Environmental Toxins Causing Early Puberty in Both Boys and Girls

Fluoride, which is added to the majority of public water supplies in the United States. Research has shown that animals treated with fluoride had lower levels of circulating melatonin, as reflected by reduced levels of melatonin metabolites in the animals' urine. This reduced level of circulating melatonin was accompanied -- as might be expected -- by an earlier onset of puberty in the fluoride-treated female animals.