formulators have moved to safer preservative alternatives — making paraben avoidance low-cost and prudent.
Look for on labels: any ingredient ending in "-paraben"
2. Synthetic Fragrance
Listed simply as "fragrance" or "parfum" on ingredient lists, synthetic fragrance is one of the most problematic entries in modern cosmetics. Under the category of "fragrance," a company can hide hundreds of undisclosed chemical compounds — including known allergens, hormone disruptors like phthalates, and neurotoxic musks. It's the leading cause of contact allergies in skincare. The European Union has been progressively restricting more fragrance compounds, requiring disclosure of specific allergens above certain concentrations. For sensitive skin or anyone wanting full ingredient transparency, "fragrance-free" is the standard to look for.
Look for on labels: "fragrance," "parfum," "aroma"
3. Phthalates (DBP, DEHP, DEP)
Phthalates are plasticizers used to make fragrance last longer and to improve texture in nail polishes and hair sprays. Like parabens, they're endocrine disruptors — specifically linked to disruption of male hormone systems in animal studies. DEHP and DBP are banned in the EU for cosmetics. They're still permitted in the US, where they typically hide inside the "fragrance" listing. Another reason to avoid products with fragrance ingredients.
Look for on labels: DBP, DEHP, DEP, "fragrance" (can contain phthalates unlisted)
4. Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES)
These surfactants create the thick, satisfying lather in many cleansers, shampoos, and body washes. They're not carcinogens — that's a myth — but they are effective at stripping the skin barrier. SLS in particular is so irritating that it's used in clinical studies as the standard method for artificially inducing skin barrier disruption. For facial cleansers especially, sulfate-free formulas are gentler and better for maintaining healthy skin barrier function. Those with eczema, rosacea, or sensitive skin should avoid SLS/SLES altogether.
Look for on labels: Sodium Lauryl Sulfate (SLS), Sodium Laureth Sulfate (SLES)
5. Formaldehyde and Formaldehyde-Releasing Preservatives
Formaldehyde is a known human carcinogen. While most cosmetics don't contain it directly, several common preservatives release formaldehyde over time as they break down. These include DMDM Hydantoin, Quaternium-15, Imidazolidinyl Urea, and Diazolidinyl Urea. They're effective at preventing bacterial growth but the slow formaldehyde release has raised legitimate concerns about cumulative exposure, especially in leave-on products. The EU restricts their use and requires disclosure. Safer preservative systems (like phenoxyethanol, ethylhexylglycerin, and plant-based alternatives) provide effective preservation without the formaldehyde concern.
Look for on labels: DMDM Hydantoin, Quaternium-15, Diazolidinyl Urea, Imidazolidinyl Urea
6. Oxybenzone and Octinoxate (Chemical Sunscreen Filters)
These chemical UV filters are widely used in sunscreens because they're highly effective. The concerns are twofold: both have been detected in human blood, urine, and breast milk after topical application at levels that exceed FDA safety thresholds (though long-term health impacts remain unclear), and both are harmful to coral reef ecosystems — which is why Hawaii has banned products containing them. Mineral alternatives (zinc oxide, titanium dioxide) are FDA-approved for safety, effective across both UVA and UVB spectra, and reef-safe.
Look for on labels: Oxybenzone (Benzophenone-3), Octinoxate (Ethylhexyl Methoxycinnamate)
7. Hydroquinone
Hydroquinone is one of the most effective skin-brightening ingredients available — it's the gold standard for treating hyperpigmentation and melasma. However, it comes with significant concerns at higher concentrations: it's a potential carcinogen (the EU has banned it in cosmetics; the FDA is reviewing its over-the-counter status), it can cause ochronosis (permanent skin darkening) with long-term use, and it requires careful supervision. Safer brightening alternatives — niacinamide, vitamin C, azelaic acid, alpha arbutin — can achieve significant results without these risks.
Look for on labels: Hydroquinone
8. Coal Tar Dyes
Used to add color in hair dyes, mascaras, and some cosmetics, coal tar dyes are derived from petroleum. Several are classified as possible or probable carcinogens. They're listed under names like CI 77266 or with FD&C or D&C color designations followed by a number. The FDA allows their use in cosmetics with some restrictions, but the EU has banned many specific coal tar dyes.
Look for on labels: p-Phenylenediamine (in hair dye), "FD&C" or "D&C" followed by a color and number
9. Triclosan
An antibacterial and antifungal agent formerly found in hand soaps, toothpastes, and some cosmetics. The FDA banned triclosan from over-the-counter antiseptic soaps in 2016, citing lack of evidence that it's more effective than regular soap and growing concerns about endocrine disruption and contributing to antibiotic resistance. It can still appear in some cosmetics — check your toothpaste and any product marketed as "antibacterial."
Look for on labels: Triclosan, Microban
10. Talc (Contaminated)
Talc itself isn't inherently dangerous — it's a naturally occurring mineral with a long history in cosmetics. The concern is contamination: talc deposits are often found near asbestos deposits, and some talc-based cosmetics have tested positive for asbestos contamination. Johnson & Johnson faced billions in lawsuits over their baby powder. For face products like foundations and powders, look for brands that use tested, asbestos-free talc, or choose talc-free formulas altogether.
11. Polyethylene Glycols (PEGs)
PEGs are used as thickeners, softeners, and to enhance absorption of other ingredients. They're not directly harmful, but they can be contaminated during manufacturing with ethylene oxide and 1,4-dioxane — both potential carcinogens. PEGs also enhance the penetration of other ingredients, meaning any harmful co-ingredients may get pushed deeper into skin tissue. Well-manufactured PEGs with low contamination levels are generally considered safe, but the contamination risk makes them worth noting.
Look for on labels: PEG followed by a number (PEG-100, PEG-40, etc.)
12. Butylated Hydroxyanisole (BHA) and Butylated Hydroxytoluene (BHT)
Not to be confused with Beta Hydroxy Acid (also called BHA in skincare) — these are synthetic antioxidant preservatives used to prevent products from going rancid. The National Toxicology Program lists BHA as "reasonably anticipated to be a human carcinogen." Both are endocrine disruptors in animal studies. They're widely used in food and cosmetics, but their risk profile warrants seeking alternatives.
Look for on labels: BHA (Butylated Hydroxyanisole), BHT (Butylated Hydroxytoluene)
How to Read an Ingredient List
Ingredients are listed in order of concentration — highest to lowest. The first 5–7 ingredients make up the bulk of the formula. Ingredients below 1% concentration can be listed in any order after that threshold. This means an ingredient near the bottom of a long list is present in tiny amounts and may have minimal impact (positive or negative).
Practical Approach to Clean Beauty
Going "completely clean" overnight — replacing every product — is overwhelming and expensive. A more practical approach:
- Prioritize leave-on products (serums, moisturizers, SPF) over rinse-off products — longer contact time means greater exposure.
- Start with the products you use most frequently and on the largest surface area (body lotion, face moisturizer).
- Use resources like EWG's Skin Deep database or INCI Decoder to check ingredient safety when evaluating new products.
- Focus on removing the highest-concern categories first: synthetic fragrance, parabens, and formaldehyde-releasers.
At PetalGlow, every formula is built on the principle that skincare should perform without compromise — effective, clean, and transparently formulated. Explore our full range at petalglow.vercel.app/products.