04/07/2026
This is serious news.
Be sure to read to the end.
A study led by researchers at UC Berkeley and Clinica de Salud del Valle Salinas has demonstrated how taking even a short break from various cosmetics, shampoos, and other personal care products can lead to a substantial drop in the levels of hormone-disrupting chemicals present within the body.
The results from the study were published in the journal Environmental Health Perspectives. Researchers gave 100 Latina teenagers various personal care products that were labeled to be free of common chemicals including phthalates, parabens, triclosan, and oxybenzone. These chemicals are used regularly in almost all conventional personal care products such as cosmetics, soap, sunscreen, shampoo, conditioner, and other hair products, and animal studies have shown that they directly interfere with the body’s endocrine system.
After just a three-day trial with the girls using only the lower-chemical products, urine samples showed a significant drop in the level of chemicals in the body. Methyl and propyl parabens, commonly used as preservatives in cosmetics, dropped 44% and 45%, respectively, metabolites of diethyl phthalate, used often in perfumes, dropped by 27%, and both triclosan and benzophenone-3 fell 36%. The authors of the study were surprised to see an increase in two lesser common parabens, but, being minor, could easily have been caused by accidental contamination or a substitute not listed on the labels.
The researchers noted that cosmetics and personal care products are not well-regulated in this country, and that getting data about health effects from exposure, particularly long-term ones, is difficult. But they say there is growing evidence linking endocrine-disrupting chemicals to neurobehavioral problems, obesity and cancer cell growth.