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Contaminated cosmetics.

“Chemicals commonly found in cosmetics, shampoos and lotions, have been found to adversely affect the delicate hormonal balance of adolescent girls. Three classes of chemicals, phenols, phthalates and phytoestrogens can cause early puberty in young girls, potentially setting them up for more serious hormonally related diseases in the future.”

Source: Investigation of Relationships between Urinary Biomarkers of Phytoestrogens, Phthalates, and Phenols and Pubertal Stages in Girls