I was in the Rogan studies in NC in the 1980's and the levels of toxins
changed over the course of the years I was tested ( I was in the study with
my first two children so my milk was tested over a period of about 4 years).
I was told this was due to exposures in the winter to heating oils and gas
and being inside ( levels were higher in winter). Also I think they also said
it was due to weight fluxuations.
Barbara Whitehead, IBCLC
Eastern NC
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