Working in a Nail Salon

Pregnancy

MotherToBaby says exposure varies with services, hours, ventilation, and work practices. Nail-salon work can involve inhaled vapors and dust, skin contact, and hand-to-mouth exposure. MotherToBaby says it is not known whether salon work raises miscarriage or birth-defect risk overall; it describes possible miscarriage concerns with high exposure to formaldehyde or organic solvents and possible birth-defect concerns with high exposure to some nail-product chemicals. In the National Birth Defects Prevention Study, Siegel et al. (2022) analyzed 43,106 mothers, of whom 61 reported nail-technician work during early pregnancy, defined as one month before conception through the third month. The study reported associations with seven congenital heart-defect groups, with odds ratios from 2.7 to 3.5; the authors noted small samples and wide confidence intervals. The study did not measure which specific chemicals or work practices caused the signal, so it cannot show that a product or salon job caused a defect. Quach et al. (2015) linked California cosmetology licenses and birth records for births from 1996 to 2009. The authors reported little evidence of higher adverse birth-outcome risk overall, with a small-for-gestational-age association among Vietnamese manicurists compared with other working women (OR 1.39; 95% CI 1.08-1.78). Gallicchio et al. (2009) surveyed 350 cosmetologists and 397 women in other occupations; after adjustment, they found no significant association between occupation and miscarriage, stillbirth, preeclampsia, high blood pressure, or preterm delivery. Herdt-Losavio et al. (2009) linked New York records for 15,003 cosmetologists, 4,246 realtors, and 12,171 population controls; they found a low-birth-weight association compared with realtors (adjusted OR 1.36; 95% CI 1.09-1.70), while SGA and preterm estimates were close to null or imprecise. Halliday-Bell et al. (2009) found increased low birth weight, preterm delivery, and SGA among hairdressers compared with teachers, but cosmetologists had an elevated SGA result and not a clear increase in perinatal death. These mixed results concern broad occupational groups and do not isolate nail chemicals. Attarchi et al. (2012) compared women exposed to a mixed-solvent environment in a pharmaceutical factory with workers in packing units. Spontaneous-abortion frequency was 10.7% in the exposed group and 2.9% in the comparison group. This is not a nail-salon study and cannot establish a miscarriage risk for salon work. A 2024 Utah cross-sectional survey received 90 responses; 17 of the 47 respondents who had ever been pregnant reported at least one miscarriage. The response rate was 9.6%, chemical exposures were not measured, and the authors noted that selection bias could affect the result. The survey did not establish that work exposure caused pregnancy loss.

Breastfeeding

MotherToBaby says the amount of workplace exposure that enters breast milk and the chance of an effect on a nursing child depend on the specific chemical or product, exposure level, and exposure frequency. CDC NIOSH states that solvents can pass into breast milk and advises pregnant or breastfeeding workers to discuss duties involving solvents with a supervisor or workplace safety officer. Fabietti et al. (2004) analyzed 23 human-milk samples collected from a children's hospital milk bank and detected both benzene and toluene. The abstract does not identify the donors as nail-salon workers or report infant outcomes. The evidence reviewed here therefore does not establish effects for all nail-salon products or for infants exposed through milk.

What was tested

Pregnancy evidence includes case-control and registry studies that classified work by job title or license, questionnaires about cosmetology work and pregnancy history, and studies of workers exposed to solvent mixtures in other industries. These studies generally did not measure the individual nail products, exact chemical dose, ventilation, or protective equipment for each pregnant worker. The Siegel et al. study analyzed reported early-pregnancy job titles and included only 61 nail technicians. Breastfeeding evidence includes a 2004 chemical analysis of 23 banked human-milk samples; it did not assess nail-salon work or infant health. The NIOSH and OSHA pages describe workplace hazards and exposure controls rather than pregnancy outcomes from a controlled trial.