Library of Harms

ABSTRACT

This 2024 review links three decades of
social media-driven cosmetic growth to cancer, endocrine disruption, neurological disorders, and reproductive toxicity. Chemicals like parabens, phthalates, heavy metals, and formaldehyde produce synergistic toxic effects that individual ingredient testing fails to capture. Most alarmingly, 65% of companies prioritize profit over safety, only 15% of products undergo pre-market carcinogenicity testing, and no consumer category falls under less government oversight than cosmetics.

ABSTRACT

This landmark 2009 Endocrine Society statement identifies EDCs, chemicals in everyday products that disrupt hormonal systems, as a significant public health concern, documenting their effects on reproduction, cancer, thyroid function, metabolism, and cardiovascular health. Key culprits include BPA, phthalates, pesticides and persistent organic pollutants, with reducing exposure during pregnancy and early childhood identified as an urgent priority.

ABSTRACT

This study measured six categories of endocrine-disrupting chemicals (EDCs), including parabens, phthalates, and bisphenols, in the blood of 302 women
of reproductive age. Infertile women had significantly higher concentrations of several EDCs than fertile women, providing direct human evidence linking everyday chemical exposures to female infertility.

ABSTRACT

This study tested 231 cosmetic products in
the U.S. and Canada and found PFAS widely present, with the highest levels in foundations, mascaras, and lip products. Most alarmingly, while more than half of products contained PFAS, less than 8% listed it on the label, leaving consumers with virtually no way of knowing what they were applying to their skin. The researchers concluded that the use of
any PFAS in cosmetics should be seriously questioned, findings significant enough to prompt the introduction of the bipartisan "No PFAS in Cosmetics Act" in the U.S. Senate.

ABSTRACT

This 2025 review finds that microplastics, including those in cosmetics, enter the
body through ingestion, inhalation, and
skin contact, and have been detected in
placentas, breast milk, blood, and major organs. Once inside, they trigger oxidative stress, inflammation, and DNA damage, and have been linked to neurodegeneration including Parkinson's, Alzheimer's, and Huntington's disease. Most concerning, microplastics act as carriers for heavy metals, pollutants, and pathogens, synergistically amplifying their toxic effects.

ABSTRACT

Endocrine-disrupting chemicals (EDCs) are now virtually impossible to avoid, with women particularly vulnerable due to higher use of cosmetic products. This review shows that EDC exposure impairs female fertility through multiple pathways, including accelerated ovarian aging, reduced egg quality, disrupted ovulation, and increased risk of endometriosis. EDCs can cause epigenetic changes that affect not just the exposed individual but potentially future generations.

ABSTRACT

Many everyday personal care products
contain chemicals called parabens and phthalates, which can mimic estrogen in the body. This study found that when women switched to products free of these chemicals, several molecular changes in healthy breast tissue linked to cancer risk were actually reversed. The findings suggest that making simple swaps in personal care products could be a meaningful step in lowering breast cancer risk.

ABSTRACT

This 2025 narrative review links cosmetics
to impaired fertility, respiratory harm, cancer, endocrine disruption, and neurological effects. Chemicals like parabens, phthalates, and heavy metals accumulate in the body through dermal and inhalation exposure, with heightened risk during gestation. The authors conclude that stricter oversight, greater ingredient transparency, and further research are urgently needed, as regulations vary widely across countries and cumulative exposure effects remain poorly understood.

ABSTRACT

This 2021 review by scientists from the NIH, EPA, and Imperial College London finds that PFAS exposure is linked to altered immune and thyroid function, liver disease, lipid and insulin dysregulation, kidney disease, adverse reproductive outcomes and cancer. Most alarmingly, PFAS reliably move across the placenta and enter breast milk, putting infants at heightened risk. The authors warn that risk assessments exist for only a handful of PFAS, while hundreds more found in cosmetics and consumer products remain completely unstudied.

ABSTRACT

PFAS ("forever chemicals") are detected in the blood of most people globally and have been linked to elevated risks of liver, kidney,
testicular, and breast cancer in population studies. They act primarily by disrupting key hormone receptors, lipid metabolism, and epigenetic pathways, with some PFAS also showing estrogenic properties that can stimulate breast cell proliferation. Early-life exposure is of particular concern, as hormonal disruptions may persist across generations.

ABSTRACT

Beauty products containing phthalates,
heavy metals, and other harmful chemicals disproportionately burden women of color, who carry measurably higher chemical body burdens than white women regardless of socioeconomic status. Racialized marketing drives heavier product use among Black, Latina, and Asian American women, with one study finding that frequent douching alone was linked to 150% higher levels of the harmful chemical DEP. The authors call for stronger labeling, safety policies, and reproductive health counseling to address
the "environmental injustice of beauty."