The 10 Ingredients We Flag in Every Product We Audit
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Every product that comes through Daily Ritual Lab's audit pipeline is screened against over 1,400 flagged substances drawn from international regulatory databases — the EU's restricted list, EWG's Skin Deep database, Made Safe criteria, and the Scientific Committee on Consumer Safety.
But within that database, ten ingredients appear more often than any others. These are the ones we find in products that claim to be clean, natural, or non-toxic. These are the ones most brands are hoping you will not notice. These are the ones that trigger automatic flags in our system every time they appear.
Here they are — what they are, where they hide, and why we flag them.
01. Synthetic Fragrance
Also known as: Fragrance, Parfum, Perfume, Aroma
Why we flag it: A single INCI entry that legally conceals up to thousands of undisclosed chemical compounds. Under US and EU law, fragrance formulas are protected as trade secrets — meaning a brand can list one word and hide an entire chemistry set behind it. Documented compounds found inside fragrance formulas include phthalates (hormone disruptors), synthetic musks (bioaccumulative), benzene derivatives, and aldehydes — none of which need to be disclosed individually.
Commonly found in: Moisturisers, body washes, shampoos, baby products, cleaning sprays, laundry detergents, air fresheners, yoga mat cleaners, dryer sheets
DRL verdict: Automatic flag. Products containing synthetic fragrance do not pass the DRL purity screen regardless of other ingredients.
02. Parabens
Also known as: Methylparaben, Ethylparaben, Propylparaben, Butylparaben, Isobutylparaben
Why we flag it: Preservatives used to extend shelf life. Parabens are endocrine disruptors — they mimic oestrogen and have been detected in human breast tissue and breast milk. The EU restricts several paraben types and bans others entirely. A 2025 review in Frontiers in Toxicology confirmed that parabens share with phthalates the ability to stimulate cell proliferation in oestrogen-sensitive tissues, raising concern for hormone-related conditions even at low-dose, chronic exposure levels.
Commonly found in: Moisturisers, shampoos, conditioners, sunscreens, makeup, baby products, pharmaceutical topicals
DRL verdict: Automatic flag. All paraben variants are on the DRL restricted list.
03. Phenoxyethanol
Also known as: Phenoxyethanol, Ethylene glycol monophenyl ether, 2-Phenoxyethanol
Why we flag it: A synthetic preservative that replaced parabens in many 'paraben-free' products — marketed as a safer alternative when the evidence is more nuanced. The EU's Scientific Committee on Consumer Safety has classified it as a hazard at certain concentrations, particularly in products applied to the lips, near the mouth, or on broken skin. It is also a known skin sensitiser and has been detected in breast milk.
Commonly found in: Moisturisers, serums, baby wipes, eye creams, sunscreens — frequently appearing in products marketed as 'clean' or 'paraben-free'
DRL verdict: Automatic flag. The paraben-free claim does not override the phenoxyethanol concern.
04. PEG Compounds
Also known as: PEG-40, PEG-100, PEG-6, Polyethylene glycol (followed by any number)
Why we flag it: PEG compounds are petroleum-derived emulsifiers and thickeners. The concern is twofold: they can be contaminated with 1,4-dioxane, a probable human carcinogen, during manufacturing; and they enhance skin penetration — meaning they increase the absorption of everything else in the formula, including other flagged substances. The FDA has no mandatory limit on 1,4-dioxane in cosmetics.
Commonly found in: Shampoos, conditioners, body washes, facial cleansers, sunscreens
DRL verdict: Automatic flag. The penetration-enhancing effect in combination with other ingredients is the primary concern.
05. Sodium Laureth Sulfate (SLES) and Sodium Lauryl Sulfate (SLS)
Also known as: SLES, SLS, Sodium lauryl ether sulfate, Sodium dodecyl sulfate
Why we flag it: Surfactants that create the foam most people associate with effective cleansing. They are highly effective at removing oil and dirt — including the natural oils and ceramides that maintain the skin's moisture barrier. Chronic use strips the barrier, triggers the sebaceous glands to overproduce oil to compensate, and in sensitive individuals causes persistent irritation and contact dermatitis. SLES can also be contaminated with 1,4-dioxane.
Commonly found in: Shampoos, body washes, face washes, bubble baths, toothpaste, dishwashing liquid
DRL verdict: Automatic flag on leave-on products. Flagged on rinse-off products for sensitive skin context.
06. Oxybenzone and Chemical UV Filters
Also known as: Oxybenzone (Benzophenone-3), Octinoxate (Octyl methoxycinnamate), Homosalate, Octisalate, Avobenzone
Why we flag it: Chemical UV filters work by absorbing ultraviolet radiation and converting it to heat inside the skin — meaning they are absorbed into the bloodstream to function. Oxybenzone has been detected in blood, urine, and breast milk within hours of application. Several chemical UV filters are banned in Hawaii and other jurisdictions due to documented reef toxicity. The FDA has stated it cannot confirm the safety of several chemical UV filters and has proposed requiring additional safety testing.
