Ingredient
Phenacetin
Phenacetin is flagged for pregnancy, breastfeeding, postpartum, trying to conceive, PCOS and general use. The concern behind the strongest flag is known teratogen and carcinogen concern.
- Acetophenetidin
- 4-Ethoxyacetanilide
- N-(4-Ethoxyphenyl)acetamide
Verdict by profile
Truva checks every ingredient against six profiles. Jump to any of them for the full assessment.
- Strongest verdict
- Not Recommended
- Its verdict for pregnancy, the profile this one is worst in
- Profiles flagged
- 6 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 2 of 5
- Higher means more likely to sting or redden
Phenacetin and pregnancy
Not Recommended
- Known teratogen
- Carcinogen concern
- Absorbed into the body
Phenacetin is a synthetic analgesic compound that was once used in pain medications but has been banned in most countries due to severe health risks. In cosmetics, its presence would be highly unusual and concerning, as it has well-documented toxic effects that can be absorbed through the skin. According to the FDA and international health agencies, phenacetin is a known human carcinogen that causes kidney damage and has been linked to birth defects and fetal toxicity in animal studies. The compound can be absorbed systemically through the skin and crosses the placental barrier, potentially exposing the developing fetus to a proven carcinogen and nephrotoxin. ACOG guidelines recommend avoiding all known carcinogens during pregnancy. There is no safe use of phenacetin during pregnancy. Any cosmetic product containing this ingredient should be avoided entirely and reported to regulatory authorities, as its inclusion would likely violate safety regulations. No reputable cosmetic manufacturer would include this banned substance in their formulations.
Phenacetin and breastfeeding
Not Recommended
- Passes into breast milk
- Infant exposure
- Carcinogen concern
Phenacetin is a banned pharmaceutical ingredient and known human carcinogen that should never be used during breastfeeding. The compound can be absorbed through the skin and, when present in the maternal system, can transfer into breast milk, exposing breastfed infants to a toxic substance. Historical data from when phenacetin was used medicinally shows that it and its metabolites pass into breast milk and can cause methemoglobinemia in infants, a dangerous condition affecting oxygen transport in the blood. The FDA banned phenacetin in 1983 due to its carcinogenic and nephrotoxic properties, and the AAD emphasizes avoiding all known carcinogens during lactation. Any product containing phenacetin should be avoided entirely and reported to regulatory authorities. The presence of this ingredient in a cosmetic product would be highly irregular and potentially illegal, as it poses serious health risks to both mother and infant.
Phenacetin and postpartum
Not Recommended
Phenacetin is a known human carcinogen banned from use in pharmaceuticals and inappropriate for cosmetic use regardless of pregnancy or breastfeeding status. The compound causes kidney damage, increases cancer risk, and has serious systemic toxicity even with topical exposure. Postpartum women should avoid any product containing this ingredient just as all consumers should. The FDA and international regulatory agencies have classified phenacetin as unsafe for human use due to its well-documented carcinogenic and nephrotoxic effects.
Phenacetin and trying to conceive
Not Recommended
- Carcinogen concern
- Fertility effects
Phenacetin is a banned carcinogenic substance that should be avoided by all consumers, including women trying to conceive. The compound's known toxicity to kidneys and other organs, combined with its carcinogenic properties, make it completely unsuitable for use at any time, particularly when planning pregnancy. The systemic absorption of phenacetin and its toxic metabolites could theoretically affect reproductive health and early pregnancy, though most importantly, it should never be used regardless of reproductive status due to its proven cancer-causing properties. Any exposure should be avoided in the preconception period and at all other times.
Phenacetin and PCOS
Not Recommended
- Carcinogen concern
Phenacetin is a banned substance and known human carcinogen that should never be used in cosmetic products, regardless of whether someone has PCOS. The compound offers no benefits for PCOS-related skin concerns and poses serious health risks including kidney damage and cancer. Women with PCOS have no specific additional risks from phenacetin beyond those faced by the general population, but the baseline risk is already unacceptable. The International Agency for Research on Cancer classifies phenacetin as a Group 1 carcinogen, meaning there is conclusive evidence it causes cancer in humans. Any cosmetic product containing phenacetin should be avoided and reported to regulatory authorities. No legitimate skin concern, including those related to PCOS, justifies exposure to this banned carcinogenic substance.
Phenacetin and general use
Not Recommended
- Carcinogen concern
Phenacetin is a synthetic compound that was once used as a pain reliever but has been banned in most countries since the 1980s due to severe health risks. The International Agency for Research on Cancer (IARC) classifies it as a Group 1 carcinogen, meaning it is proven to cause cancer in humans. The FDA banned phenacetin from pharmaceutical products in 1983 after evidence linked it to kidney damage, cancer, and methemoglobinemia. Long-term exposure has been associated with renal cell carcinoma, urothelial cancers, and chronic kidney disease. The compound can be absorbed through the skin, making topical exposure also problematic. No consumer should use any product containing phenacetin. Its presence in a cosmetic formulation would be highly unusual and potentially illegal, as the compound violates safety standards in virtually all regulated markets. Any product found to contain this ingredient should be reported to regulatory authorities immediately.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Phenacetin, each one with its own page here.
Ingredients that raise the same concerns.
Where this came from
Truva summarises published guidance from bodies including ACOG, the FDA, the EU SCCS and the Cosmetic Ingredient Review. It has no access to your medical history and it is not a substitute for your doctor, dermatologist or midwife. These assessments have not been reviewed by a clinician, and nothing here is a diagnosis or a prescription. If you are pregnant, breastfeeding or being treated for PCOS, take the ingredient list to the person looking after you.
Assessment last pulled from the ingredient database on .
One ingredient is the easy case.
A label has thirty of them. Truva reads the whole list at once and answers for the profile you set: pregnancy, breastfeeding, postpartum, trying to conceive, PCOS, or general use.
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