It is an accepted fact in the medical community that the principal effect perchlorate has on the human body is limited to the thyroid gland.
Perchlorate is safe at environmental levels, and no study has shown that perchlorate causes adverse effects on human health.
No study has reported that perchlorate causes adverse effects at levels below 245 ppb. Because perchlorate is not stored in the body, effects above this level, if they occur, are temporary and non-adverse – the body adapts naturally.