It is an accepted fact in the medical community that any effect perchlorate may have on the human body is limited to the thyroid gland.
There are no measureable human health effects from low levels of perchlorate.
There are no measureable health effects when perchlorate is consumed at levels below 245 ppb. Any effects of high levels of perchlorate exposure are fully reversible once exposure declines or stops because perchlorate is not stored in the body. No studies show that environmental levels of perchlorate cause harm to human health.
The 2005 National Academy of Sciences report found that adverse effects of perchlorate exposure are only theoretical and have not been demonstrated in humans, and exposure to perchlorate over months and years must exceed levels above 14,000 ppb before there can be a risk of adverse effects.
To put this in perspective, more than 98% of perchlorate detections in U.S. water systems are below 10 ppb – that’s 24 times lower than the recognized no effect level. At 10 ppb, a human would have to drink almost 740 gallons of water a day before a health risk could be possible.