Commonly found in: Sunscreens, moisturisers with SPF, lip balms, foundations with sun protection
DRL verdict: Automatic flag. DRL only passes mineral sunscreens using zinc oxide or titanium dioxide as active UV filters.
07. Formaldehyde and Formaldehyde Releasers
Also known as: DMDM Hydantoin, Imidazolidinyl urea, Diazolidinyl urea, Quaternium-15, Bronopol, 2-Bromo-2-nitropropane-1,3-diol
Why we flag it: Formaldehyde is a known human carcinogen classified by the International Agency for Research on Cancer (IARC). It is rarely listed directly on ingredient labels — instead, these preservative compounds release formaldehyde slowly over time as they break down in the product. This means a product can be genuinely formaldehyde-free at the time of manufacture and release the substance during its shelf life. The EU bans formaldehyde in cosmetics above 0.2%. The US has no such limit.
Commonly found in: Nail products, hair straightening treatments, baby shampoos, body washes, makeup
DRL verdict: Automatic flag on all formaldehyde-releasing preservatives regardless of concentration.
08. Methylisothiazolinone (MIT) and Methylchloroisothiazolinone (CMIT)
Also known as: MI, MIT, Methylisothiazolinone, CMIT, MCI, Kathon CG
Why we flag it: Biocidal preservatives that have been classified as strong contact allergens by the EU's Scientific Committee on Consumer Safety. MIT is banned in leave-on cosmetics in the EU and restricted in rinse-off products. In the US, there are no equivalent restrictions. Exposure has been linked to occupational asthma and contact dermatitis. These compounds appear regularly in baby wipes, wet wipes, and household cleaning products marketed as 'gentle'.
Commonly found in: Wet wipes, baby wipes, shampoos, conditioners, body washes, household cleaners, paint
DRL verdict: Automatic flag. The EU classification as a strong allergen is sufficient for DRL to reject regardless of concentration.
09. Mineral Oil and Petrolatum
Also known as: Mineral oil, Paraffinum liquidum, Petrolatum, White petrolatum, Petroleum jelly, Paraffin
Why we flag it: Petroleum-derived occlusive agents that form a barrier on the skin surface. The primary concern is twofold: the refining process can leave behind polycyclic aromatic hydrocarbons (PAHs), some of which are classified as carcinogenic — the degree of risk depends on the purity grade, which is not disclosed on labels. Additionally, mineral oil and petrolatum do not penetrate the skin — they coat it, creating the appearance of moisture while blocking the absorption of genuinely therapeutic ingredients applied alongside them.
Commonly found in: Moisturisers, body lotions, baby products, lip balms, hair oils, healing ointments, cuticle creams
DRL verdict: Flagged. Cosmetic-grade petrolatum is low-risk but DRL prefers plant-based alternatives with genuine skin benefit.
10. Synthetic Musks
Also known as: Galaxolide, Tonalide, Musk ambrette, Nitromusks, Polycyclic musks
Why we flag it: Synthetic aromatic compounds used to create persistent fragrance in products. Several synthetic musks are bioaccumulative — they accumulate in fatty tissue, have been detected in human blood, breast milk, and cord blood, and have shown endocrine-disrupting activity in laboratory studies. Some nitro musks have been banned in the EU and US due to carcinogenicity concerns. Synthetic musks are typically hidden inside the 'Fragrance' entry — they are rarely individually disclosed.
Commonly found in: Perfumes, body washes, laundry detergents, fabric softeners, dryer sheets — anywhere 'fragrance' is listed
DRL verdict: Automatic flag. Synthetic musks are one of the primary reasons DRL flags synthetic fragrance as a category.
Why These Ten Specifically
These are not the only ingredients we flag — our database covers 1,400+ substances. But these ten are the ones that appear in the highest proportion of the products we reject, in the widest range of product categories, and with the greatest disconnect between their prevalence and consumer awareness.
They appear in products from brands that position themselves as clean. They appear in products certified by programmes that do not screen for all of them. They appear in products your GP, your pharmacist, and your health visitor might recommend without concern.
The regulatory framework does not require their removal. It does not require their disclosure beyond a label listing. It does not require proof that the product using them is safe for daily, skin-contact exposure over years.
The DRL audit does not accept this as sufficient. Every product on Daily Ritual Lab has been screened against all ten of these — and 1,390 more — before it reaches you.
Every product on Daily Ritual Lab passed our full ingredient screen. The audit notes — including which ingredients were checked and why they passed — are published on every product page.
Not a badge. Documentation.